Quantitative filter paper Filter paper Medium-speed filter paper, Jiaojie brand

This Jiaojie brand quantitative filter paper is developed for precise gravimetric analysis and quantitative chemical experiments requiring accurate weight determination after filtration. Made from high-purity cotton fibers, the pulp undergoes hydrochloric and hydrofluoric acid treatment followed by distilled water washing, effectively removing most impurities and resulting in an exceptionally low ash content of less than 0.01% after incineration—critical for minimizing analytical error. Available in diameters of 7 cm, 9 cm, and 11 cm, this medium-speed variant offers a pore size of 30–50 µm and a filtration time of 35–70 seconds, balancing flow rate with retention efficiency for reliable separation. Common applications include laboratory filtration in quantitative analysis, weight-method assays, and any scenario where consistent, low-ash filter paper is essential for reproducible results. The standardized basis weight of 80 ± 4 g/m² ensures uniform performance across batches.