... ad the thickness Humidity Resistance(RH)>=80%Light reflectivity>=85%Fire Performancenon-combustible,reach class A according to GB8624-1999Moisture resistantconform ... ,18mm, 20mm, 21mm, 22mm etc.Product FeatureSound absorbing,Resistance to fire, warm-keeping, energy-saving, heat-insulatingPatternPine holes,Little-Stars,Lovely ...