... are sold by Puyang Guolong Logistics Co., LTD, a subsidiary of Zhongyuan Da Hua Group Co.,LTD. Greencos melamine foam is a ... performance such as excellent acoustic properties, flame resistance, heat insulation, damp heat stability, health security and good processing etc. ... high hole rate can eliminate reflected wave efficiently. ♦Heat InsulationThe structure of three dimensional mesh can block air ...