Filter paper is a semi-permeable, porous paper used in laboratories to separate fine solids from liquids or air. It is commonly used in chemistry, microbiology, environmental testing, and educational experiments for filtration, sample purification, and analytical procedures.

Key Features:

• Material:

  • Pure cellulose (cotton linters or wood pulp)

  • Ashless and low-linting

• Grade Options:

  • Qualitative Filter Paper: For general lab filtration (e.g., Grade 1)

  • Quantitative / Ashless Filter Paper: For precise gravimetric analysis (e.g., Grade 40–42)

  • Whatman equivalents available

• Pore Size / Retention Rate:

  • Fine (2–5 µm), medium (8–12 µm), or coarse (20–25 µm)

• Shape & Size:

  • Round or square sheets

  • Common diameters: 9 cm, 11 cm, 12.5 cm, 15 cm, etc.

• Strength:

  • Wet-strengthened versions available for vacuum or gravity filtration