Cytiva Whatman™ Quantitative Filter Paper: Grade 40 Circles

Supports accurate analysis in applications sensitive to very low levels of background contamination. Whatman™ Quantitative Filter Paper: Grade 40 Circles are additionally useful in gravimetric analysis where ash content might affect weight measurements of combusted samples.

Product Code	Brand	Diameter (Metric)
11370454	Cytiva 1440-012	12.7 mm
10460642	Cytiva 1440-032	32 mm
11352935	Cytiva 1440-042	42.5 mm
11362935	Cytiva 1440-047	47 mm
10674122	Cytiva 1440-055	55 mm
11382935	Cytiva 1440-070	70 mm
11392935	Cytiva 1440-090	90 mm
11302945	Cytiva 1440-110	110 mm
11312945	Cytiva 1440-125	125 mm
11322945	Cytiva 1440-150	150 mm
11332945	Cytiva 1440-185	185 mm
11342945	Cytiva 1440-240	240 mm
11390454	Cytiva 1440-320	320 mm
11380454	Cytiva 1440-329	30 mm
11300464	Cytiva 1440-6168	450 mm

Description

Supports accurate analysis in applications sensitive to very low levels of background contamination. Whatman™ Quantitative Filter Paper: Grade 40 Circles are additionally useful in gravimetric analysis where ash content might affect weight measurements of combusted samples.

Ashless grades are very pure filters suitable for a wide range of critical analytical filtration procedures. Whatman™ quantitative filter papers are designed for gravimetric analysis and the preparation of samples for instrumental analysis.

• High-purity filters for quantitative analysis
• Contain 0.007% maximum ash content
• Medium nominal particle retention rating of 8μm
• Medium filtration speed (Herzberg 340 sec.)

Suited for

• Soil analysis, when separating solid matter from aqueous extracts
• Quantitative determination of milk sediment
• Use as a clean-up filter for solutions prior to atomic absorption (AA) spectrometry
• Analysis of constituent components in cements, clays, iron, and steel products
• Collection of trace elements and radionuclides from the atmosphere

Specifications

• Airflow Rate: 21 s/100 mL/in²
• Format: Disc
• Particle Retention: 8 μm
• Filtration Speed: ASTM, 75 seconds; Herzberg, 340 seconds
• For Use With (Application): Designed for gravimetric analysis and the preparation of samples for instrumental analysis.Gravimetric analysis for numerous components in cements, clays, iron, and steel products.As a primary filter for separating solid matter from aqueous extracts in
• Porosity: Medium
• Thickness (Metric): 210 μm

• Filter Type: Ashless
• Material: Cotton Linters
• Pore Size: 8 μm
• Flow Rate: Medium
• Grade: Grade 40
• Quantity: 100 Pk.
• Type: Quantitative Filter Paper