My Wax Works Beautifully in One Jar Supplier's Glass but Poorly in Another Jar with the Same Diameter — Can Glass Composition or Thickness Matter?
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What is the first test? Measure five jars from each supplier, then a two-by-two: X and Y, each as received and cleaned, three jars per cell, one melt.
Should I change wax for the new jar? No. Your wax already works in X's glass. Fix cleaning, preparation or supplier first.
What does it cost? ₹601.00 in CSI materials with your own jars, wax and oil; ₹3,346.00 with wax and oil bought. See the kit.
Can glass composition or thickness matter? Yes — but test the surface first
Two jars sold as the same size can differ in almost everything that touches the wax: how much glass is in the wall and base, the exact internal diameter and taper, the inner surface finish, the type of glass, and whatever residue or film the jar carries from manufacture, packing and transport. Each of those is commonly cited as a possible contributor to wet spots. A heavier, thicker-walled jar at room temperature has more glass to warm up, and it can draw heat from the wax next to the wall differently from a lighter one; a different glass type can conduct and hold heat differently; a different surface or residue can change how well the setting wax grips. So yes: when your wax works in supplier X's glass and spots in supplier Y's, the glass is a fair suspect.
But of all those differences, the one most often responsible — and the only one you can fix in an afternoon — is what is on the glass, not what the glass is. New jars arrive with dust from cartons and dividers, films from handling, and sometimes residues from the manufacturing line. If supplier X's jars happened to arrive cleaner, or your team handles them differently because they come in a different pack, the "glass difference" is really a surface difference. That is why the first test crosses supplier with cleaning, and why you measure the jars before you pour them. CSI does not publish glass thickness, glass composition or internal diameter for any jar, and no supplier's "same diameter" tells you those things either; your own calipers and scale do.
The test is a two-by-two: jars from X and from Y, each poured both as received and after a controlled isopropyl-alcohol clean, three numbered jars in each cell, from one melt of Premium Coconut Soy Wax CSI 468 with Bergamot Amber at 8%. The worked example assumes an illustrative 180 g fill — 14.4 g of oil and 165.6 g of wax per jar — in your two jars; weigh your own fill line.
| Difference | How it can affect adhesion (commonly described) | How you check it | Cost |
|---|---|---|---|
| Residue or film on the glass | Changes how setting wax grips the wall, often in patches | Cleaned vs as-received cells of the two-by-two | ₹383.00 spray |
| Glass mass (wall and base) | More glass at room temperature can draw heat from wax at the wall differently | Weigh five empty jars from each supplier | ₹0 with your scale |
| Internal diameter and taper | Changes fill height and the wax–glass contact area for the same weight | Measure inside diameter at top and base | ₹0 with a ruler or calipers |
| Wall thickness at the rim | A visible proxy for how much glass the wax meets | Calipers on the rim of five jars | Calipers are not a CSI item |
| Glass type or surface finish | Can change heat flow and grip; not visible by eye | Ask the supplier; then test — you cannot measure it at home | ₹0 to ask |
| Packing and handling | Dividers, cartons, bare hands transfer dust and skin oils | Note how each supplier's jars arrive and are handled | ₹0 |
Step 1: measure both jars before you pour
Take five jars from each supplier at random from their cartons and measure them. You are looking for differences big enough to matter and consistent enough to be real. None of these figures is published for CSI's own jars either — only the outer dimensions on the product pages — so this is a habit worth keeping for every container you use.
| Measurement | How | Supplier X (avg of 5) | Supplier Y (avg of 5) | Example figures (illustrative only) |
|---|---|---|---|---|
| Empty weight | Kitchen or candle scale, lid off | ___ g | ___ g | X 210 g · Y 255 g → Y carries 21.4% more glass |
| Outside diameter | Calipers or ruler at the widest point | ___ cm | ___ cm | Same — that is what "same diameter" means |
| Inside diameter at the rim | Calipers inside the mouth | ___ cm | ___ cm | X 7.6 cm · Y 7.3 cm |
| Inside diameter near the base | Ruler across the inside base | ___ cm | ___ cm | Shows taper if different from the rim |
| Rim wall thickness | Calipers across the rim | ___ mm | ___ mm | Thicker rim suggests a heavier wall |
| Fill height for your fill weight | Pour water to your fill weight, measure depth | ___ cm | ___ cm | X 7.0 cm · Y 7.59 cm for the same volume |
| How they arrive | Cartons, dividers, shrink-wrap, dust | ___ | ___ | Note anything visible on the glass |
The example column shows the arithmetic, not real jars. If supplier Y's jar weighed 255 g against X's 210 g, Y would carry 21.4% more glass for the wax to warm. If Y's inside diameter were 7.3 cm against X's 7.6 cm, the inside cross-section would be π × d² ÷ 4 = 41.85 cm² against 45.36 cm² (-7.7%), so the same fill would stand 7.59 cm tall instead of 7.0 cm — more wall contact, a different cooling column and, possibly, a different wick result. Two jars with the same outside diameter can easily differ like this when one has a thicker wall. Thicker glass and pour temperature and same capacity, different shape take those two differences further.
Step 2: the two-by-two pour
Everything except jar source and cleaning is held still: one wax lot, one oil bottle, one load, one wick from one pack, one measured pour temperature, one cooling row. CSI's product page for CSI 468 states a pour of 58–60°C and a melting point of 50–53°C — keep every cell inside that range, and check both suppliers' guidance on hot pouring. Leave the as-received jars exactly as they came out of the carton: no wiping, handled only by the rim with clean gloves, so you test the jar and not your hands. Bare hands and fingerprints explains why.
If you want a third reference, add three of CSI's Clear Glass Jar with Golden Lid (150 gram) jars filled to their published 150 g — a different vessel, so it does not join the comparison, but it shows how a jar with a page-stated fill and an 85°C hot-pour limit behaves with your wax on the same day. That adds ₹944.00 for a pack of 10 and 434.7 g of wax. Testing every new vessel before buying thousands explains why a small reference set is a habit worth building.
The scoring sheet
Use a labelled house scale and keep it fixed; there is no industry standard. A grid sleeve works on any round jar: one turn is π × your outside diameter. Score the share of visible glass with a confirmed gap — a raking torch along the glass makes a gap flash a sharp sheen — and grade it.
| Jar | Supplier | Cleaned? | Empty weight g | Pour °C | 48 h | 7 d | After cycle | 30 d | Where on the wall? |
|---|---|---|---|---|---|---|---|---|---|
| X-R1…3 | X | No | ___ | ___ | ___ | ___ | ___ | ___ | ___ |
| X-C1…3 | X | Yes | ___ | ___ | ___ | ___ | ___ | ___ | ___ |
| Y-R1…3 | Y | No | ___ | ___ | ___ | ___ | ___ | ___ | ___ |
| Y-C1…3 | Y | Yes | ___ | ___ | ___ | ___ | ___ | ___ | ___ |
| Batch | Wax bag ___ | Oil bottle ___ | X delivery ___ | Y delivery ___ | Room at pour ___ °C |
The "where on the wall" column matters for glass questions. Spots near the base can point at a heavy base drawing heat; a band around the middle can point at the thickest part of a wall or at shape — pull-away around the middle discusses that pattern — and spots that match fingerprints or divider lines point at the surface. Write the rule before pouring: for example, a cell is spotted if two of its three jars grade 2 or higher at 7 days or after the cycle. The cycle step should use your own logged storeroom or courier readings; an example is 8 hours warm and 16 hours at room temperature, three to five times, with the warm phase kept well below CSI 468's stated 50–53°C melting point. What to record lists other useful columns.
The priced test kit
The jars are yours. CSI supplies the constants. Grams follow CSI's convention (oil = W × L) with a 5% pour-loss working allowance on an illustrative 180 g fill.
| Item | Need | Buy | Price | Skip if |
|---|---|---|---|---|
| Your jars, supplier X and Y | 6 of each | From your stock — keep a carton of X | — | — |
| Premium Coconut Soy Wax CSI 468 | 2,086.6 g | 2 × 1 kg + 1 × 500 g | ₹1,625.00 | You hold your production wax lot (better) |
| Bergamot Amber | 181.4 g | 2 × 100 g | ₹1,120.00 | You test your own oil (better) |
| Eco Candle Wicks Thin C1 | 12 + 2 spare | 1 × 20 (10-pack out of stock) | ₹118.00 | You hold your production wick |
| Wick stickers | 12 | 1 × sheet of 40 | ₹100.00 | You hold stickers |
| Isopropyl Alcohol Spray | Six C jars, cleaned identically | 1 × 150 ml | ₹383.00 | You already hold it |
| Round 1, everything bought | ₹3,346.00 | |||
| Round 1 with your own wax and oil | ₹601.00 | |||
| Optional reference: Clear Glass Jar with Golden Lid (150 gram) | 3 jars | 1 × pack of 10 | ₹944.00 | You do not want a third glass |
Round two runs only if supplier Y spots even when cleaned and X does not. It asks whether warmer glass closes the gap: three Y jars warmed to a measured, recorded temperature (an example arm is 35–45°C, never hotter than the pour temperature or the jar's limit, and well below CSI 468's 50–53°C melting point), three Y jars at room temperature and three X jars as the control, all cleaned. It adds 1 × 1 kg + 1 × 500 g of CSI 468 (₹975.00), 1 × 100 g + 2 × 15 g more oil (₹770.04) and wicks (₹118.00) — ₹1,863.04 with your own jars. A jar-warming oven or heat gun and a surface thermometer are not CSI items; use whatever you have and record the reading. Preheating jars and glass thickness and preheating cover the method.
What a cheaper jar with spots really costs
Jar changes are often made for price. Put the saving next to the spotting. In this example — CSI 468 at the 5 kg rate, Bergamot Amber at the 1 kg rate, an Eco Thin C1 at ₹5.90 as the example wick line, and two jar prices that are examples only: X at ₹62.00 and Y at ₹55.00 — the candles cost:
| Jar | Example jar price | Material cost per candle | Example share spotted | Cost per acceptable candle |
|---|---|---|---|---|
| Supplier X (old) | ₹62.00 | ₹251.68 | 0% | ₹251.68 |
| Supplier Y (new) | ₹55.00 | ₹244.68 | 20% | ₹305.85 |
| Supplier Y, cleaned, if cleaning clears it | ₹55.00 | ₹244.68 | your result | add your cleaning labour |
With these example figures, a jar that is ₹7.00 cheaper becomes ₹54.17 dearer per sellable candle once an example 20% of jars spot — before labour, labels and complaints. If the cleaned cells fix Y, the real comparison is ₹7.00 of jar saving against the labour of a cleaning step: ₹520.00 buys a litre of spray, and CSI publishes no jars-per-litre figure, so count how many jars your own litre cleans. Counting jar-cleaning labour as part of the true cost carries the arithmetic further.
The decision rule
Read the four cells at 7 days and after the cycle. Stop at the first line that is true.
| If this is true | It means | Do or buy |
|---|---|---|
| X spots too, cleaned or not | Not the jar change | Nothing jar-related. Process diagnosis — oil, cooling, temperature. |
| Y spots as received, clean once cleaned | A residue or handling film | Add a fixed cleaning step for Y; clean commercially without residue. |
| Both suppliers spot as received, clean once cleaned | Your old process hid a surface issue | Clean every jar, whatever the supplier. |
| Y spots even when cleaned; X clean | The glass itself — mass, wall, shape or surface | Round 2 glass-warming arm on Y; ask Y about glass type and wall. |
| Warmed Y is clean | Y needs a different preparation | Decide whether the warming labour costs less than the jar saving. |
| Warmed Y still spots | Y's glass does not suit this wax and process | Return to X, or qualify Y with a full new-container validation before any wax change. |
Record the result against the jar, not just the wax: "Supplier Y, cleaned, approved with CSI 468 lot ___ and Bergamot Amber 8%, date ___". When a supplier changes again — even with identical dimensions — a small production test as policy is the cheapest insurance you can buy.
The CSI products in this test
| Pack | Price | Per ml |
|---|---|---|
| 150 ml spray | ₹383.00 | ₹2.55 per ml |
| 1 litre | ₹520.00 | ₹0.52 per ml |
| Pack | Price | Per kg | Candles at 165.6 g wax |
|---|---|---|---|
| 500 g | ₹325.00 | ₹650.00 | 3.02 |
| 1 kg | ₹650.00 | ₹650.00 | 6.04 |
| 5 kg | ₹3,185.00 | ₹637.00 | 30.19 |
| 10 kg | ₹6,370.00 | ₹637.00 | 60.39 |
| Pack | Price | Per gram | Candles at 14.4 g |
|---|---|---|---|
| 15 g | ₹105.02 | ₹7.00 | 1.04 |
| 50 g | ₹280.00 | ₹5.60 | 3.47 |
| 100 g | ₹560.00 | ₹5.60 | 6.94 |
| 500 g | ₹2,718.00 | ₹5.44 | 34.72 |
| 1 kg | ₹5,437.00 | ₹5.44 | 69.44 |
| Pack | Price | Per jar |
|---|---|---|
| Pack of 10 | ₹944.00 | ₹94.40 |
| Pack of 20 | ₹1,888.00 | ₹94.40 |
Where to go next
This post owns the question of whether two jars of the same stated size really differ. The jar-supplier change post owns what to retest when you switch; the supplier-change policy post owns making that a standing rule; the thicker-glass post owns pour temperature in heavier jars; invisible oil or dust on the glass owns the cleaning question in depth. The section hub covers fragrance, if your two-by-two clears the jars.
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles. A jar and wax supplier could treat this as a chance to sell a new jar or a new wax. This page uses your own two jars, asks us only for constants and a cleaning spray, keeps the wax that already works, and says plainly that CSI publishes no glass thickness, composition or internal diameter for any jar and no adhesion data for any wax.
Oil prices are CSI live pricing, pulled 24 September 2026, stock re-checked 7 October 2026. Luxury Soy Wax Chunks, CSI 464 and CSI 468 are CSI live pricing, re-checked 7 October 2026; Natural Soy Pearl was re-checked 1 October 2026. Jar, Isopropyl Alcohol Spray and jar-range prices are CSI live pricing, pulled 7 October 2026; wicks were re-checked 4 October 2026, including the Eco Thin C1 10-pack being out of stock. Every candle split, kit total, per-jar and per-candle figure on this page is arithmetic on those listed prices, shown to two decimals so you can check it.
Jar counts per arm, photo checkpoints, the scoring scale, glass-warming and temperature-cycle settings, fill weights for jars without a published fill, and the pour-loss allowance are labelled working practices or examples, not industry standards — no industry figure exists for an acceptable amount of wet spotting. The 180 g fill, the jar weights (210 g / 255 g), internal diameters (7.6 / 7.3 cm), jar prices (₹62.00 / ₹55.00) and the 20% spotted share are illustrative examples only. For help building a test kit, bulk quotes, GST invoicing, MSDS or IFRA documents, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- My Unscented Soy Candle Has Excellent Glass Adhesion but the Scented Version Develops Wet Spots — Can Fragrance Oil Change Wax Contraction?
- I Changed Jar Suppliers and Suddenly Developed Wet Spots — Should I Validate the New Container Before Changing My Wax Formulation?
- Should Candle Jar Supplier Changes Trigger a Small Production Test Even if Dimensions Remain Identical?
- My New Jar Has Thicker Glass and the Wax Cools Differently — Should I Retest Pouring Temperature?
- My New Jar Has the Same Capacity but a Different Shape — Why Might Glass Adhesion Change?
- My Dark Black Candle Shows Every Tiny Adhesion Defect — Should I Change the Wax or Reconsider Using Clear Glass for This SKU?
- My Jar Feels Clean but the Wax Refuses to Adhere Consistently — Could Invisible Oil or Dust on the Glass Be Responsible?
- Should Different Glass Thicknesses Require Different Jar-Preheating or Pouring Conditions?
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 — Eco Candle Wicks, Premium Candle Wicking Needle and Bamboo Wick Holder. They are general product reviews, not assessments of the guidance set out here. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on the three reviews Judge.me recorded as verified — Monika Deep, Subhankar Roy and Sneha Tamang; the reviews from Ashwini, LJ and Lalitha Jagan are published but not recorded as verified, and carry no badge.
Figures pulled 24 September – 7 October 2026: Oils — CSI live pricing, pulled 24 September 2026, stock re-checked 7 October 2026: Bergamot Amber Fragrance Oil ₹105.02 / 15 g, ₹280.00 / 50 g, ₹560.00 / 100 g, ₹2,718.00 / 500 g, ₹5,437.00 / 1 kg. Waxes — CSI live pricing, re-checked 7 October 2026 (Natural Soy Pearl re-checked 1 October 2026): Premium Coconut Soy Wax CSI 468 ₹325.00 / 500 g, ₹650.00 / 1 kg, ₹3,185.00 / 5 kg, ₹6,370.00 / 10 kg. Jars and jar-care items — CSI live pricing, pulled 7 October 2026: Clear Glass Jar with Golden Lid (150 gram) ₹944.00 / 10, ₹1,888.00 / 20; Isopropyl Alcohol Spray ₹383.00 / 150 ml, ₹520.00 / 1 litre. Wicks re-checked 4 October 2026: Eco Candle Wicks Thin C1 ₹118.00 / 20, ₹295.00 / 50, ₹590.00 / 100, ₹2,950.00 / 500, ₹5,900.00 / 1,000 (₹5.90 each; 10-pack out of stock); Thick C2 ₹94.40 / 10 … ₹9,440.00 / 1,000 (₹9.44 each); Cotton Braided Wicks Ready Made ₹12.00 each at every pack; wick stickers ₹100.00 / 40. Wick Centering Device ₹118.00 / 5; Candle Making Weighing Scale ₹354.00; Pen Thermometer ₹354.00 (measures wax, not glass).
Non-price figures and assumptions: Load convention: fragrance load is a share of the finished candle (oil = W × L; wax = W × (1 − L)). Worked example: the reader's own two jars at an illustrative 180 g fill, CSI 468 and Bergamot Amber at 8% as constants. Working practices: 3 jars per cell, alternating pour order, 5% pour loss, photo checkpoints at pour day, 48 hours, 7 days, after a temperature cycle and 30 days; example cycle 8 hours warm / 16 hours room for 3–5 cycles; example glass-warming arm 35–45°C, measured and recorded, never above the pour temperature or the jar's limit. Example measurements and prices (illustrative only): empty weights 210 g and 255 g; internal diameters 7.6 and 7.3 cm (areas 45.36 and 41.85 cm²); fill height 7.0 cm vs 7.59 cm; jar prices ₹62.00 and ₹55.00; 20% spotted. Production-rate costs use CSI 468 at the 5 kg rate, the oil at the 1 kg rate and Eco Thin C1 at ₹5.90 as the example wick line. What CSI's product pages state (quoted as claims, not CSI test results): Luxury Soy Wax Chunks — fragrance load up to 13%, fragrance addition 80–90°C, pour 75–80°C in the spec table (the step list also shows 70–80°C), stir 2 minutes, cure at least 48 hours, ideally 1–2 weeks, and "excellent adhesion to glass and container surfaces reduces wet spots and pull-away"; Luxury Soy Wax CSI 464 — fragrance load up to 10%, an 80–90°C melt/pour working range, "excellent glass adhesion", single-pour, low frosting; Premium Coconut Soy Wax CSI 468 — melting point 50–53°C, pour 58–60°C, fragrance load up to 13%, "formulated for excellent glass adhesion and a one-pour finish"; Natural Soy Pearl — no fragrance ceiling, temperature, cure or adhesion statement published. All three adhesion claims are the same claim, so they rank nothing. Clear Glass Jar with Golden Lid (150 gram) — fill approximately 150 g, "safe for hot pour up to 85°C"; glass thickness not published. CSI publishes no adhesion, wet-spot, shrinkage or contraction data for any wax, oil, dye or jar; no glass thickness or internal diameter for any jar; no dye dose per kg; no wick size for any jar; and no industry acceptance threshold for wet spots exists — every acceptance line on this page is a labelled house standard the reader sets. Wet spots are described as commonly understood in candle making: areas where wax has separated from the glass, leaving a thin air gap that looks darker through clear glass. Material costs exclude labour, packaging, freight and GST. Diwali 2026 falls on Sunday 8 November.