The Vermiculite 100 or 50L Chimney Cavity Insulation by Silvapearl is a loose fill insulation made from coarse or medium grade vermiculite, suitable for high temperatures. It comes in a bag packaging and is designed for cavity insulation in walls, floors, ceilings, and attics/lofts. This pour-in insulation is heat retardant, fire-resistant, and helps with condensation control and soundproofing. The beige colour allows for easy staining, making it a versatile and efficient insulation option for various building needs. see picture.
eBay