What Temperature Range Should I Use When Comparing Candle Formulas Intended for Indian Summer Shipping?

Why one temperature is not enough to compare formulas

Most makers pick a single hot condition, put two candles in, and see which sweats. That works only when one formula is clearly weak. When both pass, you do not know which has more margin; when both fail, you do not know which came closer. Summer in India is not a single condition, and next year's hottest week may be hotter than this year's.

A ladder solves this. You raise the condition in steps and note where each formula first shows oil. The formula that holds to a higher step has more room before it fails, which is what you actually want to buy for a range that will travel. Then, separately, you approve the winner at the condition your own parcels meet.

Every number below is a suggested test condition chosen for its usefulness, not a published rating. CSI does not state a temperature that any of its waxes survives, and neither should anyone else without testing your exact candle.

The suggested conditions and what each tells you

Why stop at 45°C? Because the purpose is to tell formulas apart, not to melt them. CSI 468's page states a melt point of 50–53°C; other CSI waxes publish none. As the condition approaches the region where wax turns soft and slumps, every formula looks bad and the comparison stops meaning anything. The jar also becomes uncomfortable to handle, which is a safety reason to stay lower.

Where the route reading comes from

The approval condition should come from a measurement, not a guess. Pack one finished candle with a small min/max logger and post it on a round trip during your hottest selling month. The logger's maximum is your route reading. If you have no reading yet, use 40°C as a provisional approval condition and replace it when you have data.

Make the comparison fair before you heat anything

A worked example: you want to compare CSI 464 with CSI 468 for a Sandalwood candle at 7% of total weight. That is 14 g oil and 186 g wax per 200 g candle, or 7 ÷ 93 × 100 = 7.53% of wax weight, comfortably inside CSI 464's 'up to 10%' and CSI 468's 'up to 13%'. Sandalwood's page gives up to 10% in soy, 0% vanillin and a 48–72 hour cure, so both waxes are tested within its stated range.

For the material, seven candles per wax need 7 × 186 = 1,302 g of each wax. CSI 464 costs 1,302 × ₹0.5074 = ₹660.63 at its flat per-gram price. CSI 468 is sold in 500 g, 1 kg, 5 kg and 10 kg packs, so the nearest buy is 1 kg plus 500 g: ₹650.00 + ₹325.00 = ₹975.00, leaving a little spare. Oil for all fourteen candles is 14 × 14 = 196 g; priced from Sandalwood's 1 kg pack at ₹5,026.80, that is 196 × ₹5.0268 = ₹985.25.

Reading the ladder and choosing

A ladder result is a ranking, not a guarantee. It tells you which of two formulas is stronger in your conditions. Only the approval cycles at your own route reading tell you whether the stronger one is strong enough.

Holds versus cycles: which to use when

A hold keeps candles at one condition for a fixed time and then lets them cool. It is the right tool for ranking, because each step on the ladder changes only one thing, the temperature, and the result is easy to read. A cycle repeats warm and cool several times. It is closer to what a parcel does, moving between a hot van, a cooler hub and a doorstep, and it catches formulas that survive one warm spell but loosen with repetition.

Use holds to choose and cycles to approve. If you only run cycles, you will know whether a formula passes but not by how much. If you only run holds, you may approve a formula that tolerates one hot afternoon and fails on the third. The suggested plan above uses three candles for each job precisely so that one set climbs while the other set repeats.

Keep the clock constant

Whatever durations you choose, keep them identical for every step and every formula. A 40°C step held for six hours is a different test from one held for ten. Write the times on the record sheet, use a timer rather than memory, and do not shorten a step because the candles already look fine; the point of a step is to give both formulas the same chance to fail.

Record each step on one sheet: formula, step, thermometer reading at the start and end, hold hours, cool hours, and the blot result for each candle in plain words. When the ladder is finished, the sheet should let a colleague who was not there see at a glance which formula failed first and at which step.

Equipment that keeps the test safe and repeatable

Use a warm space you can control and watch: a small room with a thermostatic heater, or a purpose-built warming cabinet or incubator. CSI does not sell these; look for steady control and a door that keeps heat even. Confirm the reading with a separate thermometer placed among the candles, because a cabinet's own display can drift.

Never use a kitchen oven, microwave, stove top or anything with a flame. Ovens overshoot badly at low settings, and wax near a heating element is a fire risk. Keep the test supervised, keep candles unlit throughout, and let glass return to room temperature before handling and blotting.

Once the winner is approved, keep the ladder records. When you change a wax batch, an oil or a jar later, the same ladder gives you a fast comparison against a known result instead of starting from nothing.

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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Frequently asked questions