Should I Heat-Test Finished Candles Before Launching Them Across India?

Why a launch is the moment to heat-test

During development you make a handful of candles and see them in one room. At launch you make hundreds, pack them, and send them into conditions you have never seen: warehouses, vans, sorting sheds and doorsteps across many climates in the same week. If the formula has a thin margin for holding its fragrance oil, a launch is exactly when that margin is tested, all at once, by people who paid you.

No published figure can stand in for your test. CSI does not state a temperature its waxes survive, and an oil's stated load range tells you what the oil maker recommends, not how that oil behaves in your jar after a warm parcel. The heat test turns 'it seems fine here' into 'it passed this condition', which is the only claim you can rely on when stock leaves the building.

Think about where your launch stock will sit before anyone buys it. Marketplace warehouses, a retailer's stockroom and your own storage shelf all add days or weeks of exposure before the courier even collects the parcel. A formula that only just holds its oil gets many chances to fail on that journey.

There is also a commercial reason. A launch is when buyers form their first opinion of a new range. An oily candle at that moment does more damage than the same candle six months later, because it defines what the brand means to the person who opened it.

What the test does not need

You do not need a laboratory, a climate chamber or a third-party certificate to run a useful launch test. You need a warm space you can hold steady and watch, a thermometer that tells you the truth, the candles exactly as buyers will get them, and the discipline to write the pass rule before looking. What makes the result trustworthy is repeatability, not expensive equipment.

What to test: the finished candle, every fragrance

Test the candle the buyer receives, not a development jar. That means cured to at least the oil page's stated minimum, wick trimmed, lid on, label applied, wrapped and boxed exactly as it will ship. Packaging changes how quickly a candle warms and how long it stays warm, and labels can trap heat against the glass.

Test every fragrance in the launch separately. Two oils at the same load in the same wax can behave very differently: one may hold easily while another sits at its limit. If you are launching four scents, you are launching four formulas. Treat any scent you have not tested as untested, even if its neighbour passed.

Test at the load you will actually produce, not a gentler one. If your production staff tend to add 'a little extra' for strength, test at the highest load that could realistically go into a jar, or, better, fix the approved load and weigh every batch so the tested candle and the launched candle carry the same oil.

The cost of testing against the cost of a failed launch

Use the FACTS example candle to put numbers on it: 200 g at 8% in CSI 464 with Lavender in a matte 200 ml jar with an Eco C1 wick uses wax at 184 × ₹0.5074 = ₹93.36, oil at 16 × ₹5.221 = ₹83.54, a ₹70.80 jar and a ₹5.90 wick, so ₹93.36 + ₹83.54 + ₹70.80 + ₹5.90 = ₹253.60 in materials. Other oils cost more or less; treat this as an example figure for scale.

The test for one fragrance is 6 × ₹253.60 = ₹1,521.60, and for four fragrances 24 × ₹253.60 = ₹6,086.40. A 500-candle launch commits 500 × ₹253.60 = ₹126,800.00 in materials before you add packaging, labour and the cost of return shipping on anything that arrives oily. The test is a small fraction of what it protects, and the candles you test are not wasted: they become your reference samples.

Run the launch gate

Allow time for this in the launch plan. Cure, three warm-cool cycles and a burn check take most of two weeks on the suggested schedule above, so the gate belongs before the photography and the marketplace listings, not after the stock is already boxed. Build it into the calendar the same way you build in label printing.

A launch does not have to wait for every scent. If three of four fragrances pass, launch those three and hold the fourth until its fix passes. A smaller launch that arrives dry is better than a full range with one oily scent damaging the rest.

Record the result in one line per fragrance: oil, load, wax, jar, wick, packaging, condition, cycles, pass or fail, date. That single sheet becomes the list of formulas you are allowed to launch, and the list production works from. Anything not on it is not ready, however good it smells on the bench.

When the launch test must be repeated

The test approves a specific combination, not a brand. Repeat it whenever any part changes: a new wax or a new batch of a wax that behaves differently, a new oil or a change in load, a different jar or wick, new packaging, or a move into a hotter season or a new region. Also repeat it if a customer reports oil, even once, because that is a field result telling you the margin is thinner than your test showed.

Keep the passed test candles labelled in a cool cupboard after launch. If a complaint arrives months later, you can compare the returned candle with the one that passed and see whether the formula or the batch drifted.

A launch heat test is not an extra step added to a working process. It is the step that tells you whether your process works outside the room you made it in.

Where this page fits

CSI already has guides that cover parts of this question. This page answers one sweating decision; these cover the neighbouring questions:

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