My Team Can Produce Faster Than We Can Quality-Check Candles — How Should QC Capacity Scale Alongside Manufacturing Volume?

Why QC falls behind first

At 50 candles a day, the maker is the QC department. They see every candle as it cools, lift each jar, notice a leaning wick without trying. Nothing is written down because nothing needs to be.

At 600 candles a day, that informal checking breaks. Pourers are busy pouring. Packers are paid to pack. The person meant to be checking is also answering WhatsApp, receiving wax and labelling cartons. Checks do not stop on a particular day; they shrink. First the weight check is skipped on busy days, then the visual check becomes a glance at the tray, and then the only real QC is the customer.

The fix is to treat QC as a production stage with a measurable load. Like melting or packing, it has an output per hour, and it needs enough hours to match the volume coming through.

Split QC into three tiers with different triggers

Not every check needs doing on every candle. Some belong to the candle, some to the batch it came from, and some to the raw-material lots in that batch. Grouping them this way makes the load calculable.

Tier 1 is quick and repetitive. Tier 2 is a paperwork review plus sampling. Tier 3 is slow, because a burn test occupies a position for hours, but it happens far less often.

Size QC hours for your volume

Take a workshop producing 600 candles of 200 g a day in 10 kg batches. That is 120 kg of scented wax, so twelve batches. Suppose a trained checker can check-weigh and inspect one candle in 15 seconds. That figure is a placeholder; time your own checker on your own jar.

Tier 1 grows exactly with output. Tier 2 grows with the number of batches, which you can reduce by using larger batches once they are validated: 20 kg batches halve the batch count. Tier 3 grows with the number of lots and fragrances, not with candles, so buying larger quantities from one lot actually reduces burn-testing work.

Move simple checks into the process

The best way to add QC capacity is often not to add QC staff but to prevent the defect or detect it where it happens.

Fill weight can be checked by the pourer as they go, with a scale on the pouring bench and a written target and range. The QC checker then samples rather than weighing all 600. Wick position can be fixed with a centring jig at the setting table, so almost every wick is centred before the wax sets instead of being judged afterwards.

Temperature should be read with a separate thermometer and written on the batch sheet at the moment of adding fragrance and at pouring. The Electric Wax Melter (Imported) shows temperatures from 60°C to 100°C with a stated ±10°C deviation, so a dial reading is not a QC record. For a wax with a stated range, such as Premium Coconut Soy Wax CSI 468 with a stated pour of 58–60°C, the checker has a clear pass or fail line.

Who does QC as the numbers rise

The right structure changes with volume. Treat the thresholds below as starting points to adapt, not rules. What matters is that someone owns QC at every stage and that the hours assigned match the load you calculated.

Whoever owns QC also owns the measuring tools. A check-weigh is only as good as the scale doing it, and a temperature record is only as good as the thermometer. Check the scale each morning with an item of known weight and write the reading down. Compare thermometers against each other periodically so a drifting one is caught. CSI's Candle Making Weighing Scale and Pen Thermometer do not publish capacity, resolution or accuracy, so this routine check is how you establish what yours actually does.

Train the backup properly. When the main checker is away, QC is exactly the job that gets skipped, because production can carry on without it for a day or two. Two trained people and a written checklist make QC resistant to holidays and sick days.

Make QC a gate, not a suggestion

QC only works if candles cannot bypass it. The simplest rule: no batch moves to packing without a signed release on its batch sheet. That makes QC capacity part of the line capacity, and any shortfall becomes visible as a queue in front of QC instead of as unchecked candles in customers' homes.

Keep a defect tally with each release: rough tops, leaning wicks, under-weight, glass marks, label errors. Once a week, add them up by cause and by batch. If under-weight candles cluster with one pourer or one jar lot, you have found something worth fixing at source, which reduces the QC load next month.

Burn tests need a place too. Candles for Tier 3 should burn after your validated hold, in a draught-free spot away from production, with nothing flammable nearby and someone present throughout. Burn positions are a fixed capacity, just like curing shelves. If you open more lots than you have positions to test them, either buy fewer, larger single-lot quantities or schedule new lots so tests do not stack up.

As volume rises, the question to ask each month is simple: did QC minutes, batches reviewed and burn tests completed grow in line with production? If output doubled and QC did not, the gap is being filled by luck.

Where this page fits

CSI already has guides that cover parts of this question. This page takes the production-floor angle; these go deeper on the rest:

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