Can I Use Any Thick Glass Jar for Candle Making or Does Candle Glass Need Specific Heat Resistance?

Can I Use Any Thick Glass Jar for Candle Making or Does Candle Glass Need Specific Heat Resistance?

 

Apothecary thick-walled jar from ₹212.40 Screen materials ₹949.80 Borosilicate 600 g: confirm glass type
Thick glass jars · measure, then burn
Find out whether the thick jar you like is even enough to hold a burning candle, before you build a product on it.
★★★★★
"Good product"
Biny AbrahamVerified buyer · Feb 2026
Black Glass Jar with Black Lid (150 gram) (Deliveries Starting 5th Dec)
★★★★★
"The jars were of good quality"
Soumili GopeVerified buyer · Mar 2026
Clear Glass Jar with Golden Lid (150 gram)
★★★★★
"Very good"
Tina Lynette Lazaro MogantiVerified buyer · Dec 2025
Black Matte Glass Jar
★★★★☆
"For candle making and new beginner this is very helpful, i came to know about them from Sosa candle, Sonal guide us in youtube about product materials and everything she suggested this, I trusted her and gave a try, and it is authentic product and other materials too. Sometimes it happens that all materials didnt reach me, they take the responsibility and send me. The team is co-operative in nature and friendly too. If i ordered liquid colors or fragrance that too packed so well that there is no leakage also my packaged item where misplaced by delivery boy i guess (i didn't remember properly) they sent it again they took all that responsibility that gains the trust. Only i felt little costly during checkout when its kg amount calculated (ho sakhe todha kam kar do,haha). Overall had great experience with them. Thankyou so much 👍😊"
JinalOct 2025
Ceramic Jar for Candle Making
★★★★☆
"Good quality .... if possible delivery date would be try little bit quick please"
Subhankar RoyVerified buyer · Sep 2024
Eco Candle Wicks
★★★★★
"all the materials are high quality and ultimate fragrance range"
Arminder KaurVerified buyer · Mar 2026
Premium Coconut Soy Wax CSI 468 (Flakes Form) For Container Candles
★★★★★
"Good product"
Biny AbrahamVerified buyer · Feb 2026
Black Glass Jar with Black Lid (150 gram) (Deliveries Starting 5th Dec)
★★★★★
"The jars were of good quality"
Soumili GopeVerified buyer · Mar 2026
Clear Glass Jar with Golden Lid (150 gram)
★★★★★
"Very good"
Tina Lynette Lazaro MogantiVerified buyer · Dec 2025
Black Matte Glass Jar
★★★★☆
"For candle making and new beginner this is very helpful, i came to know about them from Sosa candle, Sonal guide us in youtube about product materials and everything she suggested this, I trusted her and gave a try, and it is authentic product and other materials too. Sometimes it happens that all materials didnt reach me, they take the responsibility and send me. The team is co-operative in nature and friendly too. If i ordered liquid colors or fragrance that too packed so well that there is no leakage also my packaged item where misplaced by delivery boy i guess (i didn't remember properly) they sent it again they took all that responsibility that gains the trust. Only i felt little costly during checkout when its kg amount calculated (ho sakhe todha kam kar do,haha). Overall had great experience with them. Thankyou so much 👍😊"
JinalOct 2025
Ceramic Jar for Candle Making
★★★★☆
"Good quality .... if possible delivery date would be try little bit quick please"
Subhankar RoyVerified buyer · Sep 2024
Eco Candle Wicks
★★★★★
"all the materials are high quality and ultimate fragrance range"
Arminder KaurVerified buyer · Mar 2026
Premium Coconut Soy Wax CSI 468 (Flakes Form) For Container Candles
Reviews collected and published through Judge.me on candlemakingsuppliesindia.store. They are general reviews of the products named on each card, not assessments of the advice set out below. Wording is unedited.
Shop Apothecary jars — from ₹212.40 Ask about a thick jar on WhatsApp
✓ Wording quoted as written, verified 26 September 2026 ✓ No jar called "safe" on our word ✓ Raw materials only — CSI does not sell finished candles
CSI Jar & Container Guides · Glass Safety
Thick glass feels safe in the hand. But thickness is a measurement, heat resistance is a property of the glass, and cracks usually come from heat that is uneven. Here is how to tell them apart, and how to test the thick jar you like.
3 ≠ 1
thickness, heat resistance and thermal-shock resistance are three different things · CSI live pricing, September 2026
Quick answers — read this first
Can I use any thick glass jar for candles? No, not on thickness alone. Thickness is a dimension; it does not tell you how the glass copes with a flame inside it. A thick jar can pass a burn test and a thick jar can fail one, often at a spot where it is thick in one place and thin in another.

Does candle glass need a specific heat resistance? It needs to survive your pour and a full burn down to the stop line, repeatedly, without cracking or changing. No figure printed on a listing proves that on its own, and most listings give none: of CSI's 60 glass listings, 7 state a figure, and it is a pour limit ("hot-pour up to 85°C").

Is borosilicate better than ordinary glass? Borosilicate is generally more resistant to thermal shock than the soda-lime glass candle jars are commonly made of. That is a general property of the glass type, not a promise about any one jar, and you usually cannot tell which glass a jar is by looking.

What should I do with a thick jar I like? Measure its walls in four places and its base, then burn three candles in it down to a stop line with about 1 cm of wax left, supervised. Evenness and the test result matter more than the millimetres.
The short answer
Three different things: thickness (millimetres of glass), heat resistance (coping with steady heat) and thermal-shock resistance (coping with sudden or uneven temperature). Sellers blur them; your test separates them.
The risk in thick glass: unevenness. A jar with a thick band and thin sides, or a heavy base under thin walls, heats and cools unevenly, and uneven thickness is one of the common causes linked to cracks.
The glass type: borosilicate is generally more thermal-shock resistant than soda-lime; a title that says "borosilicate" is not a test, and CSI's own 600 g listing says borosilicate in the title and "clear glass" in the description.
The test: measure walls at four points and the base, then burn three candles to the stop line. For a jar you already own, the materials are about ₹949.80.
Shop: Apothecary Dome Lid jar · Clear 150 g jar · Shot Glass Jar · Borosilicate 600 g · Wick Centering Device · all glass jars
In this guide
Thickness is a dimension, not a heat rating Three 7 × 8 cm jars in cross-section, drawn to scale (1 cm = 25 px). Wall and base figures are illustrative, not CSI listing data. Grey = glass; light fill = wax, shown late in the burn; the flame sits where heat is most concentrated. A Thin, even walls 2 mm · base 5 mm B Thick, even walls 5 mm · base 8 mm C Thick in places walls 3 to 7 mm · base 15 mm 7 mm band 3 mm HEAT RESISTANCE a property of the glass type and its making, not of thickness alone HEAT RESISTANCE same glass, same answer: thickness does not raise it HEAT RESISTANCE same as A and B if the glass is the same THERMAL SHOCK thin glass heats through quickly; thin rims chip more easily THERMAL SHOCK a thicker wall can hold a bigger inside-outside difference when heated fast THERMAL SHOCK thick and thin parts heat and cool at different rates: stress collects WATCH IN THE TEST rim chips; outside temperature; flame near the wall WATCH IN THE TEST the final third; the base as the pool nears it WATCH IN THE TEST the band and the base in the final third; every jar, not just one General tendencies, not certainties. A thick, even jar can still fail and a thin one can pass: the burn test decides.
Three jars with the same outside size, drawn to scale with illustrative wall figures. B is thicker than A everywhere and is not automatically the better candle jar; C looks the most substantial and is the one to test hardest, because its glass changes thickness where the heat is. Measure your own jar and let a burn to the stop line decide.
"thick-walled" · 85°C pour wording · from ₹212.40
Apothecary Dome Lid jar: the thick look, with a stated pour limit
150 g · pack of 10 ₹944.00
Clear Glass Jar with Golden Lid: a clear reference jar to compare against
WhatsApp +91 7397976926
Order screen materials for a jar you already own
Straight answer
Can I Use Any Thick Glass Jar for Candle Making or Does Candle Glass Need Specific Heat Resistance?
Not any thick glass jar, and not because it lacks a special rating, but because thickness is the wrong thing to judge by. Three properties matter and they are different: thickness, which is a measurement; heat resistance, which is how a glass type copes with steady heat; and thermal-shock resistance, which is how a jar copes with sudden or uneven temperature differences, the kind a flame near one wall or a hot pool over a cold base creates. Thick glass can work against the third: a thicker wall can carry a bigger temperature difference between its inside and outside, and a jar that is thick in some places and thin in others heats and cools unevenly. Borosilicate glass is generally more thermal-shock resistant than the soda-lime glass candle jars commonly use, but you rarely know which you have. So candle glass does not need a number on a label; it needs to pass your test. Measure the walls at four points and the base, reject chipped or cracked jars, pour within the jar's stated limit where there is one, and burn three candles under supervision to a stop line with about 1 cm of wax left. The jar that passes is suitable for that formula. The thickness is just a note in your log.
One line: thickness is a measurement, evenness is a risk factor, and only a burn to the stop line tells you whether a thick jar can hold a candle.
Testing a thick jar you already own? You still need the candle. One kilogram of Luxury Soy Wax CSI 464, a 50 g bottle of Jasmine, a pack of 10 Eco C2 wicks and a Wick Centering Device come to ₹949.80: enough for four 150 g screen candles at 8%, in stock on 26 September 2026.
Order screen materials — ₹949.80

Three properties sellers blur together

"Thick", "heat resistant" and "won't crack" are three different claims. A listing that makes one has not made the other two.

When someone asks whether a jar is "thick enough", they usually mean "will it crack?". Thickness is only one input to that, and not the most important one. Separate the three before you judge any jar, including ours.

Three properties · general descriptions, hedged; not CSI test data
What each one is, how you would know, and what listings usually say
Property What it means How you find out What listings usually say
Thickness Millimetres of glass in the wall and base; a dimension, like height Callipers at the rim; inside depth against outside height for the base Rarely a figure. CSI pages say "thick-walled" on most of the 150 gram lidded jars and the Apothecary jar, with no millimetres
Heat resistance How the glass copes with steady heat: hot wax, a warm pool, a warm jar Mostly from the glass type and how it was made, which you rarely know "Heat-resistant", "withstand high heat", "safe burning": heat or safe-burning words with no figure on 27 of CSI's 60 glass listings
Thermal-shock resistance How the jar copes with sudden or uneven temperature: hot pool over a cool base, a flame near one wall, a cold draught, cold stone under a hot jar Only by testing the jar in use: pour, burn to the stop line, cool, repeat Not stated as a property on CSI listings. The borosilicate 250 g page says the glass "resists heat and cracking" (out of stock)
Evenness (the hidden fourth) Whether thickness is the same around and down the jar Callipers at four points; looking through the wall at a light for distortion bands; the base Not stated on any CSI listing

Notice where the risk sits. Cracks in candle jars are more commonly linked to the temperature being different in different parts of the jar, or changing fast, than to the temperature itself. That is thermal shock, and evenness has more to do with it than thickness. It is also why the only numeric heat figure on CSI's glass listings, "Safe for hot-pour up to 85°C" on seven of them, is narrow: it describes one pour, not the uneven heating of a long burn.

Mistake: reading "thick-walled" on a product page, ours included, as "won't crack". What it actually says: the walls look substantial. It does not say how even they are, what glass it is, or whether anyone burned a candle to the bottom of one. Fix: measure the walls and base yourself, and treat the page's wording as a reason to shortlist the jar, not a reason to skip the burn test. How to read every heat claim on a listing is in the glass-suitability hub.

Why thick glass can be the harder test

Glass does not move heat quickly. The thicker it is, the longer one face can stay much hotter than the other.

Glass conducts heat slowly. When hot wax or a flame warms the inside surface of a jar, the outside surface lags behind, and the glass between them is stretched on one side relative to the other. In general terms, the thicker the wall, the bigger that inside-outside difference can become when heating is fast, and the more stress it can carry while it lasts. A thin wall warms through quickly and the difference stays smaller. That is the reason "thicker is safer" is not a rule, and why some very heavy decorative glass is a harder candle test than a plain, even jar.

The bigger issue is unevenness. A jar that is 3 mm in one place and 7 mm in another, like jar C in the diagram, is really two jars joined together: the thin part warms and cools faster than the thick part next to it, and the boundary between them takes the strain. Embossed logos, cut facets, a thick decorative band, a lip that is heavier on one side, or a heavy base under thin walls all create boundaries like that. Uneven wall or base thickness is one of the common causes linked to jars cracking, alongside thermal shock from cold jars and draughts, flames touching the glass, and chips or flaws.

None of this means thick glass fails. Many thick, even jars burn down cleanly, and a well-made heavy jar can be an excellent candle container. It means thickness does not answer the question. The specific case of very heavy jars and heavy bases, and why "heavier is automatically safer" is wrong, is in Is Heavier Glass Automatically Safer for Candle Making or Can Thick Glass Still Fail From Thermal Stress?; a jar with a very thick base and thin side walls gets its own test schedule in the thick-base, thin-wall guide.

What this means for your burn test
On a thick or uneven jar, pay most attention to the places where thickness changes and to the final third, when the pool gets close to a thick base. Log the outside glass temperature at the same spots each session with a non-contact thermometer if you have one (CSI does not sell one). Never touch the glass to judge it. If one point reads far hotter than the rest of the jar, or than the same point on a sister jar, stop and find out why before you continue.

Soda-lime and borosilicate, in plain terms

Most everyday glass containers are soda-lime glass: the common, affordable glass of jars and bottles, and commonly the glass of candle jars. Borosilicate glass, the type associated with laboratory glassware and some ovenware, expands less when heated, which is why it is generally more resistant to thermal shock. Those are general statements about the two families of glass, and there is variation within each depending on how a piece is made.

Three practical cautions. First, you usually cannot tell the two apart by eye, weight or feel, so the glass type rests on what the seller says. Second, "borosilicate" in a product title is a claim like any other: CSI's own Borosilicate Glass Jar 600 gram listing has the word in its title while its description says only "Premium quality clear glass (high-clarity, heat-resistant)", and our 300 g listing has a description copied from the 600 g one. Ask before you pay a premium for the word. Third, even confirmed borosilicate does not protect a jar from a chip, a wick that drifts until the flame touches the wall, or an uneven base. Borosilicate moves the odds; the test still decides.

Soda-lime is not a problem to be avoided. Apart from the three borosilicate listings, CSI's glass listings do not name a glass type at all, and plenty of soda-lime jars burn down cleanly when they are even, undamaged and well wicked. Choose the glass type as one factor, then test.

Argued against our own interest: we would rather you did not pay extra for a jar because of a word in its title. If the glass type matters to your product story, get it confirmed in writing by the seller, and still run the burn test. What a supplier's "candle-safe" claim covers and what to ask in writing is in the supplier-claims guide.

The thick jars people actually try

Most "can I use this thick jar?" questions are about glass that was made for something else.

Thick glass is easy to find in Indian homes and markets: storage jars from the kitchen, heavy tumblers, glass vases for Diwali decoration, pickle and jam jars, cut-glass bowls. Each has a typical thickness pattern, and that pattern tells you where the test will be hardest.

Repurposed and decorative thick glass · judgement from common causes, not CSI test data
Typical thickness pattern, the risk to watch, and our verdict for a first product
Type of jar Typical pattern What to watch Verdict
Heavy tumbler, rocks or whisky glass Thick, heavy base under thinner sides The final third, when the pool nears the heavy base Screen it; watch the base boundary
Cut-glass or embossed bowl or tumbler Thick and thin facets round the wall Every facet line at pool height Hardest test; many makers avoid it for a first product
Kitchen storage jar, straight sides Often even walls, moderate base Rim chips from use; old scratches Good candidate if new and undamaged
Pickle, jam or salsa jar with a lug or screw neck Even walls, narrower neck and threads Heat trapped under the shoulder; wick reach Screen it; wick for the narrow opening
Glass vase Can be thin and tall, or thick with a heavy foot Flame far below the rim, heat trapped; thin rims Screen only if the pool can burn to the edge
Bottle cut down at home Cut edge with no finishing The cut edge itself, which may carry cracks you cannot see Avoid for products you sell
Second-hand or used jar of any kind Unknown history Scratches and chips are crack origins Reject if any chip or crack; otherwise screen

We sell one of these categories ourselves: the 200ml Salsa lug-cap jar, whose page calls it "upcycled" and says the glass "withstands the heat of hot wax without cracking or warping", with no figure and no dimensions. It is ₹40.12 a jar in 5s and ₹29.50 a jar in 50s. Treat it the same way as a pickle jar from your kitchen: a candidate that has to pass the burn test in your formula.

Measuring thickness and evenness at home

You do not need a laboratory to find out whether a thick jar is even. You need callipers (a vernier or digital calliper, not sold by CSI), a steady light, a notebook and ten minutes per jar. Measure at least three jars of the kind you want to use, because variation between jars is part of the answer.

1
Inspect before you measure. Clean the jar and hold it against a window or white light. Reject it outright if there is any chip, crack, line or star mark, on the rim or the base. Measuring a damaged jar is wasted time; why chips are always rejects is in the chipped-rim guide.
2
Measure the rim wall at four points. With callipers across the rim, take the wall thickness at 12, 3, 6 and 9 o'clock. Write all four down. If the largest is much bigger than the smallest, the jar is lopsided, and the thin side is where the flame is most likely to overheat the glass if the wick drifts.
3
Look through the wall for bands. Rotate the jar slowly in front of a line on a page or a window frame. Straight lines that bend or ripple as you turn show changes in thickness you cannot measure at the rim: embossing, a thick band, a heavier side. Mark them with a marker on the outside.
4
Find the base thickness. Measure the outside height. Then stand a ruler inside to the floor of the jar and measure the inside depth. The difference is roughly the base thickness. Compare it with the rim wall: a base three or four times thicker than the walls is the thick-base, thin-wall pattern to watch.
5
Weigh the empty jar. Weigh each jar on your scale and note it. Weight tells you how much glass there is, not how evenly it is spread; two jars of the same weight can have very different walls. A jar much heavier or lighter than its sisters is a sign that the batch varies.
6
Pick the jars for the burn test. Choose three jars to burn and include the thinnest-walled or most uneven one you measured, not just the best. A test that only uses the best jar tells you about the best jar.
7
Burn to the stop line and compare. Pour within the jar's stated limit if it has one, burn under supervision to about 1 cm of wax, and log the outside temperature at your marked spots if you have a non-contact thermometer. Compare the three jars. The full screen, with pass and fail rules, is in the hub.
Mistake: checking whether a jar "can take the heat" by pouring boiling water into it, warming it on a stove or putting it in the freezer. Why it misleads: those are sudden, all-over temperature changes unlike anything normal candle use produces, and a jar can fail them and still burn cleanly, or pass them and crack in the final third. It is also an easy way to cut yourself. Fix: test with a candle, under supervision, the way your customer will use it.

Writing your own "heat resistance" spec

If no listing gives you a number worth using, write down the one thing that matters: what the jar has survived.

"Does candle glass need specific heat resistance?" has a practical answer: yes, and you write it. Instead of a temperature you cannot verify, record what the jar has been proven to do in your formula. That record is what you reorder against, what you compare the next batch with, and what you point to if a customer asks.

A one-jar spec card · worked example layout, our judgement
What to record once a thick jar has passed, so the next order can be checked against it
Field Example entry Why it matters
Jar and batch Apothecary Dome Lid 500 gm, order date, carton label Batches differ; a pass belongs to a batch
Glass type "Not stated by seller" or the seller's written confirmation Stops a title word becoming an assumption
Rim wall, 4 points For example 3.8 / 4.0 / 4.1 / 4.6 mm (illustrative) A new batch outside your range gets re-screened
Base Outside height minus inside depth, in mm The thick-base pattern shows here
Stated limit e.g. "Safe for hot-pour up to 85°C" (page wording), or none Your pour ceiling, if there is one
Formula Wax, oil and load, wick, pour temperature The pass is for this formula only
Result 3 of 3 burned to 1 cm stop line; no cracks; no finish change; hottest spot and reading The only line that says "suitable"

Change the wax, the wick, the load or the jar batch, and the spec card tells you what you are no longer sure of. A larger wick puts more heat into any jar; a higher fragrance load can change how a candle burns (whether load affects jar heat is its own question). The full minimum test list a brand should complete before selling a new container is in the small-brand safety programme.

Thick-walled options in CSI's range, and their caveats

These are the CSI listings people shortlist when they want a thick or substantial jar, with what each page says and what it leaves out. None is "safe" because we sell it; each is a candidate for your measuring and your burn test. Stock was checked on 26 September 2026.

1
Clear glass · 500 g / 700 g · page: "thick-walled", "Safe for hot-pour up to 85°C"
Apothecary Glass Candle Jar with Dome Lid
If you want a visibly heavy, thick-walled jar, this is the CSI listing that says so in words: "thick-walled vintage apothecary-inspired vessel", with a curved silhouette and broad base, and "Safe for hot-pour up to 85°C". That is two statements: a description of the glass and a pour limit. Neither is a burn rating, and "thick-walled" gives no millimetres. Measure the wall at the rim in four places and check the base depth before you trust the evenness the photos suggest. Limitation: the page gives one set of dimensions (about 10.8 cm high without the lid, about 10 cm rim and base) for two sizes, so confirm which size they describe.
Pack Price Per jar What it covers
500 gm (single jar) ₹212.40 ₹212.40 one jar to measure and burn; four make a screen
700 gm (single jar) ₹250.00 ₹250.00 the same, ₹37.60 more per jar
Sold singly, so four jars are a full screen. Buy the Apothecary jar
2
Clear glass · 150 g · product data: "thick-walled", "Safe for hot pour up to 85°C"
Clear Glass Jar with Golden Lid (150 gram)
The smaller jar with the same two statements: the page's product data calls it "Premium thick-walled clear glass" and states "Safe for hot pour up to 85°C". It is 8 cm high and 7 cm across the outside, about 6.5 cm at the base. For a thickness question it is a useful reference jar: clear, so you can see wall variation against a light; lidded; and in packs of 10, so a screen does not mean buying one-offs. Limitation: its data describes it as both "curved" and "straight-sided", and no figure is internal.
Pack Price Per jar What it covers
Pack of 10 ₹944.00 ₹94.40 one screen: measure 10, pour 4, burn 3
Pack of 20 ₹1,888.00 ₹94.40 screen plus a wick bracket, or a second batch
₹94.40 a jar at either pack size. Buy the pack of 10
3
Clear glass · 130 g · tumbler shape · "sturdy design", no figure
Shot Glass Jar (Pack of 6) 130gram
The CSI listing nearest to the "thick tumbler" people ask about: a straight glass, listed at height 8 cm and "Diameter 6cm", with the wording "Their sturdy design ensures safe, stylish burning". Sturdy is a word about handling, not heat, and "safe" is the page's word, not ours. Measure the base: tumbler-style glass often has a heavy base under thinner sides, and that is the pattern to watch in the final third. Two contradictions to settle first: the title says Pack of 6, the handle and description say five, and the diameter is not stated as inside or outside. Ask us on WhatsApp how many jars a pack holds before you work out a per-jar cost.
Pack Price Per jar What it covers
One pack ₹288.00 ₹48.00 if 6, ₹57.60 if 5 one screen: measure all, pour 4, burn 3
Per jar depends on the pack count: ₹9.60 apart. View the Shot Glass Jar
4
Clear glass · 600 g · title says borosilicate
Borosilicate Glass Jar 600 gram fill capacity with golden lid
If you want the glass type that is generally more resistant to thermal shock, this is the only in-stock CSI listing with "borosilicate" in the title on 26 September 2026; the 250 g and 300 g borosilicate listings are out of stock. But the description says only "Premium quality clear glass (high-clarity, heat-resistant)", with no dimensions and no figure. We will not tell you the glass type our own description does not state: confirm it on WhatsApp. Even confirmed borosilicate is screened like any other jar, because evenness, chips and the wick still decide the result.
Pack Price Per jar What it covers
Single jar ₹200.00 ₹200.00 one jar; four make a screen, and a 600 g fill needs its own wick test
Confirm the glass before you pay for the word. View the 600 g jar
5
Ceramic · 180 g · "thick ceramic walls ensure safe burning"
Ceramic Jar for Candle Making
Included because people who want "thick" often end up at ceramic. Read its page with the same care: it says "The thick ceramic walls ensure safe burning, as they retain and diffuse heat evenly". That is our listing's claim, and we would not rely on it without a burn test any more than on a glass jar's. Ceramic is opaque, so you cannot watch the flame's distance from the wall or see a hairline crack forming during the burn, and "retain heat" also means the outside can stay hot after you blow the candle out. The page gives a 180 g fill weight and no dimensions; its title says plain ceramic while the description says "Ceramic Jar with Blue Speckles".
Pack Price Per jar What it covers
Single jar ₹129.80 ₹129.80 one jar; four make a screen
Opaque: inspect inside and out after every burn. View the ceramic jar

A free jar still costs a test

A pickle jar from your kitchen costs nothing. Finding out whether it can hold a candle does not.

The materials for a screen are the same whatever jar you test: four 150 g candles at 8% need 552 g of wax and 48 g of oil, and each needs a wick, centred. With Luxury Soy Wax CSI 464 (whose page states up to 10% load) and Jasmine (whose page states "Recommended load up to 10% soy"), that is ₹949.80 of consumables, with 2 g of oil left in the 50 g bottle. Jars are the only thing that changes.

Worked example · CSI live pricing, September 2026 · materials only, excluding labour, freight, packaging and GST
What a 4-candle screen costs in different jars
Jar under test Jars Consumables Screen total Per screen candle
A thick jar you already own nothing extra ₹949.80 ₹949.80 ₹134.66 (plus centering device)
Clear Glass Jar with Golden Lid (150 gram), pack of 10 ₹944.00 ₹949.80 ₹1,893.80 ₹229.06
Shot Glass Jar 130gram, one pack ₹288.00 ₹949.80 ₹1,237.80 confirm pack count first
200ml Salsa clear, 5 Pcs ₹200.60 ₹949.80 ₹1,150.40 fill weight to measure first

On the clear jar, the jars are 49.8% of the screen; on a jar you own, they are nothing, and the test costs the same wax, oil and wicks. For the 600 g jar the candle is four times the size: three burned 600 g candles at 8% need 1,656 g of wax and 144 g of oil, so four jars, two 1 kg packs of wax and a 100 g plus a 50 g bottle of oil (6 g left) come to ₹2,592.80 before wicks, which need their own bracket at that width; pouring the fourth jar as an unburned reference needs a further 552 g of wax and 48 g of oil. Every figure excludes labour, freight, packaging and GST.

The honest conclusion: if you already own a thick jar you like, testing it is cheaper than buying ours. We would rather you screened the jar you want than bought a jar you do not.

Your thick jar passed three burn-downs? Diwali is on 8 November 2026. Send us the jar size, wick and load and we will quote wax, wicks and oil for 200 candles with a GST invoice and a dispatch date from Pune.
Get a Diwali materials quote
The CSI principle
Thickness is a measurement. Suitability is a result.
Separate the three properties, measure evenness, never trust a title word over a test, and write down what each jar has survived in your formula. A thick jar that passes is suitable; a thick jar that has not been tested is only heavy.
"Ask how even the glass is before you ask how thick it is, and ask what it has survived before you ask either."
— CandleMakingSuppliesIndia
Why trust this guide

CandleMakingSuppliesIndia sells the jars, wax, wicks, oils and tools named here, and does not sell finished candles. This guide tells you that our "thick-walled" wording has no millimetres behind it, that our 600 g "borosilicate" listing does not say borosilicate in its description, that our ceramic jar's safety wording is a claim we would not rely on untested, and that testing a jar you already own is cheaper than buying ours.

Every price, pack size and stock status was verified against the live CSI store on 26 September 2026; the out-of-stock 250 g and 300 g borosilicate jars are flagged and not offered. Heat and thickness wording is quoted from the product pages as written.

The descriptions of glass behaviour here are general tendencies, hedged, not CSI test data: CSI publishes no thermal-shock, burn-down or breakage test data. The thickness figures in the diagram and spec card are illustrative. For bulk pricing, GST invoicing, MSDS and IFRA documentation on request, WhatsApp +91 7397976926.

Frequently asked questions

Is thicker glass better for candle jars?
Not automatically. Thickness is a dimension, not a heat rating. A thick, even jar can burn down cleanly; a jar that is thick in places and thin in others, or has a heavy base under thin walls, heats unevenly and is the harder test. Measure evenness and burn three candles to the stop line.
Does candle glass need to be heat resistant?
It needs to survive your pour and full burns down to the stop line, repeatedly, without cracking or changing. Most listings give no figure that proves this; of CSI's 60 glass listings, 7 state "hot-pour up to 85°C", which is a pour limit. Your burn test is the evidence.
What is the difference between heat resistant and thermal shock resistant glass?
Heat resistance is coping with steady heat. Thermal-shock resistance is coping with sudden or uneven temperature differences, such as a hot pool over a cool base or a flame near one wall. Candle-jar cracks are more commonly linked to the second.
Is borosilicate glass better for candles than normal glass?
Borosilicate is generally more resistant to thermal shock than soda-lime glass. That is a general property, not a promise for any one jar, and you usually cannot confirm the glass type by eye. Get it confirmed by the seller and still burn-test the jar.
Can I use a thick whisky glass or pickle jar for candles?
Possibly. Tumblers often have heavy bases under thinner sides; pickle jars have necks that trap heat. Check for chips, measure the walls and base, and burn three of the same kind to the stop line under supervision before selling any.
How do I measure the thickness of a glass jar?
Use callipers across the rim at four points, look through the wall at a straight line to spot thickness bands, and find the base by subtracting the inside depth from the outside height. Measure at least three jars, because the variation matters as much as the number.
Test the thick jar you like
Wax, oil, wicks and a centering device for four screen candles: ₹949.80.
Measure the walls at four points and the base, pour four candles, burn three to a stop line with about 1 cm of wax left, and write down what the jar survived. That line on your spec card is the only heat rating that counts.
Buy CSI 464 — ₹507.40 per kg Order screen materials on WhatsApp
Continue the read — Glass Safety, Heat & Breakage
Editorial standards & sources
About this guide: part of CSI's glass safety, heat and breakage cluster. It separates thickness, heat resistance and thermal-shock resistance, explains why uneven thickness is the real risk in thick glass, sets out soda-lime and borosilicate in general terms, reviews the thick jars people repurpose, and gives a home measuring method and a spec card.

Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on the product pages named on each card — Black Glass Jar with Black Lid (150 gram) (Deliveries Starting 5th Dec), Black Matte Glass Jar, Ceramic Jar for Candle Making, Clear Glass Jar with Golden Lid (150 gram), Eco Candle Wicks, Premium Coconut Soy Wax CSI 468 (Flakes Form) For Container Candles. They are general product reviews, not assessments of the container advice on this page. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on reviews Judge.me recorded as verified — Biny Abraham, Soumili Gope, Tina Lynette Lazaro Moganti, Subhankar Roy, Arminder Kaur. The reviews from Jinal are published but not recorded as verified, and carry no badge. Reviews below five stars are included as published, not filtered out.

Figures verified 26 September 2026, CSI live pricing: Apothecary Glass Candle Jar with Dome Lid 500 gm ₹212.40, 700 gm ₹250.00; Clear Glass Jar with Golden Lid (150 gram) pack of 10 ₹944.00 (₹94.40 each), pack of 20 ₹1,888.00 (₹94.40 each); Shot Glass Jar (Pack of 6) 130gram ₹288.00 (₹48.00 each if 6, ₹57.60 if 5); Borosilicate Glass Jar 600 gram ₹200.00; 250 g and 300 g borosilicate out of stock; Ceramic Jar for Candle Making ₹129.80; 200ml Salsa clear 5 Pcs ₹200.60 (₹40.12 each), 50 Pcs ₹1,475.00 (₹29.50 each); Luxury Soy Wax CSI 464 1 kg ₹507.40, 500 g ₹260.00; Jasmine Fragrance Oil 50 g ₹230.00, 100 g ₹430.00; Eco Candle Wicks C2 10 ₹94.40; Wick Centering Device (Pack of 5) ₹118.00. Per 150 g screen candle: wax ₹70.02, oil ₹55.20.

Non-price figures: worked example 150 g candle at 8% on total weight (12 g oil, 138 g wax); four screen candles use 552 g of wax and 48 g of oil. Heat-wording counts from CSI's 60 glass listings (7 with "hot-pour up to 85°C"). Wall and base thicknesses in the diagram and spec card (2 to 15 mm) are illustrative, not listing data; no CSI listing states a wall or base thickness. The 1 cm stop line is common practice. Glass behaviour (soda-lime, borosilicate, thermal shock, uneven thickness) is described as general tendency. CSI publishes no thermal-shock, burn-down or breakage test data.
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