Our lrb mattresses are flexible rock fiber mattresses, stitched with wire mesh and manufactured from stable rock fibers bonded with a minimum quantity of thermosetting resin binder. Our lrb mattresses are light weight, strong, resilient, easy to handle and cut to suit intricate shapes. Facing typesour lrb mattresses are available with a galvanized steel or stainless steel hexagonal wire netting (mesh) on one or two sides.Working temperatureup to 750 cfire safety performanceour lrb mattresses are non-combustible when tested in accordance with is 3144, bs 476 (part 4), iso 1182 and astm e136 and have the following fire safety rating achievements:class I surface spread of flame in accordance to bs 476 (part 7)class 0 in accordance to the bs 476 (part 6 & 7) and to british building regulationsclass a1 in accordance with european normsshow loss in total mass less than 5% when tested in accordance to is 3144surface burning characteristics in accordance to astm e84a: fire spread index: less than 25b: smoke developed index: less than 50 standard dimensionsthickness(mm) width(mm) length(m)25 to 140 1220 1.52 to 4.00* standard densitydensity(kgm) thickness(mm)80 40 - 110100 25 - 100120 25 - 100144 25 - 100150 25 - 100