Abstract: A high temperature filter material, comprising a non-woven glass fiber matrix including mica particles, polymer micro-bits and a uniformly distributed binder system, is made by a wet laid procedure, as used in paper-making. A composition comprising the mica particles and polymer micro-bits, used in making the filter material, and a method of preparing the composition are also disclosed.

Abstract: A protective mask formed from a porous non-woven sheet material which is made of glass fibers and a suitable binding agent, and which may optionally include a gas adsorbent substance. The mask protects the respiratory system of the wearer from the effects of toxic gases and the like.

Abstract: Disclosed are filter mats composed of a wet laid, porous, non-woven matrix having randomly arranged, irregularly intersecting and overlapping cellulose fibers intermixed as a cobeat (i.e. beaten together) with micro-bits of an expanded, thermoplastic styrene-polymer or lower polyolefin or of a flexible foamed polyurethane, and which mix also can include any one or more additional such micro-bits and of fiber-forming polyethylene terephthalate polyester fibers, finely divided activated carbon, diatomaceous earth, and colloidal alumina monohydrate. These mats are effective, for example, to remove insoluble particles and/or soluble substances present in liquid, presently primarily aqueous, media particularly in minute amounts, such as undesirable substances in industrial plant waste waters.