Quantitative Filter Papers, Whatman®
About this item
Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs:
- Acid-treated for high wet-strength
- Extremely low ash content (0.006% ash maximum)
- Nominal particle retention of 8 µm
- Medium flow rate (Herzberg filtration speed 200 s)
- High chemical resistance to strong acid and alkali suspensions
Hardened low ash grades: 0.015% ash maximum – treated with a strong acid to remove trace metals. The maximum ash content of these grades is intermediate between ashless and qualitative. They are particularly suitable for Büchner filtrations where it is desirable to recover the precipitate from the filter surface after filtration. Other characteristics include high wet strength and chemical resistance which are similar to the acid hardened ashless filter papers.
Hardened ashless grades: Quantitative filter papers with 0.006% ash maximum featuring high wet strength and chemical resistance. These papers are acid hardened, which reduces ash to an extremely low level. Their tough surfaces make them suitable for a wide range of critical analytical filtration operations. Each grade offers a convenient combination of filtration speed and particle retention.
3 Options Available Below
Product Details & Documents
Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs:
- Acid-treated for high wet-strength
- Extremely low ash content (0.006% ash maximum)
- Nominal particle retention of 8 µm
- Medium flow rate (Herzberg filtration speed 200 s)
- High chemical resistance to strong acid and alkali suspensions
Hardened low ash grades: 0.015% ash maximum – treated with a strong acid to remove trace metals. The maximum ash content of these grades is intermediate between ashless and qualitative. They are particularly suitable for Büchner filtrations where it is desirable to recover the precipitate from the filter surface after filtration. Other characteristics include high wet strength and chemical resistance which are similar to the acid hardened ashless filter papers.
Hardened ashless grades: Quantitative filter papers with 0.006% ash maximum featuring high wet strength and chemical resistance. These papers are acid hardened, which reduces ash to an extremely low level. Their tough surfaces make them suitable for a wide range of critical analytical filtration operations. Each grade offers a convenient combination of filtration speed and particle retention.
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Additional Product Details
Specifications for Product Family
Specifications
- Catalog No:
- 28297-370
- 28297-372
- 28297-374
- Thickness:
- 160 µm (typical)
- 160 µm (typical)
- 160 µm (typical)
- Particle retention:
- 8 µm
- 8 µm
- 8 µm
- Filtration speed:
- 200 s (Herzberg)
- 200 s (Herzberg)
- 200 s (Herzberg)
- Ash content:
- <0.005%
- <0.005%
- <0.005%
- Airflow rate:
- 13 s/100 ml/in²
- 13 s/100 ml/in²
- 13 s/100 ml/in²
- Basis weight:
- 85 g/m²
- 85 g/m²
- 85 g/m²
- Flow rate:
- Medium
- Medium
- Medium
Specifications
Product Family Options
Product Information
- GradeØMaterialTypeAvailabilityPrice
- 28297-370General lab filter paper, circles (100 pieces)General lab filter paper, circles (100 pieces)Grade 540110 mmHigh-quality cotton lintersHardened AshlessLog in for availabilityPaquete de 100$2,539.69Supplier Number: 1540-110Specifications:Product available on GSA Advantage®
More
Specifications
Cat. No.28297-370Thickness160 µm (typical)Particle retention8 µmFiltration speed200 s (Herzberg)Ash content<0.005%Airflow rate13 s/100 ml/in²Basis weight85 g/m²Flow rateMediumProduct available on GSA Advantage® - 28297-372General lab filter paper, circles (100 pieces)General lab filter paper, circles (100 pieces)Grade 540125 mmHigh-quality cotton lintersHardened AshlessLog in for availabilityPaquete de 100$2,919.96Supplier Number: 1540-125Specifications:Product available on GSA Advantage®
More
Specifications
Cat. No.28297-372Thickness160 µm (typical)Particle retention8 µmFiltration speed200 s (Herzberg)Ash content<0.005%Airflow rate13 s/100 ml/in²Basis weight85 g/m²Flow rateMediumProduct available on GSA Advantage® - 28297-374General lab filter paper, circles (100 pieces)General lab filter paper, circles (100 pieces)Grade 540150 mmHigh-quality cotton lintersHardened AshlessLog in for availabilityPaquete de 100$4,127.47Supplier Number: 1540-150Specifications:Product available on GSA Advantage®
More
Specifications
Cat. No.28297-374Thickness160 µm (typical)Particle retention8 µmFiltration speed200 s (Herzberg)Ash content<0.005%Airflow rate13 s/100 ml/in²Basis weight85 g/m²Flow rateMediumProduct available on GSA Advantage®
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