If you have loose-fill insulation that is white and fluffy and has a little shine, it is probably fiberglass fill. Because it is a glass product, fiberglass has a slight shine when subjected to bright light. It is very soft, almost like cotton candy, and is composed of very fine fibers2.

What is the white insulation?

Northern White Fibre Glass Blowing Insulation is used in residential and commercial construction as a thermal and acoustical insulation. … This insulation contains no asbestos, perlite, vermiculite or phenol-formaldehyde binder. These insulation products may qualify for energy tax credits.

What is fluff insulation?

Here’s a technique to remember: Fluff your insulation as you install it. Before putting each piece in place, simply shake it out gently. The tendency is to forcibly stuff insulation in place–the “more is better” theory. With insulation you want a lot, but you want it to be as fluffy as possible.