Details
Quantitative/Hardened Filter Papers
- 100% cotton linter cellulose
- Ash Content: 0.01%(Except No.4A 0.025%)
- Acid washed: Double acid washed in hydrochloric then hydrofluoric acid (No. 3, 5A, 5B, 5C, 6), then rinsed with ultrapure water to neutralize. No. 4A is further treated with nitric acid before washing
APPLICATIONS
- Gravimetric analysis
- Environmental monitoring
CHARACTERISTICS AND APPLICATIONS: CONVERSIONS – QUANTITATIVE PAPERS
Grade |
Comments |
Weight (g/m2) |
Thickness (mm) |
Flow Time*1 (sec) |
Absorption speed*2 (cm) |
Wet Strength*3 (kPa) |
Nominal Rating (µm) |
Collection Efficiency (%, 0.3
|
Conversion*4 |
|
Whatman |
ex-Schleicher & Schuell |
|||||||||
|
No. 3
Ashless |
Medium retention (5-10 µm), fast flow rate Analysis of soils, fertilizers, cement, and minerals
|
113
|
0.23
|
130
|
7.5
|
12
|
5
(Medium) |
80
|
43
|
593-A
|
|
No. 5A
Ashless |
Fast flow rate, retains coarse particulates and gelatinous precipitates (>10 µm). Filter hydroxides and metallic aerosols, environmental monitoring, determine silica content in steel
|
97
|
0.22
|
60
|
9.5
|
10
|
7
(Coarse and gelatinous) |
75
|
41
|
589-IH
|
|
No. 5B
Ashless |
Retains medium particles (5-10 µm) such as CaCO3, PbSO4, CaCO4, MnCO3, ZnCO3, ZnS, AgCl
|
108
|
0.21
|
195
|
7.0
|
12
|
4
(Medium) |
90
|
40
|
589 / 6
Green |
|
No. 5C
Ashless |
Collect fine precipitates (<5 µm) such as SrSO4, BaSO4, HgCrO4, and colloidal dispersions; gravimetric analysis
|
118
|
0.22
|
570
|
6.0
|
12
|
1
(Fine) |
93
|
44
|
589 / 3
Blue |
|
No. 6
Ashless |
Retains medium-fine particulates (2-10 µm), trace and precious metals
|
103
|
0.20
|
300
|
6.0
|
12
|
3
(Medium Fine) |
90
|
-
|
589 / 2
White |
|
No. 7
Ashless |
Highest purity for retaining medium particles (5-10 µm), precise gravimetric analysis
|
87
|
0.18
|
200
|
7.0
|
10
|
4
(Medium) |
85
|
-
|
-
|
|
No. 4A
Hardened |
High wet strength, suitable for use under high pressure, high chemical and pH resistance, retains fine crystalline precipitates (<5 µm), slow flow
|
96
|
0.12
|
915
|
4.0
|
52
|
1
(Very Fine) |
90
|
50
|
-
|
*1. Flow time is the time in seconds required to filter 100 mL of distilled water at 20°C under pressure supplied by a 10 cm water column through a 10 cm2 section of filter paper.
*2. Absorption speed is the distance in cm that water will travel in an upright strip of filter paper in ten (10) minutes at 20°C.
*3. Wet strength is the pressure measured by Mullen Burst Strength Tester after soaking in water.
*4. Conversions between manufacturers are not absolute. Use these conversions as a guideline.
Ash content of Quantitative Papers (mg per disc)
| mm | No. 3 | No. 5A | No. 5B | No. 5C | No. 6 | No. 7 |
| 55 | 0.03 | 0.02 | 0.03 | 0.03 | 0.02 | 0.02 |
| 70 | 0.04 | 0.04 | 0.04 | 0.05 | 0.04 | 0.03 |
| 90 | 0.07 | 0.06 | 0.07 | 0.08 | 0.07 | 0.06 |
| 110 | 0.11 | 0.09 | 0.10 | 0.11 | 0.10 | 0.08 |
| 125 | 0.14 | 0.12 | 0.13 | 0.15 | 0.13 | 0.11 |
| 150 | 0.20 | 0.17 | 0.19 | 0.21 | 0.18 | 0.15 |
| 185 | 0.30 | 0.26 | 0.29 | 0.32 | 0.28 | 0.23 |
Metal Content
| (µg/g) | Si | Na | K | Ca | Mg | Fe | Pb | Cu | Mn | Ni | Al | Zn | Cd |
| Qualitative | 46 | 62 | 3 | 140 | 17 | <5 | <1 | <1 | <1 | <1 | <2 | 1 | <0.5 |
| Quantitative | 32 | <10 | <2 | <10 | <1 | 8 | <1 | <1 | <0.5 | <1 | 2 | <1 | <0.5 |
ORDERING INFORMATION: QUANTITATIVE PAPERS
- Available in discs in the following diameters (mm): 55, 70, 90, 110, 125, 150, 185, 240, 285, 300, 330, 360, 400, 500
- Additional sizes available upon request.
- Order by specifying first the grade of filter then the diameter, e.g. (No.5A, 125 mm), (No.6, 55 mm)
- Package of 100
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