Silicone rubber is a highly active adsorbent material with excellent physical and chemical properties, finding wide application in various fields. The following are the main classifications of silicone rubber:

I. Classification by Degree of Polymerization

1. Liquid Silicone Rubber
   Compared to millable semi-solid silicone rubber and common one-component room-temperature vulcanizing silicone, liquid silicone rubber has the characteristics of good flowability and rapid vulcanization, and can be molded by casting or injection.
   It is also known as "Low-Temperature Vulcanizing Silicone Rubber" (LTV), referring to an addition reaction catalyzed by platinum compounds, with no by-products generated during the reaction.

2. Millable Silicone Rubber
   Millable silicone rubber is a synthetic rubber produced by adding silicone rubber gum to a two-roll mixer or a closed kneader, and gradually incorporating white carbon black, silicone oil, and other additives through repeated mixing.
   It exhibits different physical and chemical properties, and can be further classified into peroxide-cured and addition-cured types based on the vulcanization mechanism.

II. Classification by Vulcanization Temperature

1. Room-Temperature Vulcanizing Silicone Rubber
   Room-temperature vulcanizing silicone rubber, often a two-component condensation type, typically uses hydroxyl-terminated polysiloxane as the base rubber, combined with other ingredients and catalysts to form the compound.
   It can be packaged as either one-component or two-component; and classified as condensation-cured or addition-cured based on the vulcanization mechanism.

2. High-Temperature Vulcanizing Silicone Rubber
   High-temperature vulcanizing silicone rubber is based on high-molecular-weight linear polydimethylsiloxane, mixed with reinforcing fillers and vulcanizing agents, and vulcanized into an elastomer under heat and pressure.

III. Classification by Characteristics

1. General-Purpose Silicone Rubber
   Suitable for various general-purpose applications, such as sealing and insulation.

2. Specialty Silicone Rubber
   Designed for specific application needs, including high-strength, high-temperature resistant, low-temperature resistant, low compression set, wire and cable, oil and solvent resistant, flame-retardant, conductive, thermally shrinkable, and sponge silicone rubber, among others.

In summary, silicone rubber can be classified in various ways, with different types exhibiting distinct characteristics and application fields. In practical applications, the appropriate type of silicone rubber should be selected based on specific requirements.

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