In by Jackie Dunn

Generally, any material that slows down or retards the flow or transfer of heat. Building insulation types are classified according to form as loose-fill, flexible, rigid, reflective, and foamed-in-place. All types are rated according to their ability to resist heat flow, known as R-value. In electrical contracting, rubber, thermoplastic, or asbestos wire covering. The thickness of insulation varies with wire size and type of material, application or other code limitations.

Merriam-Webster Online Dictionary
insulation (noun)
a) the action of - insulating
b) the state of being - insulated
material used in insulating
insulation (Wikipedia)

Insulation may refer to:

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