Once I Approve a New Wax, How Do I Lock Jar Preparation, Fragrance Load, Pouring Temperature and Cooling Conditions so Production Reproduces the Result?

Write every approved number down, put it where the work happens, and record it on every batch

A wax approval is really an approval of a whole process: a jar cleaned a certain way, at a certain temperature, filled with oil weighed at a certain load, poured at a certain temperature, cooled in a certain place, held for a certain time. Change any of those quietly and you are no longer producing the candle you approved — you are running a new, untested formula with your old name on it. Locking the process means three things. Every approved number is written in one place. Every number is written at the station where someone uses it. And every batch records the numbers it actually achieved, so drift shows up on paper before it shows up on the glass.

That does not mean making production complicated. A small Indian candle business does not need a forty-page manual. It needs one page of locked parameters, one batch sheet, a short release check and a single rule for changes. The jar-preparation and pouring SOP post covers the cleaning and pouring steps in depth from the adhesion side; this page covers how to fix the whole approved process after a wax qualification, including load and cooling, so production reproduces the pilot.

The worked example is a clear-glass line in the 200 ml Salsa Glass Jar, golden lug cap — whose fill CSI does not publish, so the maths runs on a labelled example fill of 160 g: 12.8 g of Blue Ocean and 147.2 g of wax at 8% — approved in Luxury Soy Wax Chunks. Chunks is used because its page publishes the most process figures: fragrance addition at 80–90°C, pour at 75–80°C in the spec table (the page's steps also show 70–80°C), a two-minute stir and a cure of at least 48 hours, ideally one to two weeks. Nothing here says Chunks adheres better than another wax; it is simply the approved wax in the example.

Jar preparation and fragrance load

Jar preparation is the step most likely to drift, because it feels like housekeeping rather than formulation. Residues on glass — skin oil, dust, a film left by a cleaning product — are among the most commonly cited local causes of wet spots, which is why bare-hand handling and a changed cleaning product each have their own posts. Lock the cleaning product, the method and the drying. Isopropyl alcohol is flammable: spray and wipe away from the melter and any flame, and never warm or pour into a jar until it is completely dry. CSI publishes no per-jar dose for its Isopropyl Alcohol Spray; measure your own use during the pilot and write it on the sheet.

At the example use, the 1 litre pack cleans a jar for ₹1.04 against ₹5.11 from the 150 ml — the 1 litre is the production pack. Glass temperature belongs with preparation: if your pilot poured into room-temperature jars, write down the room temperature it recorded and keep production within your chosen window; if it used warmed jars, lock the warming method and the measured glass temperature, never hotter than the pour temperature or the jar's limit (the Salsa's page publishes none — ask CSI on WhatsApp). Whether to preheat at all is a separate decision with its own test.

Fragrance load is locked by weighing, and by one convention. CSI's convention is load as a share of the finished candle: oil = finished weight × load. For a labelled example batch of 40 Salsa candles at 160 g, that is 6,400 g of finished candle, 512 g of Blue Ocean and 5,888 g of wax. The common slip is to add 8% of the wax weight instead: 471.0 g of oil into 5,888 g of wax is a true load of 7.41%, not 8%. A drift of a few tenths of a per cent in load is invisible by smell and can still change how the wax sets, so write the convention on the sheet and weigh every batch on the Candle Making Weighing Scale.

Pour temperature and cooling

Pour temperature is a range, not a single number, and it drifts through a batch. Record the wax temperature at the first and the last jar of every batch with the Pen Thermometer. For Chunks the locked range is the page's 75–80°C from the spec table. If the last jar regularly falls below the range, the batch is too big for the pour time — split it or rewarm, and write that into the SOP. Finding a pour temperature that gives both adhesion and good tops is where the range itself is chosen; this page only fixes it once chosen.

Cooling is the parameter most often left unwritten, and one of the commonly cited contributors to wet spots. Lock it as a rack map: which racks, which positions, what spacing, which part of the room, and the rule that jars are not moved until set. If the pilot found that edge positions behaved differently from centre positions, the map says so and puts your most visible SKUs in the better positions. Record the room temperature at the start of cooling on every batch. Spacing jars to cool at the same rate and room temperature as a recorded parameter cover the detail.

The release check, and what it can and cannot catch

Every batch gets a short appearance check before it is released: photograph a fixed number of jars — 5 of 40 in the example — from four sides against your reference grade sheet, after the minimum hold. It is an early-warning system, not proof. If a batch has gone wrong badly, five jars usually show it: a batch where 20% of jars spot is caught by five jars 67.2% of the time. A batch drifting to 5% is caught by five jars only 22.6% of the time. That is why the release check sits on top of a locked process rather than replacing it, and why your acceptance plan was proved in the pilot, not here.

Checking all 40 jars catches far more — it is also what many luxury clear-glass brands do anyway at packing, because the customer will look at every jar. At a labelled example of 30 seconds per photograph, the 5-jar check takes about 10 minutes a batch; a quick visual check of every jar at packing adds less than that if it is built into wrapping. Monitoring future lots turns release results into a running chart so slow drift becomes visible across batches.

Change control: one rule that keeps the lock

The lock only holds if changes are noticed. Use one rule: any change to a locked parameter — wax bag source, jar supplier, cleaning product, oil, load, wick, temperature range, racks, room or storage place — is written on a change form and classified before the next batch, using the same vocabulary as change control in general: KEEP (no test needed), CONFIRM (a short side-by-side against a retained control), REPEAT (a full retest of the affected results) or NEW (a test never needed before). A jar-supplier change and same-dimension jars show why even an identical-looking jar is a CONFIRM, not a KEEP.

The first locked production block, priced

Here is the first 100-candle block in the locked process, priced with listed, in-stock CSI packs: 147.2 g of Chunks and 12.8 g of Blue Ocean per candle at the example fill, with a 3% pour-loss working allowance. The wick line is the example Eco Thin C1 — use whichever wick your development approved; CSI publishes no wick size for this jar.

That is ₹208.80 of CSI materials per candle for the block, before labour, labels, boxes, freight and GST. Chunks is bought here as 3 × 5 kg + 1 × 1 kg: its 10 kg bag is ₹599.90 a kilo, more than the 5 kg bag's ₹599.00, so two 5 kg bags beat one 10 kg for the same weight (the 500 g bag is ₹598.00 a kilo, but thirty small bags are not a production purchase). Blue Ocean's 50 g pack is fractionally cheaper per gram than its 100 g or 1 kg, which is not a reason to buy oil in two dozen small bottles. Larger quantities are quoted on WhatsApp; no volume discount figure is published.

The decision rule for every batch

Apply from the top. The rule is deliberately boring: most batches release on the first line, and that is the point. When one does not, the batch sheet tells you which of the locked parameters moved, and the change-control table tells you what to test before the next batch.

The CSI products in the locked process

Where this fits in the qualification

This page owns locking the approved process. The pilot supplies the approved values; the acceptance plan supplies the grade sheet; lot monitoring watches what the lock cannot control; and the series capstone places the SOP at the end of the path from wet spots to bulk purchase. For the adhesion-side detail of preparation and pouring, the jar-prep and pouring SOP goes deeper.

Frequently asked questions