OSI® HM-270® Construction Silicone Sealant

OSI Products / OSI® HM-270® Construction Silicone Sealant

OSI® HM-270® Construction Silicone Sealant

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OSI® HM-270® Construction Silicone Sealant OSI HM-270 is a high modulus, one-part RTV silicone construction sealant designed for sealing. It cures at room temperature upon exposure to moisture in the air providing good tensile strength and excellent adhesion to most non-porous building materials. HM-270 easily withstands temperature extremes and is highly resistant to UV light. HM-270 offers superior elasticity, long-life reliability and is unaffected by other harsh environmental elements.

  • Excellent for Non-porous material
  • Waterproof & Weatherproof
  • Easy Extrusion in any weather
  • Permanently Flexible
  • 4'' Professional Nozzle
  • 10.2 fl oz (30ml) cartridge
  • Black
  • Brown
  • Clear
  • Grey
  • Tan
  • White
Clean Up

Mineral spirits or paint thinner

Related Products

OSI® HM-270® Construction Silicone Sealant

Recommended for

HM-270 Silicone Construction Sealant is primarily used for structural or conventional type glazing and curtainwall sealing involving glass, plastic or metal. For general usage, HM-270 has many applications including sealing skylights, solar panels, ventilators, aluminum siding and windows, heating/air conditioning units, duct work, recreational vehicles, and other glass, plastic or metal assemblies.

Not Recommended for

  • Applications requiring painting (Paint will not adhere to silicone)
  • Applications in totally confined or air-free spaces
  • Joints subject to continuous water immersion (i.e. swimming pools, boats, etc)
  • Use with concrete, marble, oily woods, limestone, brick, lead surfaces and vinyl
  • Sealing green or vulcanized rubber
  • Horizontal joints or traffic bearing joints where abrasion resistance is required (i.e. walkways, driveways, runways, etc)



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