Selleys 310g 401 RTV Engineering Silicone Sealant | Up to 260°C | Australia

When standard silicone sealants simply aren’t up to the task, Selleys Silicone 401 RTV steps in. This engineering-grade, one-part acid-cure silicone adhesive sealant is formulated for the rigorous demands of industrial manufacturing, plant maintenance, and high-performance engineering applications where temperature extremes, chemical exposure, and long-term reliability are non-negotiable. It’s not just a sealant — it’s a versatile, multi-function silicone compound that adhesively bonds, seals, and electrically insulates across a broad range of substrates and applications in a single product.

Upon exposure to atmospheric moisture, Selleys 401 RTV cures rapidly to form a tough, resilient silicone rubber with excellent flexibility and dimensional stability. The result is a durable, long-lasting seal or bond that maintains its integrity across an impressive temperature range of up to 260°C — handling the kind of thermal cycling and sustained heat exposure that would degrade ordinary sealants in short order. Primerless adhesion to most common industrial substrates means it can be applied quickly and efficiently without the additional time and cost of surface primers, streamlining both manufacturing assembly and plant maintenance workflows.

Key Highlights

• Engineering-Grade RTV Silicone Performance — A true industrial-grade, one-part acid-cure RTV silicone formulated for manufacturing and plant maintenance applications where performance requirements exceed what standard consumer or construction silicones can deliver.
• Wide Temperature Tolerance Up to 260°C — Maintains its sealing and adhesive integrity across an exceptionally wide temperature range, withstanding sustained heat up to 260°C as well as significant thermal cycling — ideal for engine components, industrial machinery, ovens, and high-temperature plant equipment.
• Rapid Atmospheric Moisture Cure — Cures quickly and reliably on exposure to ambient atmospheric moisture without the need for heat, UV light, or mixing, forming a tough, resilient silicone rubber that is ready for service in minimal time.
• Primerless Adhesion to Most Substrates — Bonds directly to most common industrial and engineering substrates without requiring a surface primer, saving time and reducing material costs in both manufacturing assembly and maintenance applications.
• Excellent Chemical Resistance — Resists exposure to a broad range of industrial chemicals, oils, solvents, and fluids, maintaining its sealing and bonding performance in chemically challenging plant and manufacturing environments.
• Multi-Function: Seal, Bond & Electrically Insulate — Goes beyond conventional sealing to also function as an adhesive bonding agent and electrical insulator, making it suitable for a wide variety of engineering applications within a single product — reducing the number of specialised products required on site.
• Form-in-Place Gasket Applications — Ideal for creating custom, in-place silicone gaskets on complex or irregular mating surfaces in manufacturing and maintenance settings, providing a more complete and conforming seal than pre-cut gasket materials.
• Indoor & Outdoor Suitable — Fully approved for both interior and exterior industrial and engineering applications, providing flexibility across a wide range of deployment environments.

⚠️ Application & Safety Notes:

• For industrial, manufacturing, and plant maintenance use — ensure surfaces are clean, dry, and free from oil, grease, dust, and old sealant before application.
• Apply a continuous, even bead and assemble components before the product skins over to achieve optimum bond and seal performance.
• Acid-cure formula releases acetic acid vapour during curing — use in a well-ventilated area and avoid prolonged inhalation.
• Not recommended for use in contact with copper, brass, or sensitive electronic components that may be adversely affected by acetic acid off-gassing during cure.
• Avoid contact with eyes and prolonged skin contact — wear appropriate PPE including gloves and safety glasses during application.
• If eye contact occurs, rinse immediately with water and seek medical attention.
• Keep out of reach of children.
• Store in a cool, dry place with cap tightly sealed to prevent premature atmospheric curing in the cartridge.

⚠️ Compatibility Warning: Acid-cure silicone — not suitable for use on copper, brass, zinc, or sensitive metals that may be corroded by acetic acid during the curing process. Confirm material compatibility before use in sensitive electrical or electronic applications.

Technical Specifications