🧪 Masterbatch Calculator
Pre-mix and store lye solutions for faster, more consistent soapmaking. Calculate exact amounts for your masterbatch and how much to use per recipe.
⚠️ SAFETY WARNING
- • Always add lye to water, NEVER water to lye - can cause violent reaction
- • Wear safety goggles, gloves, and long sleeves when handling lye
- • Work in a well-ventilated area - lye solution releases fumes
- • Solution will heat to 200°F+ (93°C+) - let cool before storing
- • Keep vinegar nearby for skin contact (not splashes - flush with water first)
🧪 Create Masterbatch
%
Standard concentration - good balance of handling and efficiency
g
📋 Use Masterbatch in Recipe
Enter your recipe's lye and water amounts to calculate how much masterbatch to use.
g
g
%
Masterbatch needed:393.9 g
Contains NaOH:130.0 g
Contains water:263.9 g
Additional water needed:36.1 g
Add this water to your oils before adding the masterbatch
📊 Masterbatch Recipe
💧 Distilled Water670.0 g
Always use distilled or deionized water - tap water can cause issues
⚗️ NaOH (Sodium Hydroxide)330.0 g
Use food-grade or lab-grade lye - never drain cleaner
Total Weight
1000.0 g
Concentration
33%
📝 How to Make
- 1Prepare your workspace: Put on safety gear (goggles, gloves, long sleeves). Work in a well-ventilated area or outdoors.
- 2Measure water: Pour 670.0 g of distilled water into a heat-safe HDPE container.
- 3Add lye SLOWLY: Gradually add 330.0 g of NaOH to the water, stirring continuously. Add in small amounts.
- 4Stir until dissolved: Keep stirring until all lye is completely dissolved. Solution will heat up significantly and may fume.
- 5Cool down: Let the solution cool to room temperature before capping. This can take several hours.
- 6Label and store: Label with: NaOH 33%, date made, and total weight. Store sealed in a cool, dark place.
📦 Storage Tips
- •Store in HDPE (High-Density Polyethylene) containers only
- •Label clearly with concentration, lye type, and date made
- •Keep in a cool, dark place away from children and pets
- •Lye solution remains caustic indefinitely - always handle with care
- •Use within 6-12 months for best consistency
- •Never store in glass - can shatter if solution heats up
- •Never store in aluminum - reacts with lye
📈 Concentration Guide
25% - Beginner
- • Easiest to dissolve
- • Longest work time
- • Requires more storage space
- • Won't crystallize
33% - Standard
- • Most common choice
- • Good balance
- • Easy math (1:2 ratio)
- • Stable at room temp
40% - Experienced
- • More efficient
- • Less water in recipes
- • Faster trace
- • May need warming
50% - Advanced
- • Maximum efficiency
- • May solidify when cold
- • Requires warming before use
- • Expert makers only
Masterbatch calculator by Soaply. Always prioritize safety when working with lye.