Product Introduction
Momentive SILTRUST™ RTV421 is a two-part, high-strength silicone moldmaking material formulated for superior detail reproduction and exceptional resistance to cure inhibition, even when used with sulfur-bearing clays. Its low viscosity allows easy pouring into intricate molds, while its excellent tear strength and flexibility support durable glove and block mold production. RTV421 cures into a resilient elastomer with stable performance across a broad temperature range.
Momentive SILTRUST™ RTV421 Features
- High resistance to cure inhibition when used with sulfur-rich materials
- Low viscosity for precise replication of fine surface details
- High tear strength and flexibility for extended mold life
- Long working time to support large or complex mold pours
- Strong mechanical properties, including 530 psi tensile strength and 400% elongation
- Reliable elastomer performance from -60°C to 200°C
- Low linear shrinkage for accurate dimensional results
Momentive SILTRUST™ RTV421 Applications
- Artistic and industrial moldmaking involving sulfur-based modeling clays
- Production of block molds and glove molds
- Detailed reproduction of sculptures, prototypes, and precision components
- Molding scenarios requiring long work life and controlled flow
- Applications needing durable, flexible silicone molds with strong tear resistance
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 (Base) | Beige |
| Viscosity (Base) | 40,000 cps |
| Specific Gravity (Base) | 1.26 |
| Catalyst Color (Beta 16) | Red |
| Catalyst Viscosity | 30 cps |
| Catalyst Specific Gravity | 0.97 |
| Mix Ratio | 10:1 (wt:wt) |
| Mixed Color | Pink |
| Mixed Viscosity | 29,000 cps |
| Worklife | 60 minutes |
| Potlife | 90 minutes |
| Demold Time | 12 hours |
| Shore A (36 hr) | 18 |
| Shore A (24 hr) | 16 |
| Tensile Strength | 3.65 MPa (530 psi) |
| Elongation | 400% |
| Tear Strength | 2.32 ppi (130) |
| Service Temperature | -60 to 200°C |
| Linear Shrinkage (24 hr) | 0.2% |
| Linear Shrinkage (7 days) | 0.5% |
