... ,thermal insulation 2.sound absorption 3.Non-combustible, 4.nontoxic fiber glass roll R-valueLength (mm)Width (mm)Thickness (mm)R ... -40020-10045-90 ItemUnitIndexStandardDensityKg/m310-100GB/T 5480.3-1985AVERAGE FIBER DIAUm5.5GB/T 5480.4-1985Water content%1 maxGB/T ... wool's good performance, e.g., thin and long inner fiber, low thermal conductivity, it can stop air flowing and heat ...