Is stone wool safe? It feels like fiberglass?

Stone wool is spun mineral fibers made from natural rocks (see question #2). IT IS NOT FIBERGLASS. The World Health Organization (WHO) has classified stone wool as a bio-soluble product, meaning if you inhale or ingest the fibers they will dissolve into minerals in your body. The Material Safety Data Sheet (MSDS) contains this information. It also states that in the dry form, stone wool, like most minerals, can cause a slight mechanical irritation to the skin. This can be avoided by wetting the wool before you handle it or spraying hairspray on your hands and arms before handling. After handling the stone wool, rinse with tap water, but don’t scrub. To read more about the safety of GRODAN stone wool, download the MSDS.