How to Maintain Consistency Between Large Soy Wax Candle Batches
Share
What tolerances should a candle batch be held to? Our working figures: wax ±1 g on a 200 g fill, oil ±0.5% of the batch target, add temperature within the grade's published window and ±2°C of your own target inside it, and pour temperature ±3°C from first jar to last. The Luxury Soy Wax Chunks page gives 80–90°C for adding fragrance and a 75–80°C pour; those are the outer walls, your target sits inside them.
How many candles should I test from each batch? Three burn tests plus one retained sample per 100 — four candles, ₹742.03 of materials at ₹185.51 a candle, or ₹7.42 spread across the batch. That is 4.0% of a ₹18,550.80 batch to avoid shipping all of it wrong.
How long should I keep a retained sample? Six months, labelled with the batch code, sealed and stored cool. It is the only way to answer “was the last batch different, or is the customer wrong?” The retained jar from batch A is what you burn beside batch B when someone says the scent has changed.
What actually drifts between one large batch and the next
A hundred-jar batch is not a fifty-jar batch done twice. It runs longer, so the wax has more time to cool between the first jar and the last; it uses more than one pack of wax and more than one bottle of oil, so it can straddle two lots of material; and it is poured by a person who is more tired at jar 90 than at jar 10. Those three things — time, lots and fatigue — account for most of what makers describe as “the wax has changed”.
The honest starting point is that some variation is not a fault. Soy is an agricultural product and two packs are not laboratory twins; ambient temperature in an Indian workshop swings 15°C between a February morning and a May afternoon; a jar that has been sitting in a hot delivery carton pours differently from one that has been on a shelf. A batch system does not eliminate variation. It records it, bounds it, and makes the day it steps outside the bound visible immediately instead of six weeks later in a customer message.
| Source | How it shows up in the candle | What catches it | Cost of catching it |
|---|---|---|---|
| Pour temperature falling across a long run | First jars smooth, last jars with rough or sunken tops | Pour temperature logged for the first and last jar of every sub-lot | One thermometer reading, twice a batch |
| A new wax pack opened mid-batch | Surface finish or adhesion changes halfway through the run | Pack letter written on the batch card; one pack finished before the next is opened | A marker pen |
| A new oil bottle opened mid-batch | Throw changes between jars that should be identical | Bottle number on the card, and the batch split into sub-lots by bottle | Nothing, if you record it |
| Load calculated differently | 8% of wax weight one week, 8% of finished candle weight the next — a real difference | Load written as a percentage of wax weight, to two decimals, on every card | Nothing |
| Ambient temperature | Frosting, wet spots and set time change with the season | Room temperature recorded at pour; drift over 5°C treated as a variable | A second thermometer, ₹354.00 |
| Jar temperature | Adhesion and wet spots differ across jars from the same pour | Jars stored and used at room temperature, never straight from a hot carton | A shelf |
| Stir time and vigour | Uneven fragrance distribution within a batch | Timed two-minute stir, same tool every run | CSI Pro Mixer ₹349.00, or a timer and a bamboo stick |
| The person pouring | Fill weights spread, wicks off centre late in the run | Fill weight checked every tenth jar; a break at jar 50 | Ten seconds, ten times |
The batch record card: sixteen fields, one side of a page
A batch card is not paperwork for its own sake. It is the only thing that converts “the last one smelled stronger” into a comparison. Keep it to one side of a page so it actually gets filled in, and fill it in during the batch rather than from memory afterwards — a card written at the end of the day is a reconstruction, and reconstructions are confidently wrong. Paper on a clipboard beside the melter works better than a phone with wax on it; transcribe it into a spreadsheet the same evening if you want it searchable.
| Field | Example | Why it is on the card |
|---|---|---|
| Batch code | CHK-2609-A | Grade, month, run. Every jar, every label and every retained sample points back to this |
| Date and start time | 22 September 2026, 09:40 | Lets you line a batch up against the weather and against the person who poured it |
| Wax grade | Luxury Soy Wax Chunks | The one field nobody forgets and everybody assumes |
| Wax pack letter and arrival date | Pack C, arrived 12 September 2026 | The single most useful field on the card when something changes for no reason |
| Wax weight melted | 20,000 g | The denominator for the load. Weigh it, do not count packs |
| Fragrance oil and bottle number | Orchard Pear, bottle 2 of 5 | Oils move between bottles as surely as wax moves between packs |
| Oil weight | 1,600 g | Weighed, never measured by volume. Oils differ in density |
| Load as % of wax weight | 8.00% | Two decimals, and the words “of wax weight”, so next month's you knows which convention was used |
| Dye and dose | Candle Dye Liquid, 12 drops per kg | Colour is the first thing a returning customer notices |
| Add temperature | 85°C | Inside the page window of 80–90°C for this grade, and inside your own ±2°C |
| Stir time | 2 minutes, timed | The Luxury Soy Wax Chunks page asks for two full minutes of slow stirring |
| Pour temperature, first and last jar of each sub-lot | 78°C / 76°C / 77°C / 75°C | Four numbers that explain most surface complaints |
| Ambient temperature at pour | 31°C | The variable you do not control and must therefore record |
| Jar and wick, with pack references | 200 ml salsa jar, pack 2; Eco C1, pack A | Containers and wicks drift between packs as well |
| Jars poured, jars scrapped, sub-lots | 100 poured, 3 scrapped, 3 sub-lots | Your scrap rate is a quality measure. Ten scrapped jars is ₹1,855.08 of materials |
| QC results and retained sample location | 24 h pass, day 14 pass; retained jar CHK-2609-A on shelf 3 | Closes the loop. A card without a result is a diary entry |
Three parts, no more: grade · year and month · run letter. CHK-2609-A is Luxury Soy Wax Chunks, September 2026, first run of the month. Write it on the batch card, on the base label of every jar in the run, and on the retained sample. A Candle Care Stickers Roll is ₹413.00 for 500 (₹0.83 each), so coding a jar costs less than a rupee.
Resist the urge to encode more. A code that carries the oil, the jar, the wick and the operator becomes unreadable and stops being written. The card holds the detail; the code only has to find the card.
Seven numbers, and the band each one lives in
Every process control comes down to the same question: how far is this allowed to move before I stop and fix it? Answer it in advance, in writing, and the batch either passes or it does not. Answer it in the moment and you will always find a reason to carry on pouring. The bands below are CSI's working practice for soy container candles — they are a starting point tight enough to matter and loose enough to hit in a real workshop, not laboratory limits.
| Variable | Target | Tolerance | Where the outer limit comes from | If it is out |
|---|---|---|---|---|
| Wax per jar | 200 g | ±1 g (0.5%) | Your own fill weight, measured once per jar type | Re-weigh. Never top up by eye — that jar is now a different candle |
| Oil per batch | 1,600 g for 100 jars | ±8 g (0.5%) | Your load calculation | Recalculate the actual load and write it on the card. Do not average it away |
| Fragrance load | 8.00% of wax weight | ±0.04 percentage points | The grade's stated ceiling — 13% for Luxury Soy Wax Chunks and CSI 468, 10% for CSI 464 | Never round upward toward the ceiling to fix a weighing error |
| Add temperature | 85°C | ±2°C | The Luxury Soy Wax Chunks page: add fragrance at 80–90°C | Reheat into the window before adding. Do not add to wax that has fallen below it |
| Pour temperature | 78°C | ±3°C first jar to last | The same page: pour at 75–80°C | Stop, reheat, restart as a new sub-lot and record it |
| Ambient at pour | Recorded, not controlled | Drift under 5°C between batches | Your workshop | Treat a bigger swing as a variable: expect surface differences and note them before the customer does |
| Cure before judging | 14 days | Judge at day 14, never earlier | The Luxury Soy Wax Chunks page: cure at least 48 hours, ideally one to two weeks | Hold the batch. A batch judged at 48 hours has not been judged |
Two of those deserve a sentence more. The load convention is the most common invisible difference between two batches that look identical on paper: CSI product pages state the load as a percentage of wax weight, so 20 kg of wax at 8% takes 1,600 g of oil, and the finished 21.6 kg of candle is about 7.4% oil by total weight. Both numbers are defensible; only one of them is what your supplier's page means. Write “of wax weight” on the card and the ambiguity never costs you a batch. And cure is a tolerance, not a nicety — the same page that asks for 48 hours minimum says one to two weeks ideally, and 14 to 21 days is standard practice for soy container candles. Judging a batch early does not give you an early answer; it gives you a wrong one.
Lot tracking: knowing which pack and which bottle made which candle
Lot tracking sounds industrial and is mostly a discipline about opening things. The rule: finish one pack before you open the next, and write the pack's letter on the batch card. If a batch has to straddle two packs, split it into sub-lots at the pack boundary and record which jars came from which. Do the same with fragrance bottles — a 100-jar batch at 1,600 g of oil will cross a bottle boundary if you are buying in 500 g sizes, and that boundary is exactly where “the throw changed” lives.
Record whatever identifier is printed on the pack you receive. If there is none, create your own on arrival — a letter and the date, written on the bag in permanent marker before it goes on the shelf. It does not matter that the code is yours rather than the manufacturer's; it matters that two candles made from the same material carry the same reference. This is also why the receiving check and the batch card belong to the same system: the arrival code on the bag is what the batch card points at.
Colourants deserve the same treatment. One of our customers writes that the dyes “work with all kinds of waxes” and another that a little gives “light to dark depending upon the amount of dye you add” — which is exactly why the dose belongs on the card in drops or grams per kilogram rather than as “a squeeze”. The same applies to micas: record the shade and the batch you bought it in, because a colour difference between two production runs is the single most visible inconsistency a customer can spot on a shelf.
The quality set: three burned, one retained, per hundred
A quality system that never removes candles from the batch is not a quality system; it is an opinion. The working rule here is four candles per hundred: three pulled at random across the sub-lots and burned at day 14, and one labelled and shelved as a retained sample. At ₹185.51 of materials a candle — ₹119.80 of Luxury Soy Wax Chunks, ₹59.81 of Orchard Pear at 8% of wax weight, and a ₹5.90 Eco C1 wick — that is ₹742.03 against a batch carrying ₹18,550.80 of materials. Four per cent, to know rather than hope.
| Checkpoint | When | What you measure | Pass looks like | If it fails |
|---|---|---|---|---|
| Melt and add | During the pour | Wax weight, oil weight, load, add temperature, stir time | All inside the tolerance band, written on the card | Correct before pouring. A recorded correction is fine; an unrecorded one is not |
| Pour log | First and last jar of each sub-lot | Pour temperature | Within ±3°C across the run | Split the sub-lot and note the boundary |
| First look | 2 hours after pour | Surface, wick upright and centred | Even top, wick straight | Re-centre while still soft. Record it as rework, not as nothing |
| Next morning | 24 hours | Surface, filled jar weight on 5 jars | No sink holes, weights within ±2 g | Heat gun the tops and record the rework rate. A rework rate that climbs is a process signal |
| Day 3 | 72 hours | Adhesion at the glass, frosting, wet spots | Whatever is normal for your grade and jar — photographed | Note it against ambient temperature on the card before you blame the wax |
| Burn test | Day 14 | 3 jars of 100: melt pool at 3 hours, flame, soot, throw | Pool reaching the wall by about 3 hours with no flags | Hold the batch. Do not dispatch a batch that failed its own burn test |
| Retained sample | Day 14 | 1 jar labelled with the batch code, sealed, stored cool | On the shelf for six months | — |
| Release | Day 14 to 21 | Card complete, QC results recorded, batch signed off | Signed | An unsigned card means the batch is not released, whatever the calendar says |
The retained sample is the part most workshops skip and the part that pays for itself first. Six months later, when a repeat customer says the scent is weaker than the candle they bought in September, you do not have to argue from memory. You take the retained jar from that batch, burn it beside a jar from the current one in the same room on the same evening, and you have an answer. Sometimes the answer is that the customer is right and something moved; more often it is that the customer's flat in October is a different room from their flat in March. Either way, you know.
Change control: one variable per batch, re-qualified before it ships
Every workshop changes things — a new grade, a bigger jar, a different wick, a supplier's new oil, a melter that holds temperature better. The discipline is not to stop changing; it is to change one thing at a time, on purpose, with the change written on the card before the batch starts. A batch with two changes in it teaches you nothing whichever way it turns out, and you will spend the next three batches trying to unpick which one did what.
| Change | Why it is riskier than it looks | Re-qualify with | Ship when |
|---|---|---|---|
| New wax pack, same grade | Packs are not laboratory twins | 3 candles at day 14 against the retained sample from the last batch | No difference you can name in surface, pool or throw |
| New wax grade | Ceilings, add and pour temperatures all move — CSI 464 tops out at 10%, Luxury Soy Wax Chunks and CSI 468 at 13% | A full 3-candle burn at day 14, plus a check that your load is inside the new ceiling | Two cure-and-burn cycles, not one |
| New fragrance bottle, same oil | Bottles are lots too | 1 candle at day 14, compared against the retained sample | Same day, if it matches |
| New fragrance oil | Different oils behave differently in the same wax | 3 candles at day 14, and check the oil page's stated usage range against the wax ceiling — the lower figure governs | After a full cure and two burns |
| Load change | The one change that is tempting to make mid-batch | 3 candles at the new load, day 14 | Never mid-batch. Always as its own batch |
| New wick | Changes the pool, and the pool changes the throw | 3 candles per wick size, day 14, pool measured at 3 hours | When the smallest wick that gives a full pool is identified |
| New jar | Diameter changes wick behaviour; glass thickness changes set | 3 candles at day 14 with the wick re-checked | After the wick is re-qualified, not before |
| New melter or pouring vessel | Changes how fast the wax cools across a run | One batch with pour temperatures logged at every sub-lot | When the first-to-last spread is inside ±3°C |
The Indian year: the variables you record rather than control
Most process-control writing assumes a room with a thermostat. An Indian candle workshop is usually a room with a fan, and that changes the job: several of the seven variables above are not things you set, they are things you observe and allow for. Ambient temperature at pour is the obvious one. A batch poured at 26°C in January and a batch poured at 39°C in May will not set at the same rate, will not frost the same way and will not release from the jar wall identically — with the same wax, the same oil and the same pour temperature.
Monsoon adds humidity to the list, and the practical consequence is about materials rather than the pour: an open wax pack in a Mumbai or Kolkata July takes on surface moisture, which shows up as spitting when you melt and poorer adhesion at the glass. Since a hundred-jar batch opens 20 kg of wax, this is a batch-level problem, not a jar-level one. Seal packs after every use, keep them raised off the floor, and note the season on the card so that a July batch is compared with other July batches before it is compared with a December one.
Then there are the festival weeks themselves. Production pressure is a real variable: batches poured at 11 pm on a deadline drift more than batches poured on a Tuesday morning, because the pour temperature is watched less closely and the fill weights spread. If your card shows a scrap rate of 1% in September and 6% in the third week of October, that is not the wax. It is the calendar, and the fix is a bigger buffer in the plan rather than a different grade. With Diwali on 8 November 2026 and a 14 to 21 day cure, festive batches want to be poured by about mid-October — which means the last batch in which you can safely change anything is the one you are pouring now.
| Season | What moves | What to record | What to expect in the candle |
|---|---|---|---|
| Cool, dry — November to February | Fast set, low ambient | Ambient at pour; any heating in the room | Crisper tops, more frosting risk on some grades, quicker turnaround |
| Hot, dry — March to June | Ambient over 35°C, wax caking in the pack | Ambient, pack condition, whether the wax was chiselled or scooped | Slower set, softer candles in storage, more wet spots if jars are warm |
| Monsoon — June to September | Humidity, open packs taking on moisture | Season on the card; whether the pack had been opened before | Spitting on melt, adhesion complaints; compare only with other monsoon batches |
| Festival run — September to November | Production pressure, late pours, more sub-lots | Time of day, operator, scrap rate | A scrap rate that climbs is a scheduling problem, not a materials one |
What the system costs, and what one uncontrolled batch costs
Process control feels expensive because its costs are visible and its benefits are invisible — you never see the batch you did not have to scrap. So put both sides on the same page. The recurring cost is the quality set: four candles per hundred, ₹742.03, or ₹7.42 a candle. The one-off cost is instruments: a Pen Thermometer at ₹354.00, a CSI Pro Mixer at ₹349.00 for a repeatable stir, a roll of Candle Care Stickers at ₹413.00 for 500 batch labels and a Silicon Measuring Beaker 250 ML at ₹600.00 — ₹1,716.00 together, which is ₹1.72 a candle across a thousand candles and nothing at all after that.
A second thermometer is worth the ₹354.00: one lives in the melt and one reads the room, and ₹708.00 for the pair removes the temptation to guess the ambient. If your batches are big enough that the melt sits waiting, a Mini Electric Wax Melter at ₹2,360.00 holds temperature far more steadily than a double boiler on a gas ring, and a melt that holds its temperature is the single easiest way to pull the first-to-last pour spread inside ±3°C. A Isopropyl Alcohol Spray at ₹383.00 and a Wick Centering Device at ₹118.00 remove two more sources of jar-to-jar variation for very little. A hot air gun is useful for reworking tops; stock on ours is currently down to a single unit, so check before you plan round it.
Against that: one uncontrolled 100-jar batch carries ₹18,550.80 of materials before jars, labels, packaging or your time, and 20 kg of wax alone is ₹11,998.00 at the 10 kg pack price with ₹7,476.00 of oil beside it. You do not need to scrap the whole batch for the arithmetic to work — ten jars is ₹1,855.08, which is more than twice what the quality set costs. And the loss that does not appear in any of these figures is the repeat customer who quietly does not come back because the second candle was not the first one.
One last honest note, against our own interest: none of this requires you to buy a different wax. If your batches are drifting, the first three things to fix are free — write the card, weigh the melt before calculating the oil, and log the pour temperature at the first and last jar of each sub-lot. Do those for three batches before you change a single material. Most consistency problems that arrive in our WhatsApp are solved by the card rather than by the catalogue, and we would rather tell you that than sell you a grade you did not need.
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, so the convenient conclusion to this page would be that inconsistent batches need better wax. Usually they do not. The first three fixes here cost nothing — a written batch card, weighing the melt before calculating the oil, and logging pour temperature at the first and last jar of each sub-lot — and we would rather you ran those for three batches than bought a new grade. The four-candle quality set removes candles from your saleable stock on purpose, which reduces what you sell and is still the right call.
Every price on this page is from live CSI stock in September 2026 and the linked product pages are authoritative. Working figures are quoted from those pages: the Luxury Soy Wax Chunks page gives melting to approximately 80–85°C, fragrance added at 80–90°C with two full minutes of slow stirring, a 75–80°C pour, a cure of at least 48 hours and ideally one to two weeks, and a fragrance load of up to 13% of total wax weight; Luxury Soy Wax CSI 464 states up to 10% and gives 80–90°C as the working range for melting and pouring; Premium Coconut Soy CSI 468 states up to 13%, a melting point of 50–53°C and a 58–60°C pour. Eco Soy CSI 400 does not publish a fragrance ceiling and we say so rather than guess. Hot Air Gun stock is limited at the time of writing. The batch card, the seven tolerance bands, the batch code scheme, the four-candle quality set, the six-month retention period, the change-control rules and the seasonal notes are CSI's working practice and worksheet design — they are not laboratory data, and no test results, melt points or customer counts have been invented for this page.
WhatsApp +91 7397976926 for bulk pricing, GST invoicing, MSDS and IFRA documentation, stock depth on a grade before you commit a production season to it, or to send a batch card and a pour log for a second opinion on what is moving between your runs.
Frequently asked questions
- How to Use CSI's Soy Wax for Smooth, Crack-Free Candles
- Why Does a Candle Need a 14-Day Cure? Complete Science-Backed Guide to Candle Curing for Indian Candle Makers - Powered by CandleMakingSuppliesIndia (CSI) Luxury Soy Wax and IFRA Certified Fragrance Oils
- Best Temperature for Adding Fragrance Oil to Soy Wax
- How Long Should Soy Wax Cool Before Pouring
- How to Compare Two Fragrance Oils Using a Controlled Burn Test
- How to Test Hot Throw Before Launching a Candle Fragrance
- Why Is My Soy Wax Frosting? The Honest Truth Indian Candle Makers Are Never Told
- Scaling to 1000 Orders a Month: How to Grow Your Candle Business in 2025
- How to Verify Wax Quality Before You Buy in India
Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on their product pages. Names, star ratings, dates and products are as recorded by Judge.me. Wording is unedited. One is below five stars and three are not recorded as a verified purchase — shown as recorded. Not recorded by Judge.me as a verified purchase, so shown without a verified-buyer badge: Ashwini, LJ, Niharika S. No location is shown against any review because Judge.me does not store one.
Figures verified September 2026 (CSI live pricing). Series costing unit: 200 g of wax plus 16 g of fragrance oil at 8% of wax weight (216 g poured), jar and labels excluded. Luxury Soy Wax Chunks: 1 kg ₹599.00 (₹599.00/kg), 10 kg ₹5,999.00; page states up to 13% of total wax weight, melt to approximately 80–85°C, add fragrance at 80–90°C and stir slowly two full minutes, pour at 75–80°C, cure at least 48 hours and ideally one to two weeks; prices inclusive of taxes. Luxury Soy Wax CSI 464 10 kg ₹5,074.00; page states up to 10% and 80–90°C as the working range for melting and pouring. Premium Coconut Soy CSI 468: page states up to 13%, melting point 50–53°C, pour 58–60°C. Eco Soy CSI 400: fragrance ceiling not published. Orchard Pear Fragrance Oil 1000 gm ₹3,738.00 (₹3.74 per gram). Eco Candle Wicks Thin (C1) ₹5.90 each in the 100 pack. Pen Thermometer ₹354.00; CSI Pro Mixer ₹349.00; Candle Care Stickers Roll 500 for ₹413.00 (₹0.83 each); Silicon Measuring Beaker 250 ML ₹600.00; Mini Electric Wax Melter 1 litre ₹2,360.00; Isopropyl Alcohol Spray 150 ML ₹383.00; Wick Centering Device ₹118.00; Hot Air Gun stock limited at the time of writing. Computed: one candle ₹185.51 (wax ₹119.80 + oil ₹59.81 + wick ₹5.90); three burn tests ₹556.52; the four-candle quality set ₹742.03, or ₹7.42 a candle across 100; a 100-jar batch ₹18,550.80; ten scrapped jars ₹1,855.08; 20 kg of wax at the 10 kg pack price ₹11,998.00; 2 kg of oil ₹7,476.00; the four-piece control kit ₹1,716.00, or ₹1.72 a candle across a thousand; two Pen Thermometers ₹708.00. The batch card, the seven tolerance bands, the batch code scheme, the sampling rate, the six-month retention period, the change-control table and the seasonal notes are CSI's working practice and illustrative worksheet design, not measured data. Diwali 2026 is 8 November 2026. Prices and availability change — the linked product pages are always authoritative.