mineral wool
rock wool

Rock wool (mineral wool) is the most widely used medium in hydroponics.

As with other forms of mineral wool, glass-wool insulation can be used for thermal and acoustic applications.

Working with fiberglass and mineral wool is uncomfortable and can cause skin and respiratory irritation.

That translates to a thickness of 19 1/4 inches of fiberglass or mineral wool.

Prolonged exposure could lead to long-term effects, and some types of mineral wool are considered a possible carcinogen to humans, similar to asbestos.

Blankets and batts are most commonly made of spun fiberglass or mineral wool.

Both mineral wool and fibreglass are used in autoclaves.

The outermost layer is usually simply an insulation material, e.g., mineral wool.

Glass fiber, mineral wool and cotton fiber can be spun into blankets or bats.

HF absorption can be reduced somewhat by wrapping the mineral wool in a plastic film.