Abstract: The present invention describes a fiber material for use in mastic asphalt in roadbuilding for stabilizing the binder during transport, storage and incorporation, said fiber material being a macromolecular product including at least 95% of polyethylene terephthalate, the diameter of the individual fibers being .gtoreq.0.1 mm, the length to diameter ratio exceeding 5 on average, and the particle size distribution, measured as sieve passthrough as per the draft code of practice for the supply and testing of stabilizing materials in asphalt road construction in line with TP Min-StB Part 6.3.2, producing a proportion of at least 90% for the fractions .ltoreq.0.71 mm and at least 70% for the fractions .ltoreq.0.4 mm, and this product being manufactured by comminution from waste materials based on polyethylene terephthalate monofilaments.

Abstract: Described is a rollable thermal insulation comprising synthetic fiber material and having a thermal conductivity of not more than 0.04 W/m*K (determined in accordance with DIN 4108 Part 1) and a DIN 4102 Part 1 fire behavior corresponding to building material class B1, wherein the synthetic fiber material is composed of carrier and bonding fibers made of polyester, preferably polyethylene terephthalate, the bonding fibers consisting in at least parts of the surface of a polyester having a melting point which is below the melting point of the carrier fibers.