1)multi-purpose gap filling 2)sealing around windows, doors, air-duct for HVAC 3) adpoting european advanced technology , Our OCF has a sealing, bonding, insulation, sound absorption etc function, due to it s environmentally friendly, energy-saving features, it is widely use for Construction-building, HVAC-installation and Real estate… Specification :Performance standard Q/IEFA21-1999Densit 15~ ...