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Ideal for gravimetric analysis and environmental monitoring. These papers are made of the highest quality alpha cotton cellulose with low ash content. Papers are double acid washed in hydrochloric acid followed by hydrochloric acid, then rinsed with ultrapure water to neutralize. Sold in packs of 100. Manufactured to exacting standards for uniform performance fast flow rate, retains Coarse particulates and gelatinous precipitates (>10 m); filter hydroxides and Metallic aerosols, environmental monitoring, silica in steel.