... spongeUsageWidely used in anti-flammability,moisture-proof,sealing(sealing strip for door,window,auto,furniture etc) and earthquake resistance,sound ... Environmental protection, simple construction, impervious, leakage, and good sealing effect.It also resists to Corrosion,aging,flowing, distortion, ... to use punch oil seals,washer,sealing strip,it has excellent sealing feature,often used in the pharmacy ...