In modern industrial production, silicone rubber has become one of the most widely used materials due to its excellent performance and diverse application fields. Silicone rubber is a one-component, ready-to-use adhesive and sealant that is easy to use and automatically cross-links when the material comes into contact with moisture in the air at room temperature.
However, compared with many other elastomer systems, its mechanical properties are weak. The addition of fumed silica to the silicone polymer can greatly enhance the mechanical properties of RTV-1. |
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The following is the classification of silicone rubber based on vulcanization methods and specific uses and its main applications:
1. RTV (Room Temperature Vulcanizing)：
- RTV-1：Used in sealants, adhesives, potting and encapsulation
- RTV-2：Used in mold making, encapsulation, sealants and adhesives
2. HTV (High Temperature Vulcanizing)：
- For compression molding, transfer molding and extrusion molding
3. LSR (Liquid Silicone Rubber)：
- Suitable for liquid injection molding and micro-molding applications |
We recommend using HJSIL R274 - Advantages of Hydrophobic Silica
HJSIL® R274 hydrophobic fumed silica is produced by a chemical treatment of hydrophilic grades with Dimethyldichlorosilane(DDS).
In the field of silicone rubber, especially the use of RTV-1, the following advantages can be achieved: |
High transparency
- The sealant surface is smooth without any bead block particles
- Avoid any black spots, improving the transparency of silicone sealant
Processability
- Waterproof, used for thickening and hydrophobicity of liquid systems
- Improve and maintain free-flowing and anti-caking properties of powders
- With the controlled extrusion rate
Reinforcement
- Better better reinforcement effect compared to lower specific surface area
- Better compatibility with base gum or silicone polymer
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| For the silicone sealant most used in the construction industry, you can also add only hydrophilic fumed silica, HJSIL 200. This is the most commonly used formula in silicone sealants and can be used to make acetoxy transparent sealant. It is a very cost-effective choice. |
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