Is One 50 Kg Batch More Efficient Than Five 10 Kg Batches If Smaller Batches Give More Consistent Candle Quality?

The material cost is identical — so compare the other things

Start with the part that surprises people. Whether you make one 50 kg batch or five 10 kg batches, the candles contain exactly the same wax and oil. Using CSI 464 with Woody Oud at 8% of total candle weight in 200 g jars:

CSI 464 is priced at ₹507.40 per kg at every pack size, so buying for five small batches rather than one big one does not change the wax price. The comparison is therefore about three other things: labour, the value exposed to a single failure, and consistency.

The labour side: fixed work versus per-candle work

Split your production time into two kinds. Fixed per-batch work happens once per batch regardless of size: setting up the bench, starting the melter, weighing and recording the oil addition, cleaning down, filling in the batch sheet and pulling QC retains. Per-candle work scales with the number of candles: preparing jars and wicks, pouring, labelling. Per-candle work is the same for 250 candles whether they come from one batch or five.

So the saving from a 50 kg batch is simply four fewer rounds of fixed work. Measure yours rather than guessing. Time one complete 10 kg batch from set-up to clean-down and separate the fixed tasks from the pouring. Suppose, purely as an illustration, your fixed work comes to 45 minutes per batch. Five batches then cost 4 × 45 = 180 extra minutes, three hours, compared with one batch. Put your own figure in its place; it is the only figure that matters.

Then set that time against what the big batch does to the per-candle work. A 50 kg pour takes as long as five 10 kg pours in total, but it must happen in one session, with wax held hot throughout. If that forces a second person onto the bench, or a slower pour at the end, some of the saving disappears.

The risk side: what one failure destroys

Now the rupees at risk. If a single 10 kg batch goes wrong — oil added too hot, a weighing slip, poor mixing — you lose ₹8,293.04 of wax and oil plus 50 jars, wicks and labour. If a single 50 kg batch goes wrong, you lose ₹41,465.20 plus 250 jars, wicks and labour.

The chance of a mistake is not obviously lower in a big batch. If anything, some failures become more likely: a weighing error on 4 kg of oil in one container, or a mixing shortfall in a deep vessel. And with five small batches, a fault in batch one is usually caught before batch two is made. With one big batch, there is no second chance inside the run.

Is your 50 kg batch really one batch?

On CSI's equipment, the practical answer is often no. The melter is sold in 10 kg and 20 kg capacities, and its page states 9.5 litres per melt for the 10 kg model — about 8.5 kg at roughly 0.9 g per ml. Fifty kilograms therefore means several fills. If each fill gets its own weighed oil and its own record, you are already making five or six smaller batches, and should treat them that way in your sampling.

A true single 50 kg batch means combining fills into one large vessel, holding it at a controlled temperature and mixing it well enough that the top and bottom are identical. That requires a heated vessel with dependable temperature control and a mixer that reaches the full depth. CSI does not sell mechanical mixers or such vessels. If you look at them elsewhere, the questions to ask are how the temperature is controlled and verified, how the mixer reaches the bottom and walls, how the vessel is drained and cleaned, and whether the electrical supply in your workspace can carry it safely.

If a 50 kg batch has already gone wrong

Many makers reach this question the hard way: the big batch was made, and the candles at the end of the pour are weaker or rougher than those at the start. The response is the same containment routine at any size, but more candles are involved.

Hold all 250 candles. Sort them by pour order, using jar numbers if you recorded them or tray order if you did not. Pull candles from the first, second, third, fourth and last fifths of the pour — five positions rather than three, because a long pour can drift gradually. Burn them beside a fresh 1 kg control made from the same lots, at a matching cure age.

If only the late fifths differ, the problem is hold time or cooling during the pour, and the early candles may be releasable. If every fifth differs from the control, look at what happened before the pour: oil addition temperature, weighing or mixing. Either way, the next batch should not be another 50 kg until the cause is found.

The arithmetic also helps with the write-off decision. Each fifth of this batch is 10 kg of scented wax worth ₹8,293.04 in wax and oil. Releasing three good fifths and holding two recovers ₹24,879.12 of material (3 × ₹8,293.04) that a blanket write-off would throw away. A middle size fits the same pattern: a 20 kg batch is 18.4 kg of wax at ₹507.40 (₹9,336.16) plus 1.6 kg of Woody Oud at ₹4,531.20 (₹7,249.92), ₹16,586.08 in all.

Making the decision

Use three questions. First, is the fixed-work saving meaningful at your volume? At a few batches a month, rarely; at dozens, perhaps. Second, can you afford to lose the larger batch without harming an order or the business? Third, have you validated the larger size — poured it beside a same-day 1 kg control, sampled its first, middle and last candles, cured and compared them?

If any answer is no, five 10 kg batches are the better choice, and the smaller batches' consistency is a feature, not an inefficiency. If all three answers are yes, move up gradually — a validated 20 kg batch first, for instance — rather than jumping to 50 kg.

Whatever the size, add Woody Oud below its flashpoint (not published on its page, so ask for the MSDS on WhatsApp) and do not run the melter at its maximum setting. Hot wax in larger quantities burns deeply; keep gloves on and the floor clear. During comparison burns, stay in the room and extinguish any candle that smokes or flares.

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