... for for Automotive engine PP air filter, Air Compressor air filter, all kinds of Engineering machinery air filter, etc. Product Test Reports ... Squaremeters.•2003, Research and Development Automotive air filter material,and Establied Retop Filter Materials Co., LTD •2004, Started ... China •2011, Relocated to Tangxia Town, Dongguan City and built new workshop up to 26,000 Squaremeters. PP color air filter ...