Product Introduction
Momentive SILTRUST™ RTV21 is a two-part silicone rubber compound within the RTV11/RTV21/RTV41 family, formulated for general-purpose molding, encapsulation, and release applications. It cures at room temperature with a DBT catalyst and provides dependable mechanical strength, electrical stability, and excellent thermal resistance across broad operating temperatures.
Momentive SILTRUST™ RTV21 Features
- Adjustable work and cure times via catalyst concentration
- Room-temperature curing without solvents
- FDA compliance for certain food-contact applications (excluding acidic foods)
- Excellent adhesion performance when used with a primer
- Outstanding mold-release characteristics
- Retains flexibility and physical properties from -54°C to 204°C continuously
Momentive SILTRUST™ RTV21 Applications
- Potting and encapsulation of electrical coils and connectors
- Fabrication of cast-in-place silicone molds and gaskets
- Release coatings for metal, fabric, and other surfaces
- General-purpose molding and industrial tooling
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
- Provide quotation, sample, TDS/MSDS, and technical consultation
- Testing sample quality and verifying product compatibility in our laboratory
- Customizing material formulas for special applications
- Adapting product sizes, quantities, and packaging to meet specific needs
- Offering expert advice on suitable equipment and automation processes
- Delivering technical training and on-site support for optimal product use
Moreover, Prostech ensures the safe and accurate global delivery of all materials, including “dangerous goods”, in compliance with legal regulations. For personalized technical support or to receive a quotation, please contact us today.
| Property | Value |
|---|---|
| Color | Pink |
| Consistency | Pourable |
| Viscosity | 26,000 cps |
| Specific Gravity | 1.32 |
| Work Time | 1 hour |
| Cure Time | 24 hours |
| Hardness | Shore A 45 |
| Tensile Strength | 22 kg/cm² (310 psi) |
| Elongation | 210% |
| Tear Strength | 7.1 kg/cm (40 lb/in) |
| Shrinkage | 0.6% |
| Dielectric Strength | 16.5 kV/mm |
| Dielectric Constant | 3.8 |
| Dissipation Factor | 0.02 |
| Volume Resistivity | 2.6×10¹⁴ Ω·cm |
| Thermal Conductivity | 0.31 W/mK |
| Coefficient of Expansion | 20×10⁻⁵ |
| Useful Temperature Range | -54°C to 204°C |
| Specific Heat | 0.35 cal/g°C |
