Overview

Geocel High Temperature Silicone is a professional-grade, one-part acetoxy silicone sealant designed for sealing and bonding applications exposed to continuous high temperatures. Ideal for use around flues, stoves, range cookers, ovens and heating appliances, it provides a durable, flexible seal that withstands temperatures of up to 250°C continuously and 300°C intermittently.

Its non-slump, solvent-free formulation is easy to apply to vertical and overhead joints, while curing to form a strong, flexible seal that resists cracking caused by thermal expansion and contraction. Suitable for a wide range of high-temperature sealing applications, Geocel High Temperature Silicone delivers reliable long-term performance in both domestic and commercial environments.

• High temperature silicone sealant
• Withstands temperatures up to 250°C continuously
• Resistant to temperatures up to 300°C intermittently
• High-strength, flexible bond
• One-part, ready-to-use formula
• Non-slump for vertical and overhead applications
• Solvent-free formulation
• Excellent flexibility after curing
• Easy cartridge application
• Ideal for heating appliances and flues

Preparation

For optimum adhesion:

• Ensure all surfaces are clean, dry and free from frost.
• Remove all dust, grease, oil, dirt, old sealants and loose material.
• Degrease surfaces using a suitable solvent and a clean, lint-free cloth where necessary.
• Allow all surfaces to dry completely before application.
• Ensure adequate ventilation when using cleaning solvents and follow all manufacturer safety guidance.

Application

• Cut the cartridge nozzle to suit the width of the joint.
• Insert the cartridge into a standard sealant gun.
• Apply a continuous bead, ensuring the sealant makes full contact with both sides of the joint.
• Tool the sealant within 5 minutes of application to create a smooth, professional finish.
• Allow the sealant to cure fully before exposing it to high operating temperatures.

Important Limitations

• Suitable for joints exposed to high temperatures up to 250°C continuously and 300°C for short periods.
• Do not use for structural bonding applications.
• Not suitable for continuously submerged joints or underwater applications.
• Do not apply to surfaces that bleed oils, plasticisers or solvents, as these may affect adhesion.
• Not recommended for use on concrete, cement, mortar, or metals that react with acetic acid during curing, including zinc, lead, brass and copper alloys.
• Always check compatibility with the substrate before use.
• Apply only when ambient temperatures are between 5°C and 40°C.

Aftercare & Storage

Aftercare

• Avoid disturbing the sealant until it has fully cured.
• Allow adequate curing time before exposing the joint to high temperatures.
• Inspect seals periodically where subjected to repeated heating and cooling cycles.
• Remove cured sealant mechanically or with a suitable silicone remover if replacement is required.

Storage

• Store in the original unopened cartridge.
• Keep in a cool, dry place away from direct sunlight.
• Protect from frost and excessive heat.
• Shelf life is 27 months when stored correctly at room temperature.
• Reseal opened cartridges and use as soon as possible for best results.