Lab Filter Paper — Fast, Medium, Quantitative & Qualitative Types

1. Grade Types & Applications

• Fast filter paper: for quick filtration when retention precision is less critical

• Medium (or “standard”) filter paper: balance between speed and retention

• Qualitative grade: for general lab separation (e.g. precipitates, suspensions)

• Quantitative (ashless) grade: for gravimetric analysis, total solids, trace determinations

2. Performance & Material Properties

• Low ash content: minimizes background interference

• High purity cellulose: minimal fiber release or interference

• Uniform pore structure: tight control over retention and flow rate

• Good mechanical strength: retains shape under vacuum or suction

• Chemical compatibility: stable in acids, bases, organic solvents (within specified limits)

3. Size Options & Formats

• Discs (various diameters, e.g. 11 mm, 47 mm, 90 mm, 110 mm, 150 mm, etc.)

• Sheets (various dimensions, e.g. 185 × 185 mm, 270 × 300 mm, etc.)

• Rolls (for continuous lab filtration, if applicable)

4. Quality Assurance & Certifications

• Produced under ISO 9001 and ISO 14001 certified processes (as the original page indicates)
  

• Raw materials subjected to strict incoming quality control

• In-process and final inspections repeated to ensure consistent standard
  

• Products tested or certified by independent institutes to guarantee suitability for laboratory usage
  

5. Handling & Storage Tips

• Store in clean, dry, and dust-free environments

• Avoid high humidity or direct sunlight

• Handle gently to avoid folding, bending, or contamination

• Use clean tools or tweezers to avoid introducing residues

6. Typical Laboratory Applications

• Gravimetric and quantitative analysis

• Environmental and water testing (suspended solids)

• Microbiology (microbial count filters)

• Chemical precipitation and filtration

• Clarification of reagents, culture media