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Stearic acid

Stearic acid is a saturated fatty acid of vegetable origin used as a hardening additive in candle making and as an emulsifying ingredient in cosmetics.

In small proportions (2-5%), it significantly improves candle hardness, facilitates demolding, increases opacity, and extends burn time. It is especially useful when working with soft waxes (soy, coconut) and you need more consistency without losing their properties.

In cosmetics, it acts as an emulsifier, thickener, and stabilizer in creams, lotions, and soaps.

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Frequently asked questions about stearic acid

What is stearic acid used for in candles?

It's a plant-based hardening additive (palm, coconut). At 2-5% of the wax weight it hardens soft waxes such as soy or coconut, makes unmoulding easier, increases opacity and extends burn time.

How much stearic acid should I add to the wax?

Between 2% and 5% of the wax weight: for 1 kg of soy wax, 30 to 50 g. Don't exceed 5%, as the candle can become brittle and burn less well.

Can I use it in soy wax container candles?

It's not recommended with container soy waxes already formulated to stick to glass, as it can cause wet spots, pull-away and cracks. It works best in moulded candles and blends that need more hardness.

Is it also suitable for cosmetics?

Yes, it's used as an emulsifier in creams, lotions, soaps, balms and solid sticks. For cosmetic use, check that the grade is suitable for that application.

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