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About product and suppliers:
        Alibaba.com offers 219 25ppi filter foam products. About 47% of these are other filter supplies, 2% are filter meshes, and 2% are sponges & scouring pads. 

A wide variety of 25ppi filter foam options are available to you, such as free samples. 

There are 139 25ppi filter foam suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 25ppi filter foam respectively. 

5ppi filter foam products are most popular in Mid East, Northern Europe, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 19 with ISO9001, 11 with ISO/TS16949, and 1 with OHSAS18001 certification.