Grade 1 Qualitative Filter Paper Standard Grade, circle, 110 mmA widely used standard grade filter paper for routine applications with medium retention and flow rate. It covers a wide range of laboratory applications and is frequently used for clarifying liquids.These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.Grade 1: 11 µmThe most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 10 to 500 mm diameter circles and 460 x 570 mm sheets. This filter is also available in the FilterCup, this is a convenient, disposable 70 mm filter funnel with a 250 ml capacity molded from polypropylene with an integral, heat bonded filter (catalog number 1600-001).
This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate.
In agriculture, it is used for soil analysis and seed testing procedures. In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.
In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and color formation quantified by optical reflectance.

Grade 1 Qualitative Filter Paper Standard Grade, circle, 110 mm

Grade	Grade 1
Grade Type	Standard
Diameter	110 mm
Typical Particle Retention in Liquid	11 µm1)
Nominal Thickness	180 µm
Typical Water Flow Rate (ml/min) for 9cm diameter	57
Nominal Basis Weight	87 g/m2
Nominal Air Flow Rate	13 s/100 ml/in2
Nominal Ash Content	0.06%2)
Material	Cellulose
Typical Trace Element Levels	Aluminium 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
1)Particle retention rating at 98% efficiency.
2)Ash is determined by ignition of the cellulose filter at 900°C in air.

Grade 1 Qualitative Filter Paper Standard Grade, circle, 110 mm

Selection guide

Guide to laboratory filtration Summary Using the right filter for your application can save you time and simplify your process. This document contains comprehensive selection guides for Whatman cellulose filter papers, glass fiber filters, filter vials, and syringe filters. Whether you use filters for HPLC/UHPLC sample preparation, or for a routine clarification of liquid samples, it will help you find the most suitable Whatman filter for your application.. Close