Glass fiber filters meet all preparation requirements in Standard Methods for procedures 2540D and 2540E. Use in Total Suspended Solids and other gravimetric analyses.

• Only routine blank testing is required; no equivalency testing necessary
• After washing, drying and desiccation, filters are weighed to the nearest 0.1mg on certified electronic analytical balances
• Weights are printed on heat-resistant Mylar™ labels affixed to convenient aluminum pans

• 8% of all ProWeigh filters are redried and reweighed to ensure weight stability
• DoubleWeigh™ filters are 100% tested to ensure weight stability to within 0.5mg
• ProWeigh filters for Volatile Solids (09-735-57) are recommended when measuring fixed or volatile solids—they're heated to 550°C (1022°F) in a muffle furnace to drive off volatiles, then desiccated and weighed