Some questions about manual mold silicone rubber

Nowadays,manual mold silicone rubber has been widely applied to a variety of fields for making silicone mold. But there are some questions which are often asked when customers ask for help for technical guidance.Such as how to deal with the bubbles during the mixing process and what should you do for deformation of the silicone rubber? For the two problems,here I will do a detailed answer to you.     　　First,how to deal with the bubbles during the mixing process？ It depends on your practical situation.Firstly you can deal with the mixture with a vacuumizer if you have one.If you don’t have a vacuum pumping,you can reduce the mixing ratio of the hardener from 4% to 1%-2%.Then in the prior period of the reaction of the mixture will be slower,then the air in the mixture will exhaust by itself for a longer curing time to release the bubble.   　　Second,what should you do for deformation of the mold silicone rubber?It should deal apart according to the site of the products, in principle,the hardness of the silicone rubber should be according to the size of the products.If the products features small size and detailed patterns on it,the soft silicone can be applicable which the shore A should be 15-20 for easy demoulding and not damage of the patterns.Other wise harder silicone rubber be need for large size products,such as products with size 50cm will need harder silicone rubber with 40-50 shore A,then no-deformation.If large products but features detailed patterns then 30 shore A silicone rubber will be workable.The process should be a layer silicone rubber add a layer fiber glass or cloth.The outer of mold can be plaster,glass fiber reinforced plastic(unsaturated resin and fiber glass)to protect the products from deformation.