Filter Papers
Quantitative filter papers - Hardened Ashless Grades
Filter Papers
Quantitative filter papers - Hardened Ashless Grades
Hardened ashless filter papers are suited for a variety of precipitate sizes. Along with general filtration Grade 540, the range includes Grade 542 for retention of fine precipitates and Grade 541 for fast filtration. All three grades are designed for use in gravimetric analysis.
These filter papers exhibit high wet strength and chemical resistance and 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.
Whatman™ quantitative filters are designed for gravimetric analysis and the preparation of samples for instrument analysis. They are available in three formats designed for specific requirements.
0.005% ash nominal, acid hardened to give high wet strength and chemical resistance with
extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.
Product Info
Applications
Grade 540 (8 μm*)
A general purpose hardened ashless filter paper with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali. Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis.
Grade 541 (22 μm*)
The general purpose hardened filter paper with medium retention and flow rate. Very hard surface.
Grade 542 (2.7 μm*)
High retention of fine particles under demanding conditions. Slow flow rate. Very hard and strong with excellent
chemical resistance. Often used in gravimetric metal determinations.
* Particle retention rating at 98% efficiency
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Whatman™ Price List 2021
| Cat. Nos | Description | MRP INR | |||
|---|---|---|---|---|---|
| 1540-321 | GR 540 2.1CM 100/PK | 2810 | |||
| 1540-324 | GR 540 2.4CM 100/PK | 2770 | |||
| 1540-042 | GR 540 4.25CM 100/PK | 2510 | |||
| 1540-055 | GR 540 5.5CM 100/PK | 2690 | |||
| 1540-090 | GR 540 9CM 100/PK | 3510 | |||
| 1540-110 | GR 540 11CM 100/PK | 4870 | |||
| 1540-125 | GR 540 12.5CM 100/PK | 5430 | |||
| 1540-150 | GR 540 15CM 100/PK | 7930 | |||
| 1540-185 | GR 540 18.5CM 100/PK | 13250 | |||
| 1540-240 | GR 540 24CM 100/PK | 22130 | |||
| 1540-320 | GR 540 32CM 100/PK | 47480 | |||