Industrial Felt, felt sheet, industry felt:

is a textile structure composed entirely of fibres physically interlocked and consolidated by the utilisation of mechanical work, chemical action and moisture without the use of weaving, knitting, stitching, thermal bonding or adhesives. Pressed Wool Felt commonly known in commercial parlance as "Engineering Felt" is available in sheet and roll form known as SAE Felt. Technical Felt is available in sheet form. Both are available in various qualities, thickness and density.