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Hardened ashless grades
Hardened ashless filter papers are suited for a variety of precipitate sizes.

Along with general filtration
Grade 540, the range includes Grade 542 for retention of fine precipitates and Grade 541 for fast filtration.

All three grades are designed for use in gravimetric analysis.

These filter papers exhibit high wet strength and chemical resistance and are acid hardened, which reduces
ash to an extremely low level. Their tough surfaces make them suitable for a wide range of critical analytical
filtration operations.

Each grade offers a convenient combination of filtration speed and particle retention.

Fast filtration of coarse particles and gelatinous precipitates in acid/alkali solutions during
gravimetric analysis. Typical applications include fiber in animal foodstuffs, gelatin in
milk and cream, chloride in cement, and chloride and phosphorus in coal and coke.