I Used the Same Wax, Fragrance, Wick and Jars When Scaling From 1 Kg to 10 Kg — What Process Variables Could Still Make the Results Different?

Same materials is only half of “same candle”

You kept the inputs identical: Luxury Soy Wax CSI 464, Sandalwood fragrance oil, the same wick and the same jar. The 1 kg test was 920 g of wax and 80 g of oil; the 10 kg batch was 9.2 kg of wax and 800 g of oil, fifty 200 g jars. That was the right discipline, and it removes a whole class of explanations. What remains is the process — the sequence of temperatures, times, movements and environments the materials passed through. None of it is written on a label, and most of it was never written down at 1 kg because it did not seem to matter.

The useful way to attack this question is not to guess which variable changed but to list them all, fill in what each was at 1 kg and at 10 kg, and see which rows differ most. The largest differences are your first suspects.

The process variables, stage by stage

The entries above are illustrations of what makers commonly write, not results. Your own sheet may show different differences. What matters is that you fill in every row and do not skip the ones that seem unimportant. At 1 kg, many of these variables were so small they were effectively zero. At 10 kg, each has room to grow.

Filling in the sheet honestly

Most makers have to reconstruct the 1 kg column from memory, and memory flatters. “I added the oil when it had cooled a bit” becomes a precise-looking number when you write it down. Where you genuinely do not know a value, write “not recorded” rather than a guess. An unknown in the 1 kg column is a reason to make a fresh reference batch and measure it properly this time, which is cheaper than building an investigation on an imagined figure.

For the 10 kg column, use the batch sheet, phone photographs with timestamps, and anyone who helped. A photo of the melter display at the moment oil went in, for example, gives you both a time and the display setting — though not the real wax temperature, for the reason explained below.

Why each stage can move the candle

Heating and holding

Your 1 kg test may well have been made in something like the 1 litre Mini Melter, which offers 300 W and 600 W modes; small charges in small vessels come up to temperature and back down quickly. A bigger melter often gets set higher and left on longer to melt the charge in reasonable time. The Electric Wax Melter page gives a display range of 60°C–100°C with a stated ±10°C deviation, so a display figure is not the wax temperature. Longer time at higher temperature before oil goes in is not a fragrance problem in itself; the problem comes when the oil is added into wax that has not come back down, and then sits in it while fifty jars are poured. Sandalwood's page states a flashpoint of 203°C, well above any candle process — flashpoint is a safety threshold, not a guide to how quickly the lighter parts of a fragrance leave hot wax.

Addition and mixing

How oil enters the wax matters more at 10 kg. Poured into one spot of a deep melter, it can sit as a concentrated patch until moved. The stir that covered a whole pitcher covers a fraction of the melter.

Pouring and cooling

A long pour means the last jars go in cooler, or the batch has to be kept hot for longer — either one is a change. Fifty jars placed tightly on a tray, near a fan or air-conditioning outlet, cool unevenly from edge to centre, and the finished surface and structure can follow. Jars brought in from a cooler store room chill the wax at the glass faster than room-warm jars did in your test.

Curing and testing

Production jars are often boxed early to save space, judged sooner because customers are waiting, and burned in a different room. Each of these moves the result without any change to the wax or oil. The product page's stated soy cure for Sandalwood is 48–72 h; re-testing at day 7 and day 14 is a suggested starting point to validate.

Testing the biggest differences first

Rank the rows of your sheet by how different the two columns are. Then take the top two or three and test each with a pair of 1 kg controls that differ only in that variable.

Keep each variant honest about everything else. If the reference is poured into jars at room temperature, so is the variant, unless jar temperature is the variable being tested. If the reference cools on an open shelf, so does the variant. The value of the paired control lies entirely in the fact that it differs from the reference in one way only, and small, unnoticed differences in handling are the most common reason a controlled test gives a confusing answer.

The fifty jars, and the sheet for next time

Once the variable is known, the disposition follows from it. A cure or testing difference means the batch was probably fine and needs judging again at the right age. A cooling or jar-temperature difference may have changed appearance or early burns but not fragrance content — burn at full cure and release if it performs. A heat-exposure difference that has reduced throw below your standard is not fixed by more oil; downgrade or write off. For scale, the materials here are about ₹9,694.88: 9.2 kg of CSI 464 at ₹507.40 per kg = ₹4,668.08, plus Sandalwood bought as a 1 kg bottle at ₹5,026.80, with 200 g left over for controls.

Then keep the difference sheet as your production record. Every column you filled in from memory this time becomes a field on the batch sheet: peak temperature, thermometer reading at addition, addition-to-last-jar time, first and last pour temperature, jar spacing, cure location, and judging age. When the 10 kg batch and its 1 kg reference agree on three runs in a row, you have a validated process, not just a validated recipe. For a second view of your sheet, message CSI on WhatsApp at +91 7397976926.

Where this page fits

CSI already has guides that cover parts of this question. This page covers the failure investigation for the question above; these go deeper on the rest:

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