What color is mineral wool typically?

Mineral wool, often referred to as rock wool or slag wool, is a type of insulation material that is typically off brown to yellowish green in color. This color arises from the raw materials used to produce mineral wool, which includes volcanic rock, basalt, and industrial byproducts. These materials undergo high-temperature processing, resulting in the fibrous structure characteristic of mineral wool.

The specific color range can vary slightly based on the production process and the types of raw materials used, but the off brown to yellowish green hue is a consistent characteristic that distinguishes it from other insulation materials. The presence of impurities and the way the fibers are processed contribute to this distinct coloration.

In contrast, while mineral wool may have variations in appearance, it does not generally appear as pure white, vibrant yellow, or dark gray. Pure white may relate more to fiberglass insulation, while dark gray would not be typical for mineral wool, which tends to retain its distinct coloration due to its mineral composition and production methods.