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Spray foams (insulation)
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Spray foams (insulation) : ウィキペディア英語版
Spray foams (insulation)
Spray foam insulation is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes drilled in into a cavity of a finished wall.
==History==

Polyurethane, the most common type of spray foam insulation, was developed and used by the military in the 1940s and applied to airplanes, then they realised there was a gap in the civil market that required filling. It wasn't until the 1970s that it started to be used as foam insulation.
Various systems are used to apply the spray foam. The two component high pressure system is generally used in new home construction. It is a quick expanding type of spray foam. The two component low pressure spray foam is another system that is used primarily for remodel jobs where there are existing walls with drywall already in place. This is also known as a slow rise formula and often referred to as injection foam.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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