Soap moulds determine your soap's finished size and shape. A wide variety of soap moulds are available from companies that sell soap-making supplies, but they can be expensive. Look around your home for household items that can be used as soap moulds. When you are considering what you can use for a mould, think about how you will cut the soap and what the finished size and shape will be. Also think about how you will get the soap out of the mould. Inflexible moulds need to be lined with cling film so you can pull out the soap.
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Things you need
- 3-inch PVC pipe, 8 to 12 inches long
- Cling film
- Rubber bands
- Baking dish with square corners
- Paper cups
- Quart-sized milk containers
- Boxes, such as a shoebox or stationery box
- Sharp knife
Wash and dry the PVC pipe. Put several layers of cling film over one end and hold them in place with rubber bands. Fill the pipe with melted soap, place the pipe upright in a warm place and allow the soap to set for 24 hours. To remove the soap, run hot water over the outside of the pipe, remove the cling film and push the soap out of the pipe. Use a knife to slice the soap into bars.
Line a square or rectangular baking dish with cling film, laying one piece lengthwise and another one over it crosswise. Pour in the soap, and allow it to harden. Once the soap has hardened, about 24 hours, pull on the cling film to remove the soap from the dish. Cut the soap into rectangles and allow them to continue to cure.
Wash and dry quart-sized milk cartons. Cut off the top so you have a square opening. Fill the cartons with soap and allow it to dry overnight. Fill paper cups with soap and allow it to dry overnight. To remove the soap, tear the carton or paper cup away from the soap. Slice the soap with a knife and allow it to cure.
Choose boxes with sturdy sides. Line each box with two layers of cling film long enough to hang over the sides. Pour soap into the box to the desired level. Let the soap harden overnight and then pull on the cling film to get the soap out of the box. Cut the soap into rectangles and allow it to continue curing.
Tips and warnings
- Flexible silicone baking dishes work well as soap moulds because it is easy to turn the soap out of the dishes once it has hardened.
- Make a wooden box out of 1/4-inch plywood, approximately 8 inches wide and 3 inches deep. Make it as long as you like. Line it with cling film before pouring in the soap. When you remove the soap from the mould, cut it in half lengthwise and then cut each half into bars of soap.
- If you just can't get the soap out of the mould, put it in the freezer for a couple of hours. Soap is usually easier to remove from a mould when it is very cold.
- If you use metal objects such as baking dishes as moulds, be sure to line them very well with cling film, as the lye in the soap can react with the metal and ruin your soap, and your baking pan, too.
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