Mold silicone rubber is generally composed of five components: base rubber, cross-linking agent, catalyst, filler and additive. Generally, base rubber, cross-linking agent and filler are made into one component, while catalyst is taken as a separate component, so mold silicone rubber is also called two-component vulcanized silicone rubber and RTV-2 room temperature solidified silicone rubber. The vulcanization is carried out at room temperature. Two groups of compounds (1% - 5% catalyst (curing agent)) are added to the main rubber component to produce crosslinking reaction, forming flexible and elastic colloid.

Use of mold silicone rubber:
It is mainly used in the toy and gift industry, craft and gift industry, furniture decoration industry, character reproduction, building decoration industry, resin handicraft industry, unsaturated resin handicraft industry, candle technology, plastic toy industry, gift and stationery industry, gypsum craft and gift industry, mold manufacturing industry, Boli industrial products, animal and plant sculpture simulation, Buddha carving handicrafts and other industries for product replication and mold making.

Selection of mold silicone rubber:
According to the operation mode, silicone rubber with hardness of 20 degrees or 40 degrees can be selected for the filling mold (mold), specifically:
20 degree hardness mold silicone rubber features: small handicrafts, low viscosity, good fluidity, easy operation, easy bubble discharge, good tensile tear strength, easy pouring.
40 degree hardness mold silicone rubber features: it is a large product with low viscosity, good fluidity, easy operation, easy bubble discharge, good tensile tear strength and easy pouring.

Structure of silicone rubber for mould:
Mold silicone rubber is generally composed of five components, namely, base gel, cross-linking agent, catalyst, filler and additive. In theory, as long as the first three components are available, mold silicone rubber can be made, but in order to obtain a certain strength, "filler" is generally necessary, and "filler" depends on the situation. Generally, the base gum, cross-linking agent and filler are made into one component, while the catalyst is taken as a separate component. The ratio of catalyst component to main rubber component is generally between 1% and 3%. The speed of the gelling reaction can be adjusted by adjusting the catalyst proportion.

Characteristics of silicone rubber for mould:
① Mold silicone rubber should have good operation performance.
② Silica gel has better fluidity, low viscosity and easy operation.
③ The smaller the shrinkage of silicone rubber, the better.
④ The tensile force of silicone rubber is better.
⑤ The silicone mold can not be deformed.
⑥ The hardness of silicone rubber shall be suitable for product use.
⑦ High temperature resistance, multiple mold turnover, longer service life, better, acid and alkali resistance and aging resistance.

For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-common-grade-htv-silicone-rubber.html