Qualitative Filter Papers - Wet Strengthened Grades 濕強(qiáng)定性濾紙
Whatman濕強(qiáng)定性濾紙含有少量的化學(xué)穩(wěn)定樹脂，因而增強(qiáng)了濕強(qiáng)度。這不會(huì)因此引入任何明顯的雜志到濾液中。但因樹脂含氮，這些級(jí)別的濾紙不能用于凱氏定氮測(cè)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(shí)驗(yàn)室常規(guī)樣品過濾。
Grade 113：30μm。高載力。與其他濾紙相比厚度強(qiáng)度流速的皺紋紙。是過濾粗制品或凝膠狀沉淀物的理想產(chǎn)品。
Grade 114：25μm。厚度是Grade 113的一半。但強(qiáng)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(qiáng)度而非常厚的濾紙，流速非?？?，粗糙顆粒的保留力中等。
Grade 2589a：6-12μm。高濕強(qiáng)度中等保留度。中至高流速。
Grade 93：為教學(xué)而設(shè)計(jì)的，這種濾紙的流速和保留力介于1號(hào)和4號(hào)紙之 間。學(xué)生級(jí)截留那些大多數(shù)經(jīng)常載學(xué)生實(shí)驗(yàn)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(qiáng)度和非常高的流速。通常用于技術(shù)應(yīng)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?？炝魉俑邼駨?qiáng)度，有一個(gè)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(dá)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(qiáng)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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