OSI® HM270 Construction Silicone Sealant

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OSI® HM270 Construction Silicone Sealant is a high-performance, one-part silicone sealant designed for demanding exterior and perimeter sealing applications. This UV-resistant, weatherproof sealant offers long-lasting flexibility and adhesion, making it ideal for use on windows, doors, masonry, and expansion joints in both residential and commercial construction.

Key Features & Benefits

Durable & Flexible: Remains permanently flexible after curing
Weatherproof Seal: Resists rain, wind, and harsh temperatures
UV-Resistant: Withstands prolonged exposure to sunlight
Wide Application: Suitable for concrete, masonry, windows, and doors
Paintable Surface: Compatible with most exterior paints after curing

Specifications

Product Name	OSI® HM270
Type	100% Silicone Sealant
Size	10.1 oz Cartridge
Color	Clear or White (varies)
Application Areas	Windows, Doors, Concrete, Masonry
Cure Time	24 Hours (Full Cure)

Choose OSI® HM270 for reliable, flexible, and weatherproof sealing on your next project. Order now and experience contractor-grade performance built to last.

Frequently Asked Questions

What is OSI® HM270 Construction Silicone Sealant?

OSI® HM270 Construction Silicone Sealant is a one-part, UV-resistant, weatherproof sealant offering long-lasting flexibility and adhesion for demanding exterior and perimeter sealing applications.

Which surfaces and joints can I use it on?

Suitable for windows, doors, concrete, masonry, expansion joints in both residential and commercial construction.

What sizes and colors are available?

Comes in a 10.1 oz cartridge, available in clear or white.

How long does it take to cure and can I paint over it?

Full cure in 24 hours. Once cured, the surface is compatible with most exterior paints.