Silicone rubber refers to a rubber whose main chain is composed of alternating silicon and oxygen atoms, with two organic groups usually attached to the silicon atom. It contains carbon, hydrogen, oxygen, and silicon. There are various formulas that can be found in two parts or a single polymer. Some silicone contains fillers that can enhance the performance of the silicone.

Organic silicon can be divided into three types:
·Solid silicone rubber (HTV)
·Liquid Silicone Rubber (LSR)
·Room temperature vulcanization (RTV)

Silicone rubber has excellent properties such as heat resistance, cold resistance, dielectric properties, ozone resistance, and atmospheric aging resistance.The outstanding performance is that it has a wide range of operating temperatures and can be used for a long time from -60 ℃ (or lower) to+250 ℃ (or higher).It has excellent physiological inertia, non-toxic, odorless, non corrosive, transparent, easy to color, anticoagulant, and good compatibility with the body.Wide hardness range, 10-90 Shore hardness, chemical resistance, good sealing performance, and resistance to compression deformation.

Compared to conventional organic elastomers, silicone rubber is particularly easy to process and manufacture. Silicone rubber is easy to flow, so it can be molded, rolled, and extruded with low energy consumption.Therefore, it plays a very important role in polymer materials and is widely used in industries such as aviation, cables, electronics, electrical appliances, chemical engineering, etc.

With the development of various industries, people's requirements for the application conditions, safety and hygiene of products in different fields have increased, and there are higher requirements for the transparency and resilience of silicone rubber products.

So what affects the resilience of silicone rubber?
1. Insufficient vinyl content in methyl vinyl silicone rubber or uneven distribution of vinyl content in the raw rubber itself results in the rubber material not reaching the positive sulfur point during vulcanization, with a longer vulcanization rate and insufficient vulcanization, leading to poor elasticity of the rubber material. The problem of poor resilience and slow vulcanization rate can be solved by increasing the overall vinyl content in the rubber compound and adding an appropriate amount of hydrogen containing silicone oil to the formula, reducing the amount of filler and increasing the rubber content; Different types of vinyl content raw rubber can also be used, combined with a small amount of high vinyl raw rubber, to control the permanent deformation of the rubber material during tearing. In the formula, the best balance point should be found to avoid the occurrence of brittle rubber material and improve its elasticity.

2. Insufficient vinyl content in the rubber material or uneven distribution of vinyl content in the raw rubber itself results in the rubber material not reaching the positive sulfur point during vulcanization, with a longer vulcanization rate and insufficient vulcanization, leading to poor elasticity of the rubber material. The problem of poor resilience and slow vulcanization rate can be solved by increasing the overall vinyl content in the rubber compound and adding an appropriate amount of hydrogen containing silicone oil to the formula, reducing the amount of filler and increasing the rubber content; Different types of ethylene rubber can also be used in combination with a small amount of high ethylene 20 vinyl rubber to control the permanent deformation of the rubber material. The formula should find the best balance point to avoid the occurrence of brittle rubber material and improve its elasticity.

3. The acidic nature of the rubber material itself is also an important factor leading to poor resilience and slow vulcanization speed. Due to the acidity of white carbon black itself and the addition of structural control agents, the rubber material tends to be acidic. Acidic rubber materials have a delayed effect on vulcanization, and their high temperature resistance also decreases. The acidity content of the rubber material can be improved by adding appropriate weak alkaline substances. Generally, the pH value of the rubber material in the neutral or slightly alkaline range is beneficial for improving elasticity and vulcanization speed.

Polyethylsiloxane Fluids, plz check MY 2056 PES