... rate, stable shape, no deformation. 6. Sound insulation: 6mm-thinck panel’s sound insulation volume is 29 dB, with good sound ... coefficient is 0.0216 W(m.k), with good heat insulation performance. 8.Endurance: no frost appearing and salt recovery, ... in smoke exhaust pipe, air conditioner blast pipe, air conditioner duct, anti-smoke-exhaust pipe, compound blast pipe, and heat insulation material, etc. ...