Before we begin to know how to make a mold, we must know some basic knowledge. molding silicone rubber is a wondrous material to make molds for many kinds of objects of small or big size, because it has many advantages of odorless, non-toxic, high resistance to tearing, resistance to extreme temperature, high simulation precision, clear texture and lines, long service, sand so on. So far, we can begin to know the detailed method of how to make a mold with molding silicone rubber, and we take a photo frame mold for example:
Step one: To prepare and dispose of original model.
If the model is smooth and flawless enough, then we can definitely make a perfect mold for it. But if the original model has many weakness, then it is hard to make a good mold, no matter how good the silicone quality is.
Step two: Fasten the photo frame model.
The joint of the frame must be sealed to prevent silicone from leaking. Then, fix the model in the frame.
Step three: Metering, mixing and vacuum deaeration.
For condensation type silicone rubber, the mixing ratio of the two parts of the silicone material is generally 100:2, which should be measured with an electronic scale. Then deaerate the mixture after stirring.
Step four: casting the mixture
Pour 1/3 mold making silicone into the frame slowly to ensure that silicone is seeped into every corner. After that, pour the rest of the silicone into it.
Step five: demould.
Take out the model when the mold making silicone is completely cured. At last, it is necessary to clean and trim the finished mold.