Whatman Grade 1 Qualitative Filter Papers are the most widely used filter paper for routine laboratory applications, qualitative analytical separations, and clarifying liquids. They are the standard grade cellulose filter papers for medium flow rates. Grade 1 Qualitative Filter Papers (11 µm particle retention) are available in a variety of sizes and formats.

• Qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate
• Agricultural soil analysis and seed testing procedures
• Industrial food processing techniques to extract liquid or separate solid foodstuffs from associated liquid
• Air pollution monitoring by collecting atmospheric dust from airflow and photometrically measuring the stain-intensity
• Gas detection by quantitative chromogenesis with optical reflectance

Specifications:
• Grade: Grade 1
• Grade Type: Standard
• Material: Cellulose
• Nominal Ash Content†: 0.06%
• Nominal air flow rate: 13 s/100 ml/in
• Nominal basis weight: 87 g/m
• Nominal thickness: 180 µm
• Typical Particle Retention in Liquid††: 11 µm
• Typical Trace Element Levels: Aluminum 3.6 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead <0.5 µg/g Magnesium 21 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 6.2 µg/g Silicon 8.8 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g
• Typical water flow rate†††: 57 ml/min

†Ash is determined by ignition of the cellulose filter at 900 DEG C in air.
††Particle retention rating at 98% efficiency.
†††For 9 cm diameter
††††U.S. Sales Only
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