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RTV133 - Black (383gm Cartridge)
GIS9353
Momentive SNAPSIL™ RTV133 (Black) – Flame-Retardant, Low-Odour Silicone Adhesive Sealant
SNAPSIL™ RTV133 is a black, one-component, ready-to-use silicone rubber adhesive sealant recommended for evaluation in applications across the electronics, aerospace, appliance, transportation, and other industries where flame resistance and low-odour processing are critical design requirements.
Upon exposure to atmospheric moisture at room temperature, RTV133 cures to form a tough, durable, and resilient silicone rubber. Unlike standard acetoxy-cure silicones, it utilises an alcohol-based moisture cure system, releasing non-corrosive alcohol vapours instead of acetic acid. This results in a virtually odourless cure with no pungent or unpleasant by-products, making it ideal for use in confined workspaces or sensitive assembly environments.
While RTV133 offers excellent safety and compatibility advantages, it cures more slowly than acetic acid–releasing silicones, with a tack-free time of approximately 1 hour and a full through-cure (3 mm thickness) in about 48 hours under standard conditions (25°C / 50% RH).
Key Features
- UL 94 V-0 rated – Excellent flame resistance for safety-critical applications.
- Alcohol-based cure system – Low odour, non-corrosive, and safe for use near sensitive metals (e.g., copper, brass)
- Paste consistency – Stays in place on horizontal, vertical, and overhead surfaces (up to 6 mm / ¼ in. thick)
- Room-temperature moisture cure – No mixing, heat, or primers required for most substrates
- Wide service temperature range: –60°C to 205°C (–70°F to 400°F)
- High tensile strength (650 psi) and Shore A hardness of 45 for durable, resilient seals
- Excellent electrical insulation and weatherability
Typical Applications
- Protective coatings for electronic circuits, semiconductors, and component assemblies
- Flame-retardant sealing and bonding in aerospace and transportation systems
- Encapsulation in appliances requiring UL recognition and low flammability
- Applications in enclosed or ventilated-limited areas where low odour is essential
Certifications & Compliance
- UL Recognised (File No. E-36952)
- UL 94 V-0 Flammability Rating (at 3.38 mm / 1/8 in. thickness)
Technical Notes
- Maximum recommended cure thickness: 6 mm (¼ inch)
- Non-corrosive cure chemistry – Safe for use with copper, brass, and other acid-sensitive metals
- Tack-free time: ~1 hour at 25°C (77°F) and 50% RH
- Full cure (3 mm thickness): ~48 hours under standard conditions
- Shore A hardness: 45
- Tensile strength: 46 kg/cm² (650 psi)
- Elongation: 250%
- Dielectric strength: 20 kV/mm (500 V/mil)
- Not intended for food contact, medical implantation, or constant immersion in fuels
Packaging Options
Available in cartridges.
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Momentive SNAPSIL™ RTV133 (Black) – Flame-Retardant, Low-Odour Silicone Adhesive Sealant
SNAPSIL™ RTV133 is a black, one-component, ready-to-use silicone rubber adhesive sealant recommended for evaluation in applications across the electronics, aerospace, appliance, transportation, and other industries where flame resistance and low-odour processing are critical design requirements.
Upon exposure to atmospheric moisture at room temperature, RTV133 cures to form a tough, durable, and resilient silicone rubber. Unlike standard acetoxy-cure silicones, it utilises an alcohol-based moisture cure system, releasing non-corrosive alcohol vapours instead of acetic acid. This results in a virtually odourless cure with no pungent or unpleasant by-products, making it ideal for use in confined workspaces or sensitive assembly environments.
While RTV133 offers excellent safety and compatibility advantages, it cures more slowly than acetic acid–releasing silicones, with a tack-free time of approximately 1 hour and a full through-cure (3 mm thickness) in about 48 hours under standard conditions (25°C / 50% RH).