Transparent soap tutorial
Safety in the first place
- Prepare your workplace and keep it organize.
- Educate your family and special care with young children.
- Be sure you understand the process.
- Wear rubber gloves and safety glasses.
- Never leave the hot oil unattended.
- Never leave the soda and soda solution unassisted.
- Work with method.
- Do not get distracted at work.
- Clean up spills immediately.
Fairly simple formula with babassu palm and castor. Stearic acid is a saturated fatty acid (C18) of animal or vegetable origin. Here we used the vegetable, it is not easy to find. Glycerin can also be bidistilled of animal or vegetable origin (biodiesel), but it is very difficult to establish its true origin.
The safety equipment, goggles and gloves are essential and should always be used in handling of raw materials and the process.
In this process is used a slow-cooker “crock pot” to perform the saponification reaction, which is a hot process “hot process”. This pan allows a more controlled, clean and safe. It could be used a system-bath instead. The characteristic heating the pan Narita NSC-35 that was used in this tutorial is seen below:
As you can see, it’s a slow cooker heating whose maximum temperature is reached at 180 min and not exceeding 85°C in regulating high.
Mold for 13 bars with 100g. The lining used was acetate sheet and is reusable, with pieces of waxed paper to protected the corners.
This lining is made from reusable acetate sheets but may be used plastic sheet for binding, sold by stationery store.. Are cut according to the inside dimensions of the mold and joined with tape.
Here is the mold lined and ready for use.
Preparing the ingredients
Weigh castor oil.
Blend all previously weighed ingredients in a plastic container 2 liter polypropylene.
Melt the oils and stearic acid in the microwave for 2:30 minutes on high, until completely dissolved.
Add lye over water with constant stirring. Never add water over soda to avoid a potential accident situation! Allow to cool to 40 ± 1 ° C.
Weigh ethyl alcohol (ethanol), away from open flames!
Add slowly while stirring the alcohol on lye solution. Do this away from open flames to prevent accidents!
Heat the lye solution and alcohol, keeping at 42°C.
Putting the mixture of oils in the slow cooker and maintaining the process temperature, 61°C.
Check the temperature of lye solution and alcohol 42°C.
Add slowly with manual stirring with a mixer, the lye solution and the alcohol over oils.
Large increase in viscosity and forming lumps. Continue adding and stirring.
Start liquefaction with decrease in viscosity. Scrape the edges with a spatula to incorporate and homogenize.
Finished the addition of lye solution and alcohol and foaming forming. Decrease stirring to avoid the formation of too much foam.
Enhances foam formation. Stir carefully.
Finished the addition of glycerin. The temperature should be about 70°C.
Hot the soap is verry liquid. Be carefully!
Remove the soap bar from the mold and is ready.
It is normal to have a pullback on the surface of the bar soap. Flush if necessary.
Cutting the bar
Cut the bars in the measure chosen. These were cut into individual cutter to weigh 100 g.
After 24 hours from the start of drying, an aliquot is withdrawn from the sample bar counter for measuring the pH.