Penosil Window & Door Silicone 312 – High‑Movement, Weatherproof Silicone for Professional Sealing
Penosil Window & Door Silicone 312 is a high‑performance, neutral oxime silicone engineered for professional glazing, sealing and finishing works. Designed for joints exposed to high movement, this advanced sealant cures into a flexible, durable and weatherproof rubber seal that maintains long‑term elasticity in both interior and exterior applications.
Ideal for window fitters, door installers, builders and façade specialists, Penosil 312 delivers reliable adhesion across a wide range of construction materials—ensuring a clean, long‑lasting finish on every project.
Why Professionals Choose Penosil Window & Door Silicone 312
High Movement Capability (±25%)
Engineered for joints that experience significant movement, ensuring seals remain flexible and crack‑free over time.
Permanent Elasticity & Low Modulus
Forms a durable, elastic silicone rubber seal that absorbs movement without losing adhesion or integrity.
Weatherproof, UV & Ageing Resistant
Suitable for long‑term exterior use, resisting harsh weather, sunlight and environmental exposure.
Excellent Adhesion to Multiple Materials
Adheres to concrete, masonry, wood, bricks, metals, PVC, glass, enamel, ceramic tiles, most plastics and painted surfaces.
Interior & Exterior Application
Perfect for glazing, perimeter sealing, ventilation works, sanitation areas and general construction sealing.
Key Features for Professionals
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Neutral oxime silicone for versatile building applications
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Flexible, weatherproof rubber seal after curing
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High movement capability (±25%) for demanding joints
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UV and ageing resistant for long‑term exterior durability
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Excellent adhesion to a wide range of substrates
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300ml cartridge format for standard silicone guns
Ideal For
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Window perimeter sealing
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Door frame sealing
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Glazing and finishing works
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Façade joints
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Interior & exterior ventilation sealing
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Sanitary and general construction applications
Available Colours
Penosil 312 is available in a wide range of colours to match window and door frames, including: Agate Grey, Anthracite Grey, Black, Bronze, Chartwell Green, Clay Brown, Clear, Cream, Mahogany, Rosewood, Toffee, White.
A Reliable, Professional Sealant for Modern Installations
Penosil Window & Door Silicone 312 provides long‑lasting flexibility, excellent adhesion and dependable weather protection—making it a trusted choice for installers, builders and glazing professionals who require consistent, high‑quality results.
