Shrinkage is one of the most common issues faced by gel wax candle makers. While gel wax is admired for its transparency and slow burn, improper handling or formulation can lead to cavities, gaps around embeds, or uneven surfaces. Fortunately, understanding the causes of shrinkage and using proper techniques can significantly improve the appearance and durability of your candles.
1. Why Gel Wax Shrinks
Gel wax is a mixture of mineral oil and polymer resin. During cooling, the mineral oil contracts, and the polymer network sets, which can create gaps or shrinkage. The extent of shrinkage depends on several factors:
- Cooling rate: Rapid cooling traps tension in the wax.
- Fragrance load: High fragrance percentages may interfere with polymer setting.
- Additives and embeds: Some decorative items may create uneven surfaces, increasing shrinkage risk.
2. Techniques to Minimize Shrinkage
- Control Cooling Speed:
Allow your candles to cool at room temperature. Avoid refrigeration or placing them near cold surfaces, as sudden temperature changes intensify shrinkage. - Optimize Fragrance Load:
Keep fragrance oil content within manufacturer recommendations, typically 0.3–3% by weight, to maintain structural integrity. - Use Stabilizing Additives:
Small amounts of stearic acid or polymer resins can improve firmness and reduce shrinkage. - Embed Carefully:
Place decorations or embeds after the gel wax has partially set to prevent cavities forming around them. - Layered Pouring:
Pouring in layers, allowing each layer to cool slightly before adding the next, reduces internal tension and prevents large shrinkage gaps.
3. Testing and Quality Control
Before producing large batches, test small candles with your chosen formula. Observe how the wax behaves as it cools, noting any shrinkage. Adjust temperature, fragrance load, or additive concentration as needed to achieve the best results.
4. Conclusion
Shrinkage in gel wax candles can be minimized by controlling cooling, using stabilizing additives, and following proper pouring techniques. With careful handling, you can produce crystal-clear, professional-quality gel candles that hold their shape beautifully.
At Waxraw, we supply premium gel wax, compatible additives, and fragrance oils to help candle makers around the world produce consistent, shrinkage-free gel candles.
📩 Contact us: [email protected]
🌐 Website: www.waxraw.com
📱 WhatsApp: +86 17638410293
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