OSI HM-270 is a professional-grade, medium modulus, one-part RTV silicone sealant designed for construction glazing and general sealing applications. It cures at room temperature upon exposure to moisture in the air, forming a permanent watertight and weatherproof bond to glass, ceramics, aluminum, primed steel, and many plastics.

Withstands temperature extremes from -60 deg F to 400 deg F without adverse effects. Highly resistant to ultraviolet light and virtually unaffected by other harsh environmental elements.

• 100% silicone rubber formula for long-lasting performance
• Waterproof and weatherproof seal
• Easy to extrude in any weather condition
• Cures at room temperature with no heating required
• Excellent tensile strength and adhesion, usually without a primer
• Ideal for glazing, windows, doors, and general construction sealing

Application: Apply to clean, dry surfaces. Allow 24-48 hours for full cure depending on humidity and temperature.