LabExact
Grade CFP42 Quantitative Ashless Cellulose Filter Paper, 2.5µm, 70mm, Ultra-Low Ash, 100/Pk SKU: LE-CFP42-070

Featuring ultra-high retention cellulose fiber technology delivering exceptional 2.5µm particle capture for critical gravimetric analysis applications. Quantitative ashless construction provides the finest particle retention of all cellulose filter paper grades, making this filter ideal for precise separation of extremely fine precipitates including barium sulfate, metastannic acid, and finely precipitated calcium carbonate. Ultra-low ash content of <0.01% ensures contamination-free results while 0.170mm thickness delivers optimized flow characteristics for demanding analytical protocols.

Key Cellulose Membrane Characteristics

Ultra-high purity cellulose construction manufactured from high quality cotton linters treated to achieve minimum 98% alpha cellulose content
Exceptional 2.5µm retention efficiency captures the finest analytical precipitates while maintaining reliable flow rates
Quantitative ashless formulation with <0.01% ash content eliminates interference in gravimetric determinations and combustion analysis
Hydrophilic surface chemistry ensures complete wetting and consistent particle capture across diverse aqueous solutions
Acid-washed processing removes trace contaminants, delivering validated purity for trace element and instrumental analysis applications

Key Construction Characteristics

Standard 70mm diameter accommodates universal filter holders and standard analytical equipment configurations
Optimized 0.170mm thickness balances mechanical strength with efficient filtration kinetics for laboratory workflows
Refined cellulose fiber matrix provides consistent porosity and reproducible retention characteristics across production lots
Nonsterile format ready for immediate use in routine analytical applications without additional preparation steps
Pack of 100 filters ensures adequate supply for extended analytical campaigns and quality control protocols

Grade CFP42 filters deliver unmatched precision for gravimetric analysis and sample preparation for instrumental analysis, accelerating your analytical workflows while maintaining the highest accuracy standards. Common applications include calcium carbonate analysis in the cement industry and gravimetric determination of barium sulfate and metastannic acid in glazes, coatings, and pigments. The exceptional purity and consistent performance of these quantitative ashless filters transform your most challenging analytical separations into reliable, reproducible procedures that meet the demanding requirements of modern instrumental analysis and regulatory compliance testing.

¹ ASTM D1795 Standard Test Method for Intrinsic Viscosity of Cellulose: https://www.astm.org/d1795-13r21.html