... , Excluding halogen, sulfur and toxic ingredients, Watertight, smoke, airtight, Smoke non-toxic, 40 years long-term performance; Construction ... 100%18Shore hardnessabout5219Fireproof propertyRefractory integrity≥2h,Refractory GeReXing≥2h Installation instructions1, clean openings,2, in the airtight ... adequately,3, will be mixed evenly into the liquid myriapod parts, waiting for curing;4, can install ...