Different hadness is good for diffrenct crafts mold making, generally , it depend on the artcrafts’s size, pattern design, operation mothed, if the artcrafts is small and delicate pattern design, it’s better to Used the low hardness silicone such as 20shore A, while, it’s large and sample design, we can use higher Hardness silicone such as 30~40 shore A.
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