LabExact
Grade CFP4 Cellulose Filter Paper, 25µm Retention, 42mm, Fast Flow Qualitative, 100/Pk SKU: LE-CFP4-042

Featuring high-speed cellulose fiber technology delivering the fastest flow rate demonstrated by qualitative filter media while maintaining 25 µm retention efficiency. Very commonly used as the first media in a multi-stage filtration process, this hydrophilic filter paper accelerates sample processing through exceptional permeability without compromising particulate capture performance. Premium cotton cellulose construction with low ash content <0.05% ensures minimal interference in analytical procedures requiring rapid clarification and preliminary separation stages.

Key Cellulose Membrane Characteristics

Ultra-fast flow rates maximize throughput while delivering 25µm particle retention for efficient coarse filtration applications
Premium cotton cellulose furnish provides consistent bright white appearance ideal for photometric analysis and visual inspection
Low ash content <0.05% determined by 900°C muffle furnace exposure minimizes analytical interference in quantitative procedures
Hydrophilic surface chemistry ensures immediate wetting and uniform liquid distribution across the entire filter area
Qualitative grade construction optimized for general laboratory separations where precise retention specifications are not critical

Key Construction Characteristics

Standard 42mm diameter accommodates common laboratory filter holders and Buchner funnels for versatile compatibility
Measured thickness under 4 psi using TAPPI method T411¹ ensures consistent performance and handling integrity
Wet-laid cellulose fiber matrix delivers reliable mechanical strength during high-volume filtration operations
Nonsterile format provides cost-effective solution for routine laboratory applications not requiring sterile conditions
100-pack quantity delivers convenient bulk supply for high-throughput laboratories and multi-stage processing workflows

LE-CFP4-042 filters excel in organic extractions and biological fluid separation processes where rapid initial clarification accelerates downstream processing stages. Often specified in air monitoring applications where the entrapment of fine particulate is not required, these filters provide optimal flow characteristics for environmental sampling and general laboratory separations. The combination of fast flow rates, consistent 25µm retention, and low ash content transforms these filters into essential components for multi-stage filtration systems demanding both speed and reliability in preliminary separation applications.

¹ TAPPI T 411 Thickness of Paper, Paperboard, and Combined Board: https://www.tappi.org/content/sarg/t411.pdf