www.kindinsulation.com leading filter paper, chemical analysis filter paper, qualitative filter paper, quantitative(ashless)filter paper.Automotive filter paper, air filter paper, engine oil filter paper, diesel filter paper.is manufactured with high grade fine cotton as raw material, through modern original paper making technology and advanced paper making equipment.It is pure cotton paper of high puritycertain strength.the products are widely used for scientific research, industry, agriculture, medicine hygiene, as well as environmental protection, etc.for use of qualitative quantitative analysis as well as qualitativequantitative chromatographic analysis and test.According to the speed, divided into three kind:fast speed, medium speed, slow speed.According to figure:round and square.Round: 7cm, 9cm11cm12.5cm15cm18cm22cm Square: 600*600mm, 300*300mm.standard:GB/T 1914-93, ASTME832-81, through ISO 9001. competitive quote in china .