TQ22 Muftilag® is available in the following grades: TQ22 Muftilag® (With lead barrier core) TQ22 Muftilag® (With polymeric barrier core) TQ22 Muftilag® is the most versatile and acoustically efficient grade of quilting, offering absorption and attenuation plus the facility to mould to complex contours. Technical Detail Surface Mass of Core            5kgm5, Glass Fibre Density                         22kgm, Operating Temperatures       -30°C to + 150°C Fire Resistance                     BS 476 Part 4 Class 1 surface spread of flame when tested to BS 476 Part 7. Facing complies with Class O - tested to BS 476 Part 7 1987 Polymeric barrier FMVSS 302 self extinguishing.