Whatman
Grade 1 Qualitative Filter Paper, Standard, 42.5mm Circle, 100/Pk SKU: 1001-042

Whatman Grade 1 Qualitative Filter Papers

Whatman Grade 1 Qualitative Filter Papers are the most widely used filter papers for routine laboratory applications, including qualitative analytical separations and liquid clarification. These cellulose-based papers offer medium flow rates and are trusted for their reliability across various industries.

Key Applications

• Precipitate separation (e.g., lead sulfate, calcium oxalate, calcium carbonate)
• Agricultural soil analysis and seed testing
• Food processing (liquid extraction and solid separation)
• Air pollution monitoring (atmospheric dust collection and photometric analysis)
• Gas detection via chromogenesis and optical reflectance

Grade 1 Highlights

• 11 μm particle retention (medium flow rate)
• Versatile sizes: 10–500 mm circles and 460 × 570 mm sheets

Industry Use

Laboratories: Commonly used for qualitative analytical separations and clarification tasks.

Agriculture & Food: Ideal for routine solid-liquid separations and educational demonstrations.

Environmental: Used in air quality studies and gas detection through photometric and chromogenic analysis.

Technical Specifications

Property	Value
Whatman Product Code	1001-042
Material	Cellulose
Grade	Grade 1
Size	42.5 mm
Typical Particle Retention	11 μm
Wet Burst Pressure	0.25 psi
Thickness	180 μm
Ash Content	≤0.06%
Basis Weight	87 g/m²
Air Flow Rate	13 s/100ml/in²
Format	Circles
Pack Size	100