Supex 280 High Temperature RTV Silicone Sealant - Image 2

Supex 280 High Temperature RTV Silicone Sealant

A high Temperature RTV Silicone Sealant is a single-component, room-temperature curing adhesive and sealant that withstands heat up to 300°C. It forms a tough, flexible, waterproof, and oil-resistant silicone rubber upon exposure to moisture. The red, non-sag formulation is ideal for use on both vertical and horizontal surfaces, making it suitable for high-temperature gasketing and sealing applications in automotive and industrial environments.

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Product description

Supex 280 High Temperature RTV Silicone Sealant – 300°C Heat Resistant

Supex 280 is a premium high temperature RTV RTV silicone sealant designed for demanding automotive, industrial, and electrical applications. It delivers reliable heat resistance, excellent adhesion, and long-lasting performance, making it the go-to solution for professionals who need durable seals under extreme conditions.

Key Features

High temperature resistance: Withstands heat up to 300°C without cracking.
Durable and elastic: Maintains strength while absorbing vibration and thermal expansion.
Chemical and moisture resistant: Ideal for harsh industrial and automotive environments.
One-component formula: Ready to use and cures at room temperature.
Versatile adhesion: Bonds metals, glass, ceramics, and many plastics.

Applications in India: Automotive & Industrial

Supex 280 RTV silicone sealant is perfect for a wide range of uses:

Automotive Engines: Formed-in-place gaskets for valve covers, oil pans, water pumps, exhaust manifolds, engine block-to-head flanges, and rear axle housings—prevents leaks in high-heat Mumbai workshops and heavy vehicles like trucks, tractors, generators.
Exhaust & Under-Hood Systems: Sealing exhaust stacks, crossovers, and high-temp components in cars, bikes, and commercial fleets for oil/fuel resistance.
Industrial Equipment: Assembly/repair of furnaces, ovens, boilers, heavy-duty pumps, gearboxes, compressors, and turbines—ensures durable seals in manufacturing plants across India.
HVAC & Electrical: Encapsulating heating elements, sealing ducts, and insulating panels in factories and appliances up to 300°C.

High Temperature RTV vs Standard Silicone

Using Supex 280 high temperature RTV ensures a strong, permanent, and reliable bond. It combines the heat resistance of RTV silicone with excellent flexibility and chemical stability. Professionals trust it for projects where durable sealing is critical.

Temperature Resistance: High-temp RTV withstands continuous 250–300°C (up to 343°C intermittent); standard silicone degrades around 150–200°C.
Applications: High-temp ideal for engines, exhausts, ovens, furnaces; standard suits general sealing (windows, bathrooms, plumbing).
Chemical/Heat Durability: High-temp offers better oil/fuel/chemical resistance under heat; standard may soften, crack, or fail in hot conditions.
Cost & Flexibility: High-temp is more expensive but maintains elasticity in extreme heat; both cure at room temperature (RTV).

Strong Performance, Easy Application

Apply Supex 280 straight from the tube for precise, clean results. Once cured, it forms a permanent, watertight, and flexible seal that withstands extreme temperatures and mechanical stress.

Don’t compromise on sealing quality. Choose Supex 280 high temperature RTV for your automotive, industrial, or electrical applications today.

Q1: What is high temperature RTV?
High temperature RTV is a RTV silicone sealant designed to withstand extreme heat. It provides durable, flexible, and moisture-resistant seals for automotive, industrial, and electrical applications.

Q2: Where is high temperature RTV used?
Used in engines, exhausts, electrical panels, HVAC systems, and industrial equipment.

Q3: How do I apply it?
Apply directly from the tube; it cures at room temperature to form a permanent, heat-resistant seal.

Order now or contact us to learn how Supex 280 can improve your project performance.

Applications

Bonding and sealing of metals, ceramics, glass, and silicone rubber components
Gasket dressing and upgrading of conventional or pre-cut gaskets that fail at high temperatures
Formed-in-place gasket or sealant for replacing pre-formed gaskets in systems operating up to 300°C
Sealing and encapsulating heating elements in electrical appliances for continuous operation up to 280°C
Assembly and repair of industrial furnaces, ovens, boilers, exhaust stacks, and high-temperature ducting
Automotive gasketing applications such as valve covers, oil pans, water pumps, end seals, and rear axle housings
Bonding and repair of fabricated silicone gaskets and high-temperature components

Supex High Temperature RTV Silicone Sealant is ideal wherever heat, vibration, and chemical exposure demand a resilient, long-lasting seal.

Usage instructions

Surfaces to be adhered or sealed should be free of dirt, oil, and other contaminants.
For best performance, clean the surface with a solvent such as IPA, Acetone, or MEK.
For better appearance, use masking tape to cover the outside of joint areas before application.
Tool immediately after sealant application.
Remove masking tape before the sealant skins.

Technical details

Property	Value
Chemical Base	Oxime cure silicone
Specific Gravity (ASTM D 1045–86)	1.02 ± 0.03 g/cm³
Extrusion (ISO 6927)	400 g/min
Tack Free Time (25°C and 50% R.H.)	20–30 min
Cure Rate (1 day) (25°C and 50% R.H.)	3 mm
Modulus at 100% (MPa) (ASTM D412)	0.4 MPa
Tensile Strength (ASTM D412)	1.80 MPa
Elongation at Break (ASTM D412)	500%
Shore Hardness	22 Shore A

Storage & shelf life

12 months in unopened packaging when stored in a cool, dry place at temperatures between +5°C and +27°C and humidity between 30%–70%.
Optimal storage is in the lower half of the recommended temperature and humidity range.
To prevent contamination, do not return unused material to its original container.