硬化无灰级滤纸（灰分<0.008%）经酸硬化处理，具有高湿强和化学抗性，并且灰分含量极低。坚韧的表面使这类滤纸适用于各种要求严格的过滤步骤。
Grade 540: 8 µm
常规过滤用硬化无灰滤纸，中等的流速和保留颗粒性能。常用于酸性/碱性溶剂中金属物质的比重分析。
Grade 541: 22 µm
过滤速度快，用于酸或者碱性溶液中大颗粒物和胶状沉淀物的过滤。典型的应用有蛋白测定、水泥分析和动物食品中纤维的测定。
Grade 542: 2.7 µm
流速慢、搞强度和优异的化学抗性。可有效保留溶液中对常规滤器有削弱作用的小颗粒。常用于金属比重测定。
| Typical Properties - Quantitative Hardened Ashless Grades | ||||||
| Grade | Description | Particle Retention in Liquid (µm) | Filtration Speed Herzberg (s) | Ash Content+ (%) | Typical Thickness (µm) | Basis Weight (g/m2) |
| 540 | Medium | 8* | 200 | < 0.006 | 160 | 88 |
| 541 | Fast | 22* | 34 | < 0.006 | 155 | 82 |
| 542 | Slow | 2.7* | 2510 | < 0.006 | 150 | 93 |
* Particle Retention Rating at 98% efficiency
| Ordering Information - Quantitative Filter Papers - Hardened Ashless Grades | ||
| Catalog Number | Description | |
| ||
| 1540-321 | Grade 540 Circles, 21 mm 100/pk | |
| 1540-324 | Grade 540 Circles, 24 mm 100/pk | |
| 1540-042 | Grade 540 Circles, 42.5 mm 100/pk | |
| 1540-055 | Grade 540 Circles, 55 mm 100/pk | |
| 1540-070 | Grade 540 Circles, 70 mm 100/pk | |
| 1540-090 | Grade 540 Circles, 90 mm 100/pk | |
| 1540-110 | Grade 540 Circles, 110 mm 100/pk | |
| 1540-125 | Grade 540 Circles, 125 mm 100/pk | |
| 1540-150 | Grade 540 Circles, 150 mm 100/pk | |
| 1540-185 | Grade 540 Circles, 185 mm 100/pk | |
| 1540-240 | Grade 540 Circles, 240 mm 100/pk | |
| 1540-270 | Grade 540 Circles, 270 mm 100/pk | |
| 1540-320 | Grade 540 Circles, 320 mm 100/pk | |
| ||
| 1541-042 | Grade 541 Circles, 42.5 mm 100/pk | |
| 1541-047 | Grade 541 Circles, 47 mm 100/pk | |
| 1541-055 | Grade 541 Circles, 55 mm 100/pk | |
| 1541-070 | Grade 541 Circles, 70 mm 100/pk | |
| 1541-085 | Grade 541 Circles, 85 mm 100/pk | |
| 1541-090 | Grade 541 Circles, 90 mm 100/pk | |
| 1541-110 | Grade 541 Circles, 110 mm 100/pk | |
| 1541-125 | Grade 541 Circles, 125 mm 100/pk | |
| 1541-150 | Grade 541 Circles, 150 mm 100/pk | |
| 1541-185 | Grade 541 Circles, 185 mm 100/pk | |
| 1541-240 | Grade 541 Circles, 240 mm 100/pk | |
| 1541-270 | Grade 541 Circles, 270 mm 100/pk | |
| 1541-320 | Grade 541 Circles, 320 mm 100/pk | |
| 1541-400 | Grade 541 Circles, 400 mm 100/pk | |
| 1541-917 | Grade 541 Sheets, 460 x 570 mm 100/pk | |
| ||
| 1542-055 | Grade 542 Circles, 55 mm 100/pk | |
| 1542-070 | Grade 542 Circles, 70 mm 100/pk | |
| 1542-090 | Grade 542 Circles, 90 mm 100/pk | |
| 1542-110 | Grade 542 Circles, 110 mm 100/pk | |
| 1542-125 | Grade 542 Circles, 125 mm 100/pk | |
| 1542-150 | Grade 542 Circles, 150 mm 100/pk | |
| 1542-185 | Grade 542 Circles, 185 mm 100/pk | |
| 1542-240 | Grade 542 Circles, 240 mm 100/pk | |
| 1542-400 | Grade 542 Circles, 400 mm 100/pk | |
| Supporting Documentation - Quantitative Filter Papers - Hardened Ashless 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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