I Melted 25 Kg of Wax but Cannot Account for the Expected Number of Finished Candles — Where Should I Look for Process Loss?

First, check the number you expected

Many 'missing candle' investigations end at the first line of arithmetic. If you melted 25 kg of wax and then added fragrance at 8% of total weight, the batch was not 25 kg. The oil for 25 kg of wax at 8% of total is 25 × 8 ÷ 92 = about 2.174 kg, so the scented batch was roughly 27.174 kg, which is about 135 candles of 200 g before any losses. If someone on the team expected 125 candles, they forgot the oil and you are actually ahead.

If instead the expectation was 135 and you boxed fewer, the gap is real. In the example used on this page, a maker using CSI 464 and Roasted Coffee boxed 121 saleable candles from that batch. That is 14 fewer than theory and a yield of about 89% (121 ÷ 135.87). Somewhere between the melter and the carton, roughly 2.6 kg of scented wax went somewhere other than a saleable candle.

Check the equipment arithmetic too. CSI's 10 kg Electric Wax Melter states 9.5 litres per melt, roughly 8.5 kg of melted soy wax at about 0.9 g per ml, so 27 kg of scented wax in that melter means at least four separate melts. Each melt leaves its own heel and film, each refill of the pitchers starts a fresh coat, and each changeover invites a drip. Four melts do not lose four times as much as one, but they lose noticeably more than a single vessel would.

The difference from a simple pouring shortfall is scale. A 25 kg run passes through many more stages, hands and hours than a 1 kg test. The loss is rarely in one place. It is spread across the process in amounts that are each unremarkable and together cost a box of candles.

A stage-by-stage map of where process loss hides

Walk the batch from carton to carton. At each stage ask two questions: does material leave the batch here, and does anyone record it?

Notice the pattern in the 'recorded' column. The largest losses often sit in stages nobody writes down, because each one feels too small to bother with during a busy pouring session.

Reconcile the batch, stage by stage

To find out where your 2.6 kg went, weigh each category rather than estimating it. Weigh vessels with their film on and subtract their empty weights. Weigh the reserved top-up jug. Weigh the rejects and the retained candles. Sample fill weights from across the run. Then line it all up:

The story changes completely once the numbers are in front of you. Six of the 14 'missing' candles were poured and exist as rejects or retained samples. The top-up reserve alone was worth almost three candles. The overfill of 3 g per candle, across 121 candles, adds up to 363 g, close to two more candles. Only about 123 g, well under half a percent of the batch, cannot be traced.

If your own unexplained line is large, perhaps more than a few hundred grams on a batch this size, the next place to look is the input: an oil weigh-back and a reference check on the wax scale. Until those two are confirmed, do not assume the rest of the process is at fault.

What to do with each category

Hot wax burns are the main hazard while scraping melters and pitchers. Let equipment cool to a safe handling temperature, switch the melter off at the wall, and never scrape a vessel that is still on its heating element. Large melters draw significant electrical load; check the circuit is suited to them before running two at once.

What the missing candles cost and how to stop losing them

Take the material cost of one 200 g candle at 8%. With CSI 464 at ₹507.40 per kg, 184 g of wax is about ₹93.36 (0.184 × ₹507.40). With Roasted Coffee at ₹3,738.00 per kg, 16 g of oil is about ₹59.81 (0.016 × ₹3,738.00). Together that is about ₹153.17 per candle before jar, wick and label. Fourteen candles is about ₹2,144.38 (14 × ₹153.17) of wax and oil, per batch, much of which was recoverable. The four rejects also consumed four ready-made wicks at ₹12.00 each, ₹48.00, plus their jars.

The fix is a yield line on every batch sheet: theoretical candles, poured candles, rejects, retained samples, saleable candles, and the weighed residue from each stage. Run it for three batches and you will see which stage dominates your losses. In the example above the priorities are obvious: size the top-up reserve to what is actually needed, tighten fill weights, and investigate the rejects.

Two process controls, both suggested starting points to validate, tend to recover the most. First, set the top-up reserve at a fixed weight based on how much you actually used in the previous three batches, rather than a generous guess. Second, sample fill weights at the start, middle and end of every run, not just the first few jars, because overfill usually creeps in as pourers get tired or the wax thickens.

Once the yield line is routine, a batch that misses expectations explains itself within minutes. For wax beyond the listed 10 kg packs, or oil documents, CSI is 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:

Three things to buy for this job

Frequently asked questions