As far as I know, the rubber compound is solid silicone rubber. Usually one-component glue, crosslinking agent, catalyst, inhibitor and glue are mixed together. Mixed rubber is generally vulcanized at high temperature after extrusion, unlike liquid rubber, which is mostly two-component and has three types: room temperature vulcanization, low temperature vulcanization, and high temperature vulcanization. As for adding the word "environmental protection" in front of the silicone rubber compound, I think it is unnecessary, because silicone rubber is very environmentally friendly.


1. Production process:

It is obtained by kneading silicone rubber raw rubber, white carbon black and other fillers in a kneader, and adding crosslinking agents, catalysts, inhibitors, various colorants, etc. on a two-roller rubber mixing machine. The resulting compound is called a silicone rubber compound.


2. Physical properties/performance:

I can only provide a rough idea of physical properties/performance:

1. Before vulcanization (curing), it is "solid". The color depends on the pigment added during mixing. If it is not added, it will be white. The plasticity value is about 200~300;

2. After vulcanization, the transparency without coloring material is not as good as that of liquid glue, and the "light transmittance" is not higher than 70%. The "rebound value" of mixed rubber with the same "hardness" is generally lower than that of liquid glue, but the "mechanical properties "But it is generally higher than liquid glue, "tensile strength" reaches 10~20MPa, "tear strength" can reach 40~60KN/m, and "elongation" is generally better than liquid glue of the same hardness. "Vulcanization temperature" is generally between 140 and 180 degrees. I won't talk about "linear shrinkage rate".


3. Chemical properties/performance:

Mixed raw rubber is a mixture of siloxanes. Its molecules belong to a chain helical structure, and its average molecular weight is between 400,000 and 800,000 mPa.s. Its viscosity is directly related to its molecular weight. Ubbelohde's viscometer can be used to measure its molecular weight, which is probably the so-called viscosity average molecular weight. Regarding the reinforcing mechanism of fillers, as far as I know, people on earth have not fully understood it yet. Probably, the filler nano-scale SiO2 powder (precipitated SiO2 powder) is evenly distributed in the raw rubber to form a crystal-like structure. The hydroxyl groups on the surface of the SiO2 particles form hydrogen bonds with the Si-O bonds of the raw rubber. Each SiO2 particle acts as A core, extending hydrogen bonds in all directions to connect with raw rubber molecular chains. Countless such structures, plus some other additives, form a high-viscosity, high-performance rubber compound.

The performance (quality) of ordinary silicone rubber is similar. As "silicone rubber" Baidu Encyclopedia said, silicone rubber has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and atmospheric aging resistance. °C (or lower temperature) to +250 °C (or higher temperature) for long-term use. As for which property (property) is superior, it is determined by the types of raw rubber, fillers and additives used.

About silicone rubber, please check the details:
https://www.siliconefoam.net/product-iota-f663a,b-liquid-silicone-rubber-foam-.html