Safety Disclaimer
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Soap making involves caustic chemicals that can cause serious injury if mishandled. This disclaimer explains the limitations of our calculators and the safety precautions every maker must take. Please read this before making your first batch.
Purpose of This Tool
Soap Calculator is designed as an educational and planning aid for soap and candle makers. It helps you estimate the amounts of lye, water, fragrance, and other ingredients needed for a given recipe.
It is not a substitute for:
- Formal soap-making training or education
- Professional chemical safety guidance
- Verified measurements from certified laboratory equipment
- Supplier-specific SAP values from your actual oils
Always cross-reference results with a second trusted source before making any batch, especially if you are new to soap making.
Lye Safety Essentials
Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are strong alkalis used in cold-process and hot-process soap making. Mishandling can result in serious injury.
- Always add lye to water — never water to lye. Adding water to lye can cause a violent, spattering reaction.
- The lye-water solution reaches temperatures of 80–100 °C (175–212 °F). Use heat-resistant containers.
- Never use aluminium, tin, or cast iron containers — lye reacts with these metals.
- Work outdoors or in a space with strong ventilation. Lye fumes are irritating to the respiratory tract.
- Keep children and pets out of the workspace at all times.
- Store lye in a sealed, airtight container away from moisture and heat.
- Know the location of your nearest eyewash station or have a large container of clean water nearby.
Required Protective Equipment
The following PPE is considered mandatory when handling lye:
- Gloves: Nitrile or rubber gloves rated for chemical resistance. Latex is not sufficient.
- Eye protection: Safety glasses or goggles. A face shield is recommended for beginners.
- Long sleeves: Cover all skin on your arms.
- Closed-toe shoes: Protect your feet from spills.
- Apron: A chemical-resistant apron protects clothing and skin.
Limitations of Calculated Results
All amounts calculated by this tool are estimates. Results may vary from actual requirements due to:
- Variations in oil purity between suppliers and harvest seasons
- Differences between theoretical and actual SAP values for your specific oils
- Rounding in weight measurements
- Scale calibration errors in your equipment
- Altitude and humidity affecting water evaporation
- Fragrance oils that affect trace speed and saponification rate
We strongly recommend using a lye discount (superfat) of 5–8% for cold-process soap to provide a safety margin and ensure no un-saponified lye remains in the finished bar.
SAP Values & Oil Database
Our oil database contains saponification (SAP) values sourced from published industry references. These are standard averages. The actual SAP value of your oil may differ from these averages because:
- SAP values vary by oil grade, origin, and refining method
- Some oils (e.g., coconut, palm) have different SAP values for different varieties
- Blended oils (e.g., "mixed vegetable oil") have variable compositions
For critical or commercial production, obtain SAP values from your oil supplier's technical data sheet and use those values in your calculations.
Fragrance & Essential Oil Safety
Fragrance and essential oils used in soap and candles require careful handling:
- Some fragrance oils can accelerate trace — causing batter to thicken too quickly to pour.
- Certain essential oils (e.g., clove, cinnamon) are skin sensitisers at high concentrations. Always check IFRA guidelines for maximum safe usage rates.
- Fragrance oils are flammable. Keep them away from open flames and heat sources.
- Our acceleration risk ratings are general guidelines based on commonly reported behaviour — always test a small sample before a full batch.
- Skin safety of a soap or candle product depends on many factors beyond fragrance load — always perform finished-product patch testing.
Candle Making Safety
- Melted wax is a fire hazard. Never leave melting wax unattended or heat above the recommended temperature for your wax type.
- If wax catches fire, do not use water. Smother with a lid or use a dry powder fire extinguisher.
- Candle containers must be heat-resistant and rated for candle use.
- Flash point temperatures shown by the fragrance calculator are informational estimates — always verify flash point with your fragrance supplier's SDS.
- Finished candles should always be burn-tested before sale or gifting.
No Liability
Soap Calculator and EagleGiz expressly disclaim all liability for:
- Personal injury, chemical burns, or other harm resulting from soap or candle making
- Property damage caused by lye spills, wax fires, or related incidents
- Product failures, skin reactions, or complaints from finished soap or candle products
- Financial losses from batches that fail due to incorrect calculations or technique
- Any indirect, incidental, or consequential damages of any kind
Use of this calculator constitutes acknowledgment that you understand the risks involved in soap and candle making and that you accept full responsibility for your safety and the safety of others.
Emergency Information
- US Poison Control: 1-800-222-1222
- UK: Call 111 or 999 for emergencies
- EU: Contact your national poison centre (see WHO directory)
- Always have the product's Safety Data Sheet (SDS) on hand when working with chemicals
Contact
Found an error in our calculations or safety information? Please let us know — accurate data protects makers.