Qualitative Filter Papers - Wet Strengthened Grades 濕強定性濾紙
Whatman濕強定性濾紙含有少量的化學穩定樹脂，因而增強了濕強度。這不會因此引入任何明顯的雜志到濾液中。但因樹脂含氮，這些級別的濾紙不能用于凱氏定氮測定。
Grade 91：10μm。普通皺紋紙。廣泛用于甘蔗的蔗糖（含量）分析和藥廠實驗室常規樣品過濾。
Grade 113：30μm。高載力。與其他濾紙相比厚度強度流速的皺紋紙。是過濾粗制品或凝膠狀沉淀物的理想產品。
Grade 114：25μm。厚度是Grade 113的一半。但強度非常高的濾紙。表面光潔。易于沉淀物的收集。適合粗制品或凝膠狀沉淀物的過濾。
Grade 2294：8-15μm。高濕強度而非常厚的濾紙，流速非常快，粗糙顆粒的保留力中等。
Grade 2589a：6-12μm。高濕強度中等保留度。中至高流速。
Grade 93：為教學而設計的，這種濾紙的流速和保留力介于1號和4號紙之 間。學生級截留那些大多數經常載學生實驗室中遇到的絮凝狀的中等沉淀物。
Grade 520a:15-18μm。薄濾紙，有很好的濕強度和非常高的流速。通常用于技術應用方面，如粘性液體和乳狀液體（如甜汁、飲料和糖漿、松脂溶液、石油或植物提取物）。已折疊好的為Grade 520a 1/2。
Grade 1573：12-25μm。快流速高濕強度，有一個非常光滑的表面，能容易清除沉淀物。能抗硫酸和硝酸（濃度高達40%，50℃）、鹽酸（濃度10%，100℃；濃度20%，60℃；濃度25%，20℃）和堿（濃度最多10%，20℃）。已折疊好的為 Grade 1573 1/2。
Grade 1575:<2μm。慢流速高濕強度。與Grade 1573相類似。
| 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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