1. cellulose nitrate membrane filters of various porosity and circles of various diameter supplied by whatman starting from whatman catalogue no. 7181001 to 7195014 2. membrane glass fiber prefilters used to extend the life of a membrane filter by placing a pre-filter adjacent to or upstream of the membrane. (this filter is made using binder) 3. glass microfibre filters (whatman equivalent) used for suspended particulate matter for air monitoring. gf/a (8x10 inch sheets), gf/c (monitoring of suspended particulate matter in water) various sizes. (this filter is absolutely binder free) 4. extaction thimbles : cellulose thimbles, glass microfibre thimbles whatman catalogue no. 2800185 to 2814199. 5. hepa air filtration media for use in absolute clean room application.