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 FILTER PAPERS AND THIMBLES
Click on the following links for information on each product:
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Qualitative Filter Papers |
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Qualitative filter paper for precipitate removal and qualitative analysis preparation:
| Made of 100% alpha cotton cellulose; Ash content 0.1% |
| Stable from pH 0 ~ 12; thermostable up to 120°C |
| Contact us for more information on this line of products, including conversions to other manufacturers' products. |
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| Type |
Applications/Comments |
Weight
(g/m2) |
Thickness
(mm) |
Retention Characteristics
(μm) |
Collection Efficiency
(%, 0.3μm DOP) |
| No. 1 |
Retains large crystalline particles and gelatinous precipitates. Fast flow rate, smooth surface, normal hardness. |
90 |
0.20 |
Coarse (6) |
65 |
| No. 2 |
Retains medium crystalline particles. Fast flow rate, smooth surface, normal hardness. |
125 |
0.26 |
Medium (5) |
80 |
| No. 231 |
Retains crystalline particles. Moderate flow rate, smooth surface, normal hardness. |
95 |
0.18 |
Medium |
- |
| No. 232 |
Retains medium to medium-fine particles. Slow flow rate, smooth surface, normal hardness. |
90 |
0.18 |
Medium/ Medium Fine |
- |
| No. 131 |
High retention efficiencey for fine particles, like barium sulfate. Slow flow rate, smooth surface, normal hardness. |
140 |
0.25 |
Medium-Fine (3) |
90 |
| No. 235 |
Highest retention efficiency, retaining very fine particles. Very slow flow rate, smooth surface, normal hardness. |
95 |
0.17 |
Very Fine |
- |
| No. 101 |
Seed germination; retains large particles. |
80 |
0.21 |
Coarse and Gelatinous (6-7) |
- |
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Quantitative Filter Papers |
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Quantitative filter paper for gravimetric analysis or environmental monitoring:
| Made of Highest quality alpha cotton cellulose; "Ashless" (Ash content 0.01%) |
| Acid washed and rinsed with ultrapure water to neutralize |
| Contact us for more information on this line of products, including conversions to other manufacturers' products. |
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| Type |
Applications/Comments |
Weight
(g/m2) |
Thickness
(mm) |
Retention Characteristics (μm) |
Collection Efficiency
(%, 0.3μm DOP) |
| No. 3 Ashless |
Retains medium particles, fast flow rate. For analysis of soils, fertilizers, cement, and minerals. |
113 |
0.23 |
Medium (5-10) |
80 |
| No. 5A Ashless |
Retains coarse particles and gelatinous precipitates, fast flow rate. For filtration of hydroxides, metallic aerosols, environmental monitoring, silica content determination in steel. |
97 |
0.22 |
Coarse and Gelatinous (>10) |
75 |
| No. 5B Ashless |
Retains medium particles, such as CaCO3, CaCO4, PbSO4, MnCO3, ZnCO3, ZnS, AgCl |
108 |
0.21 |
Medium (5-10) |
90 |
| No. 5C Ashless |
Retains fine particles, such as SrSO4, BaSO4, HgCrO4, and collodial dispersions. Filter for general gravimetric analysis. |
118 |
0.22 |
Fine (<5) |
93 |
| No. 6 Ashless |
Retains medium-fine particles, trace, and precious metals. |
103 |
0.20 |
Medium-Fine (2-10) |
90 |
| No. 7 Ashless |
Highest purity for retaining medium particles. Filter for precise gravimetric analysis. |
87 |
0.18 |
Medium (5-10) |
85 |
| No. 4A Hardened Ashless |
Retains fine particles, slow flow rate. High wet strength, suitable for use under high pressure, with good pH and chemical resistance. |
96 |
0.12 |
Very Fine (<5) |
90 |
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Phase Separating Filter Papers |
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Hydrophobic filter paper for aqueous/non-aqueous separation:
| Available as Silicon-treated Cellulose PTFE |
| Both available in sheets and disks |
| Contact us for more information on this line of products. |
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| Type |
Filter Material |
Weight
(g/m2) |
Thickness
(mm) |
Nominal Rating (μm) |
Collection Efficiency
(%, 0.3μm DOP) |
| 2S |
Silicone-treated Cellulose |
120 |
0.26 |
5 |
- |
| PF020 |
PTFE |
500 |
0.54 |
2 |
99.9 |
| PF040 |
PTFE |
500 |
0.95 |
4 |
95 |
| PF050 |
PTFE |
210 |
0.36 |
5 |
85 |
| PF060 |
PTFE |
240 |
0.50 |
6 |
75 |
| PF100 |
PTFE |
500 |
1.00 |
10 |
70 |
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Extraction Thimbles |
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Thimble filters useful for a variety of analytical procedures:
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No. 84 - Cellulose Thimbles: Suitable for Soxhlet type extractions or dust sampling. Lipid content <0.1% by weight. |
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No. 86R - Glass Fiber Thimbles: Made of strong borosilicate glass fibers, resitant to high temperatures 500°C and most acids. |
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No. 88R, 88RH - Silica Fiber Thimbles: Made of quartz fibers, resitant to 1000°C. Tapered for easy stack sampler loading. |
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No. 89, 895 - PTFE Fiber and PTFE/Silica Fiber Thimbles: Durable, temperature-resistant thimbles with minimal trace metals. |
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Contact us for more information on this line of products, including conversions to other manufacturers' products. |
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| Type |
Filter Material |
Weight
(g/m2) |
Thickness
(mm) |
Nominal Rating (μm) |
Collection Efficiency
(%, 0.3μm DOP) |
| 84 |
Cellulose |
3.6 |
1.5 |
8 |
89 |
| 86R |
Borosilicate Glass Fiber |
1.8 |
1.6 |
1 |
>99.9 |
| 88R |
Quartz/Silica Fiber |
2.2 |
1.6 |
- |
>99.9 |
| 88RH |
Quartz/Silica Fiber |
2.2 |
1.6 |
- |
>99.9 |
| 89 |
PTFE Fiber |
11.0 |
1.8 |
- |
>99.9 |
| 89S |
PTFE-Silica Fiber |
6 |
1.6 |
- |
>99.9 |
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Membranes
Qualitative Filter Papers