硬化低灰滤纸（灰分<0.025%）经强酸处理具有高湿强度和化学抗性。这些滤纸特别适用于布氏漏斗过滤。其坚韧光滑的表面易于回收沉淀物。
Grade 50: 2.7 µm
Whatman滤纸中的一种。流速慢、颗粒保留性能好。硬化的表面有效的防止了纤维的脱落。
Grade 52: 7 µm
常规过滤用硬化滤纸，保留能力和流速中等。用于布氏漏斗货Whatman三件套过滤漏斗。表面非常光滑。
Grade 54: 22 µm
适应于粗颗粒和凝胶状沉淀物的快速过滤。高湿强度适合于真空快速抽滤难虑物质。
| Typical Properties - Quantitative Hardened Low Ash Grades | ||||||
| Grade | Description | Particle Retention in Liquid (µm) | Filtration Speed Herzberg (s) | Ash Content* | Typical Thickness (µm) | Basis Weight (g/m2) |
| 50 | Slow | 2.7† | 2685 | 0.015 | 115 | 97 |
| 52 | Medium | 7† | 235 | 0.015 | 175 | 101 |
| 54 | Very fast | 22† | 39 | 0.015 | 185 | 92 |
* Ash is determined by ignition of the cellulose filter at 900°C in air
† Particle retention rating at 98% efficiency
| Ordering Information - Quantitative Filter Papers - Hardened Low Ash Grades | ||
| Catalog Number | Description | |
| ||
| 1450-042 | Grade 50 circles, 42.5 mm 100/pk | |
| 1450-050 | Grade 50 circles, 50 mm 100/pk | |
| 1450-055 | Grade 50 circles, 55 mm 100/pk | |
| 1450-070 | Grade 50 circles, 70 mm 100/pk | |
| 1450-090 | Grade 50 circles, 90 mm 100/pk | |
| 1450-110 | Grade 50 circles, 110 mm 100/pk | |
| 1450-125 | Grade 50 circles, 125 mm 100/pk | |
| 1450-150 | Grade 50 circles, 150 mm 100/pk | |
| 1450-185 | Grade 50 circles, 185 mm 100/pk | |
| 1450-240 | Grade 50 circles, 240 mm 100/pk | |
| 1450-320 | Grade 50 circles, 320 mm 100/pk | |
| 1450-400 | Grade 50 circles, 400 mm 100/pk | |
| 1450-500 | Grade 50 circles, 500 mm 100/pk | |
| 1450-561 | Grade 50 circles, 609.6 mm 100pk | |
| 1450-880 | Grade 50 sheets, 10 x 10 inches 100/pk | |
| 1450-916 | Grade 50 sheets, 150 x 230 mm 100/pk | |
| 1450-925 | Grade 50 sheets, 400 x 400 mm 100/pk | |
| 1450-900 | Grade 50 sheets, 410 x 400 mm 100/pk | |
| 1450-917 | Grade 50 sheets, 460 x 570 mm 100/pk | |
| 1450-993 | Grade 50 sheets, white smear tab 100/pk | |
| ||
| 1452-070 | Grade 52 circles, 70 mm 100/pk | |
| 1452-090 | Grade 52 circles, 90 mm 100/pk | |
| 1452-110 | Grade 52 circles, 110 mm 100/pk | |
| 1452-125 | Grade 52 circles, 125 mm 100/pk | |
| 1452-150 | Grade 52 circles, 150 mm 100/pk | |
| 1452-240 | Grade 52 circles, 240 mm 100/pk | |
| ||
| 1454-055 | Grade 54 circles, 55 mm 100/pk | |
| 1454-070 | Grade 54 circles, 70 mm 100/pk | |
| 1454-090 | Grade 54 circles, 90 mm 100/pk | |
| 1454-110 | Grade 54 circles, 110 mm 100/pk | |
| 1454-125 | Grade 54 circles, 125 mm 100/pk | |
| 1454-150 | Grade 54 circles, 150 mm 100/pk | |
| 1454-185 | Grade 54 circles, 185 mm 100/pk | |
| 1454-240 | Grade 54 circles, 240 mm 100/pk | |
| 1454-320 | Grade 54 circles, 320 mm 100/pk | |
| 1454-500 | Grade 54 circles, 500 mm 100/pk | |
| 1454-917 | Grade 54 sheets, 460 x 570 mm 100/pk | |
| Supporting Documentation - Quantitative Filter Papers - Hardened Low Ash Grades |
| Document Name |
 Filtration Simplified |
| Quantitative Filter Paper Quick Pick Reference Chart |
| Typical Properties of Cellulose Filters |
| Typical Properties S&S Quantitative Filters |
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