Silicone rubber has excellent high and low temperature resistance, aging resistance, excellent dielectric properties, physiological inertness and other characteristics. It has become one of the indispensable high elastic materials in modern science and technology. The main disadvantage of silicone rubber is the strength properties, especially the low tear strength, which limits its application. Therefore, the necessity to improve the strength and tear resistance of silicone rubber is crucial to the range of its application.

The difference between high tear-resistant silicone and ordinary silicone rubber?

The main components of ordinary silicone rubber compounds are: raw rubber, reinforcing filler - commonly used silica, structural control agent to prevent the interaction between silica and raw rubber, heat-resistant additives - commonly used trioxide dioxide Iron as a peroxide as a crosslinking agent.

High tear-resistant silicone is made of high-strength raw rubber, gradually adding modified fumed silica and other auxiliary materials. Compared with the fumed silica used in ordinary fumed silicone rubber, modified fumed silica Black has unique functional groups, and it has higher tear strength when mixed and formed.

What are the effects of fillers, control agents, etc. on improving tear resistance?

1. The influence of vinyl-containing organic compounds on tear resistance; in order to obtain high tear resistance, the dosage of vinyl silicone oil should be 3-5 parts. Tearability; if the dosage is too high, the aging performance will be reduced, and it is not economically reasonable.

2. The amount of silica has a significant effect on the tear resistance. Due to the change of the amount of silica, the amount of hydroxy silicone oil used as a structure control agent should also be changed accordingly; the vulcanization hardness and compression set increase with the increase of the amount of silica.

3. After the experiment of the type and amount of peroxide, it can be considered that the commonly used peroxide can be used to obtain high tear-resistant silicone rubber, and the dosage range is appropriate.

4. Influence of structure control agent; use siloxane as structure control agent. It has been experimentally verified that high tear resistance can be obtained no matter what kind of siloxane is used.

main application

High tear resistant silicone rubber material can make various silicone products such as:

Miscellaneous shapes 

Power product sheath 

Gasket film

Various extruded silicone rubber pipe strips 

car hanger 

Silicone sheet 

Various consumer goods such as silicone straps