Product Introduction
Momentive SNAPSIL™ RTV128 is a translucent, one-component, thixotropic silicone adhesive sealant designed for vertical and overhead sealing, bonding, and electrical insulation applications. As part of the RTV122/RTV123/RTV128 family, RTV128 shares identical performance characteristics while differing only in color. It cures at room temperature through a moisture-reactive system, providing strong primerless adhesion to many metals, rigid plastics, and glass. It exhibits excellent weatherability, thermal resistance, flexibility, and chemical resistance.
Momentive SNAPSIL™ RTV128 Features
- Primerless adhesion to metals, rigid plastics, and glass*
- Non-corrosive to aluminum and steel per MIL-A-46146A+
- Lower odor cure compared to traditional acetoxy sealants
- One-component, room-temperature moisture cure
- Excellent electrical insulation characteristics
- Wide temperature performance from –60°C to 204°C, short-term to 260°C
- Outstanding ozone, weather, and chemical resistance
- UL Recognized under File No. E-36952
Momentive SNAPSIL™ RTV128 Applications
- Sealing and bonding in vertical joint assemblies
- Joining metal-to-plastic and glass-to-metal materials
- Electrical insulation of terminals, connectors, and wiring
- Formed-in-place gasket fabrication
- Industrial sealing in harsh environmental conditions
- Applications requiring long-term flexibility and durability
*Not suitable for polycarbonate due to ammonia by-product effects.
+May discolor copper and brass.
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 | RTV122: White; RTV123: Black; RTV128: Translucent |
| Consistency | Thixotropic Paste |
| Specific Gravity | 1.04 |
| Application Rate | 500 g/min |
| Tack-Free Time | 20 minutes |
| Cure Through Time | 24 hours |
| Hardness (Shore A) | 30 |
| Tensile Strength | 1.72 MPa (250 psi) |
| Elongation | 350% |
| Tear Strength | 6.1 kN/m (35 lb/in) |
| Peel Strength | 7.0 kN/m (40 lb/in) |
| Dielectric Strength | 20 kV/mm |
| Dielectric Constant | 2.8 |
| Dissipation Factor | 0.0016 |
| Volume Resistivity | 4 × 10¹⁵ ohm-cm |
| Brittle Point | -60°C (-75°F) |
| Thermal Conductivity | 0.21 W/mK |
| Coefficient of Expansion | 27 × 10⁻⁵ cm/cm°C |
