My New Soy Wax Requires a Different Wick to Achieve the Same Melt Pool — Is That Enough Evidence to Reject the Batch?

A different wick need is a deviation, not a verdict

In goods-in language there are three levels of finding. An observation is something you noticed. A deviation is a confirmed difference from what you approved. A nonconformity is a deviation that breaks what you and the supplier agreed. A lot that seems to need a different wick starts as an observation. Your job before production is to decide whether it rises to either of the other two.

This matters because the three levels lead to different actions. An observation earns a closer look. A deviation earns quarantine and a formula decision. A nonconformity earns a rejection conversation. Jumping straight from the first to the last is how makers end up returning good wax and then discovering that the real cause was a new packet of wicks.

It also matters what you bought. If your approval rests on a product page that describes a soy container wax with a stated load, that page does not promise a particular wick in your jar. CSI product pages, for example, publish no melt pool data, no wick recommendation per jar and no lot tolerances. Your own approved formula, recorded against a reference lot, is the benchmark you are really measuring against.

Building the evidence ladder

Each rung of evidence removes one alternative explanation. Work through them in order and stop if a rung fails, because that failure is itself the answer.

Worked example: pricing the choice

Take a maker pouring 200 g candles at 8% total load from a 25 kg delivery of CSI 464 (2 × ₹5,074.00 + ₹2,537.00 = ₹12,685.00). That is 25,000 ÷ 184 = 135 candles. Her approved wick is Eco Thin (C1). The paired test shows the new lot's pool reaching only part of the jar after three hours with C1, while old-lot wax reaches the edge. A trial with Eco Thick (C2) in new-lot wax reaches the edge.

On these numbers the wick change is cheap compared with the value of the lot. That does not make it the right answer by default. If the new combination fails its full burn test, or the lot is also showing frosting, wet spots or a changed odour, the cumulative evidence may favour rejection. If this is the third lot in a row that has needed a wick change, the pattern matters more than the individual cost. And if you sell a large range of jar sizes, one lot that needs a new wick in every size multiplies the testing burden well beyond ₹477.90.

What a melt pool shift can and cannot tell you

A smaller pool with the same wick tells you the new-lot candle is absorbing the flame's heat differently. The likely wax-side reasons are a slightly higher melting range, a firmer crystal structure, or a lot that holds fragrance differently and so changes how the wick burns. None of these is a defect in itself. Natural waxes vary, and a lot can sit at a different point of normal variation from the one you happened to approve.

What the shift cannot tell you is whether the wax is worse. A lot that needs a larger wick may burn cleaner, frost less or hold its top better; a lot that pools faster may tunnel less but sweat more in summer. Look at the whole candle, not only the pool. Note soot on the glass, flame height, mushrooming after four hours, surface finish and any fragrance change, and compare each against the old-lot candle burning beside it.

It also cannot tell you anything about other jar sizes. A lot that needs one step up in a narrow jar may be fine in a wide one, or the reverse. If you sell several sizes, the deviation has to be checked in each before release, starting with the size you pour most often.

The supplier conversation

Before you decide, give the supplier a chance to respond with your evidence in front of them. A good conversation is specific and short. Send the invoice date, product name, pack sizes received, the date you opened the bag, the test design, melt pool measurements for both lots and photos.

Then ask three questions. Has anything changed in the product, its source or its processing? Have other customers reported similar behaviour on recent deliveries? What resolution do you offer if the lot does not suit my approved formula? Write the answers into your record, with the date and the name of the person who replied.

If the supplier is CSI, the channel is WhatsApp +91 7397976926. CSI does not publish certificates of analysis or lot-specific melt data on its product pages, so do not expect a document to settle the matter; your paired test is the evidence. If the lot fails your comparison and a wick change is not acceptable to you, say so. A lot that fails goes back in quarantine whoever supplied it, including us.

Making and recording the decision

A conditional release creates a traceability duty. The lot-specific wick must be written on your batch sheet, on the bags and in the formula file, so that when the next lot arrives you test it against the original approved combination, not the workaround. Otherwise each lot quietly moves your formula a step further from where you started.

Where this page fits

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

Three things to buy for this job

Frequently asked questions