Made of 100% cotton linter cellulose, Ash Content: 0.01%(Except No.4A 0.025%), Acid washed: Double acid washed in hydrochloric then hydrofluoric acid (No. 3, 5A, 5B, 5C, 6, 7), then rinsed with ultrapure water to neutralize. No. 4A is further treated with nitric acid before washing.

5A Grade Quantitatibve Filter Paper has a fast flow rate, retains coarse particles and gelatinuous precopitates (<10µm) Filter hydroxides and metalic aerosols, environmental monitoring, determine silica content in steel.
Applications include gravimetric analysis and environmental monitoring.