Qualitative Filter Papers - Wet Strengthened Grades 湿强定性滤纸
Whatman湿强定性滤纸含有少量的化学稳定树脂，因而增强了湿强度。这不会因此引入任何明显的杂志到滤液中。但因树脂含氮，这些级别的滤纸不能用于凯氏定氮测定。
Grade 91：10μm。普通皱纹纸。广泛用于甘蔗的蔗糖（含量）分析和药厂实验室常规样品过滤。
Grade 113：30μm。高载力。与其他滤纸相比厚度强度流速的皱纹纸。是过滤粗制品或凝胶状沉淀物的理想产品。
Grade 114：25μm。厚度是Grade 113的一半。但强度非常高的滤纸。表面光洁。易于沉淀物的收集。适合粗制品或凝胶状沉淀物的过滤。
Grade 2294：8-15μm。高湿强度而非常厚的滤纸，流速非常快，粗糙颗粒的保留力中等。
Grade 2589a：6-12μm。高湿强度中等保留度。中至高流速。
Grade 93：为教学而设计的，这种滤纸的流速和保留力介于1号和4号纸之 间。学生级截留那些大多数经常载学生实验室中遇到的絮凝状的中等沉淀物。
Grade 520a:15-18μm。薄滤纸，有很好的湿强度和非常高的流速。通常用于技术应用方面，如粘性液体和乳状液体（如甜汁、饮料和糖浆、松脂溶液、石油或植物提取物）。已折叠好的为Grade 520a 1/2。
Grade 1573：12-25μm。快流速高湿强度，有一个非常光滑的表面，能容易清除沉淀物。能抗硫酸和硝酸（浓度高达40%，50℃）、盐酸（浓度10%，100℃；浓度20%，60℃；浓度25%，20℃）和碱（浓度最多10%，20℃）。已折叠好的为 Grade 1573 1/2。
Grade 1575:<2μm。慢流速高湿强度。与Grade 1573相类似。
| Typical Properties - Qualitative Wet Strengthened Grades | ||||||
| Grade | Description | Particle retention in liquid (µm) | Filtration speed (approx.) herzberg (s) | Air flow (s/100 ml/in2) | Typical thickness (µm) | Basis weight (g/m2) |
| 91 | Creped | 10* | 70 | 6.2 | 205 | 71 |
| 93 | Medium | 10* | 80 | 7 | 145 | 67 |
| 113 | Fast, creped | 30* | 28 | 1.3 | 420 | 125 |
| 114 | Fast, smooth | 25* | 38 | 5.3 | 190 | 77 |
| 588 | Fast | - | - | - | 205 | 80 |
| 1573 | Fast, smooth | 12 to 25† | 25 | - | 170 | 88 |
| 1575 | Slow | < 2† | 700 | - | 140 | 92 |
| * Particle retention rating at 98% efficiency † Approximate values | ||||||
| Ordering Information - Qualitative Filter Papers - Wet Strengthened Grades | ||
| Catalog Number | Description | |
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| 1091-110 | Grade 91 circles, 110 mm, 4000/pk (Subdivided into 100) | |
| 1091-125 | Grade 91 circles, 125 mm, 4000/pk (Subdivided into 100) | |
| 1091-150 | Grade 91 circles, 150 mm, 1000/pk (Subdivided into 100) | |
| 1091-165 | Grade 91 circles, 165 mm, 1000/pk (Subdivided into 100) | |
| 1091-185 | Grade 91 circles, 185 mm, 1000/pk (Subdivided into 100) | |
| 1091-190 | Grade 91 circles, 190 mm, 1000/pk (Subdivided into 100) | |
| 1091-240 | Grade 91 circles, 240 mm, 1000/pk (Subdivided into 100) | |
| 1091-500 | Grade 91 circles, 500 mm, 100/pk | |
| 1091-920 | Grade 91 sheets, 480 x 480 mm, 500/pk | |
| 1091-930 | Grade 91 sheets, 580 x 580 mm, 500/pk | |
| 1091-935 | Grade 91 sheets, 610 x 610 mm, 500/pk | |
| 1091-902 | Grade 91 sheets, 730 x 1280 mm, 100/pk | |
| 1091-903 | Grade 91 sheets, 790 x 1280 mm, 100/pk | |
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| 1093-110 | Grade 93 circles, 110 mm, 100/pk | |
| 1093-111 | Grade 93 circles, 110 mm, 1250/pk, (50 envelopes of 25 circles) | |
| 1093-125 | Grade 93 circles, 125 mm, 100/pk | |
| 1093-126 | Grade 93 circles, 125 mm, 1250/pk (50 envelopes of 25 circles) | |
| 1093-6212 | Grade 93 circles, 125 mm, 4000/pk (40 bags of 100 circles) | |
| 1093-6215 | Grade 93 circles, 150 mm, 1000/pk (10 bags of 100 circles) | |
| 1093-930 | Grade 93 sheets, 580 x 580 mm, 500/pk | |
| 1093-935 | Grade 93 sheets, 610 x 610 mm, 500/pk | |
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| 1113-110 | Grade 113 circles, 110 mm, 100/pk | |
| 1113-090 | Grade 113 circles, 90 mm, 100/pk | |
| 1113-125 | Grade 113 circles, 125 mm, 100/pk | |
| 1113-150 | Grade 113 circles, 150 mm, 100/pk | |
| 1113-185 | Grade 113 circles, 185 mm, 100/pk | |
| 1113-240 | Grade 113 circles, 240 mm, 100/pk | |
| 1113-320 | Grade 113 circles, 320 mm, 100/pk | |
| 1113-500 | Grade 113 circles, 500 mm, 100/pk | |
| 1113-917 | Grade 113 sheets, 460 x 570 mm, 100/pk | |
| 1113-991 | Grade 113 sheets, 490 x 1000 mm, 100/pk | |
| 1600-113 | FilterCup (requires FilterCup stem, catalog number 1600-900), 25/pk | |
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| 1114-090 | Grade 114 circles, 90 mm, 100/pk | |
| 1114-125 | Grade 114 circles, 125 mm, 100/pk | |
| 1114-150 | Grade 114 circles, 150 mm, 100/pk | |
| 1114-185 | Grade 114 circles, 185 mm, 100/pk | |
| 1114-240 | Grade 114 circles, 240 mm, 100/pk | |
| 1114-270 | Grade 114 circles, 270 mm, 100/pk | |
| 1114-400 | Grade 114 circles, 400 mm, 100/pk | |
| 1114-930 | Grade 114 sheets, 580 x 580 mm, 100/pk | |
| 1114-935 | Grade 114 sheets, 580 x 580 mm, 500/pk | |
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| Grade 588 circles, 240 mm, 100/pk | ||
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| Grade 1573 circles, 125 mm, 100/pk | ||
| Grade 1573 circles, 150 mm, 100/pk | ||
| Grade 1573 circles, 185 mm, 100/pk | ||
| Grade 1573 circles, 240 mm, 100/pk | ||
| Grade 1573 circles, 290 mm, 100/pk | ||
| ||
| Grade 1575 circles, 125 mm, 100/pk | ||
| Grade 1575 circles, 150 mm, 100/pk | ||
| Grade 1575 circles, 185 mm, 100/pk | ||
| Grade 1575 circles, 200 mm, 100/pk | ||
| Grade 1575 circles, 510 mm, 100/pk | ||
| Grade 1575 sheets, 400 x 400 mm, 500/pk | ||
| Grade 1575 sheets, 1100 x 1100 mm, 100/pk | ||
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| 1600-900 | FilterCup stem, 1/pk | |
| Supporting Documentation - Qualitative Filter Papers - Wet Strengthened Grades |
| Document Name |
 Filtration Simplified |
| Qualitative Filter Paper Quick Pick Reference Chart |
| Typical Properties of Cellulose Filters |
| Typical Properties of Wet Strengthened Filters |
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