PVC or vinyl flooring products and related products can often contain small amounts of asbestos, including around 5% of very fine chrysotile. Larger and often visible amounts of chrysotile can be found in black and brown thermoplastic tiles. Old sheet floor coverings were sometimes backed with a thin layer of chrysotile paper, as were some types of underfelt such as hessian underlays for linoleum and carpets.
Asbestos might also be found in the mastics used to bond the covering to the floor. Some hardwearing composite floors contain about 2 per cent of mineral fibres, which may include asbestos.