After experiencing great efforts,Shenzhen Xinweifa Industrial Co.,Ltd.in China succeeded in developing the blasting membrane-removing technology with polyurethane sponge in late 1997,which has filled up the domestic gap,ended the monopllization by such countries as the US,Germany and Japan in this field dueto its stable quality andcompetitive price and is much favored by customers.With polyurethane as basic materials,the company has developed and produced such air cleaning materials as the activated carbon filtering net,photocatalyst filtering net,coldcatalyst filtering net and nano-silver high-grade antebacterial filtering net,which are widely used in such industries as electronics,electrical appliances,aerospace,automobile,medicine and environmental protection.