How to Choose Fumed silica in RTV-2 and LSR?

Aerosil Fumed Silica Display

Selecting the right fumed silica for use in RTV-2 and LSR formulations is crucial to achieving desired performance characteristics and product quality. Here are some key factors to consider when choosing fumed silica for RTV-2 and LSR applications:

### Factors to Consider:

1. **Particle Size and Surface Area:**
   - **Particle Size:** The particle size of fumed silica can influence properties like thixotropy and reinforcement. Smaller particles generally offer better reinforcement properties.
   - **Surface Area:** Higher surface area fumed silica can enhance properties like viscosity control and reinforcement.

2. **Reinforcement Requirement:**
   - Consider the level of reinforcement needed in the final product. Different types of fumed silica offer varying degrees of reinforcement capabilities.

3. **Thickening and Rheology:**
   - The fumed silica selected should be able to provide the desired thickening effect and rheological control to achieve the required viscosity and flow properties in the RTV-2 and LSR formulations.

4. **Compatibility:**
   - Ensure that the fumed silica is compatible with the other components of the RTV-2 or LSR formulation to prevent issues like phase separation or aggregation.

5. **Chemical Interactions:**
   - Evaluate any potential chemical interactions between the fumed silica and other components in the formulation to avoid adverse effects on curing, stability, or performance.

6. **Processability:**
   - Consider the ease of dispersion and mixing of the chosen fumed silica in the RTV-2 or LSR formulations to ensure consistent and uniform distribution.

7. **Application-Specific Requirements:**
   - Tailor the choice of fumed silica Hydrophilic based on specific performance criteria such as tear strength, elongation, hardness, and other mechanical properties required for the end application.

8. **Supplier Reputation and Quality Assurance:**
   - Choose a reputable supplier of fumed silica with a track record of providing high-quality materials and technical support for silicone formulations.

9. **Regulatory Compliance:**
   - Ensure that the selected fumed silica meets regulatory standards and complies with relevant industry regulations for use in RTV-2 and LSR applications.

By carefully considering these factors and selecting the most suitable fumed silica based on the specific requirements of the RTV-2 and LSR formulations, manufacturers can optimize the performance, processing characteristics, and quality of their silicone-based products. Conducting thorough evaluations and possibly testing different fumed silica options can help identify the most appropriate choice for each application.