Qualitative Filter Papers

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Qualitative Filter Papers

Qualitative Filter Papers

  • 100% cotton linter cellulose
  • pH tolerant: 0 to 12
  • Thermostable: up to 120°C
  • Wide selection – seven types
  • Ash Content: 0.1%
 

APPLICATIONS

  • Clarify and remove precipitates
  • Preparation for qualitative analysis
 

CHARACTERISTICS AND APPLICATIONS: CONVERSIONS – QUALITATIVE 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
µm DOP)

Conversion*4

Whatman

ex-Schleicher & Schuell

No. 1

Retains large crystalline particles and gelatinous precipitates. Fast flow rate, smooth surface, normal hardness

90

0.20

45

9.0

7

6
(Coarse)

65

4

410
or
1450cv

No. 2

Retains medium crystalline precipitates, fast flow rate, smooth surface, normal hardness

125

0.26

80

8.0

8

5
(Medium)

80

-

604

No. 231

Retains crystalline precipitates, moderate flow rate, smooth surface, normal hardness

95

0.18

130

7.5

-

(Medium)

-

2

-

No. 232

Retains medium to medium- fine particulates, slow flow rate, smooth, normal hardness

90

0.18

250

5.0

-

(Med./ Med.-Fine)

-

6

-

No. 131

High retention efficiency for fine crystalline precipitates like barium sulfate, slow flow rate, smooth surface, normal hardness

140

0.25

240

6.0

8

3
(Med.-Fine)

90

3

597

No. 235

Highest retention efficiency, retains very fine particulates, very slow flow rate, smooth

95

0.17

1,200

4.0

-

(Very Fine)

-

5

-

No. 101

Seed germination, retains large particles

80

0.21

50

8.0

34

5
(Coarse and gelatinous)

-

91

-

*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.

 

ORDERING INFORMATION: QUALITATIVE PAPERS

• Available in discs in the following diameters (mm): 55, 70, 90, 110, 125, 150, 185, 240, 285, 300, 330, 360, 400, 500, 600
• Additional sizes available upon request.
• Order by specifying first the grade of filter then the diameter, e.g. (No.1, 125 mm), (No.232, 55 mm)
• Package of 100



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