Filter paper Grade 40 is made of high-quality commercial cotton pulp using advanced production and post-processing techniques; it has very little residual ash after burning and has almost no influence on the analysis results and is suitable for precise quantitative analysis. Produced under strict quality control, these high-purity filter papers are used in various important analysis and filtration steps.
Hawach BIO-40 Quantitative filter paper is a star product equivalent to Whatman’s filter paper Grade 40. Because Hawach integrates R&D and sales, our vacuum filter paper has more competitive. Filter paper filtration is more effective against chemical reactions, so it produces fewer impurities and can be used for quantitative analysis.
Different from chemical filter paper bio-43, Quantitative medium flow filter paper Grade 40 has slow particle retention (pore size 8μm). This quantitative filter paper filtration is used in several test methods. Commonly used filters in many standardized test methods, such as sample preparations and gravimetric analysis.
Filter paper filtration;
Medium flow rate filter paper;
High retention rate;
High-purity filters contain 0.007% maximum ash content.
Advantages of Competitive Vacuum Filter Paper
ISO9001 & CE third-party certification;
Lowest ashless content: < 0.007%;
High purity and consistent performance;
Easy to use: pre-cut filter paper for use directly;
Whatman Grade 40 equivalent quality but competitive vacuum filter paper;
A full range of diameters and OEM sizes and types are available.
Applications of Filter Paper Grade 40
Particle size detection in dyes;
Analysis of the specific gravity of milk sediment;
Clarification filtration of the solution before atomic spectroscopy;
Specific gravity analysis of cement, clay, iron, and steel products;
Separation of solids from aqueous extracts during routine analysis;
Collect trace amounts of elements and radionuclides from the atmosphere;
Specific gravity analysis, filtration of the solution before a determination by atomic absorption spectrophotometry, and sampling in air pollution monitoring.
Hawach Scientific Co., Ltd
Guide for Filter Paper
Ash Content (%)
Basis Weight (g/m2)
Wet Burst (mm H2O)
Grade 40, medium flow rate
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