Filter Papers - Grading and Classification

Standard Grades

  • Merlin Scientific Qualitative filter papers are manufactured from high-quality cotton linters, ensuring quality, re-producibility and uniformity. With average 0.1% ash content. Qualitative filter papers are used for analytical and routine analyses, when no gravimetric analyses are required. A wide range of retention/flow rate combinations matches numerous laboratory applications.The filter paper approved by certificate of CE.

Features

  • * Supply in Slow, Medium and Fast flow rate
  • * 55, 70, 90, 110, 125, 150, 180, 185, 240, 320,400mm diameter or OEM size in available
  • * Ideal for analytical and routine analyses

Grade Comparison

Merlin Scientific

BIO-1

BIO-2

BIO-4

BIO-5

BIO-6

Whatman

Grade 1

Grade 2

Grade 4

Grade 5

Grade 6

Advantec

 2

 232

 1

 235

131

Munktell

No.1/1F

 No.2/150

1288/3

293/120H

1290/1001

Ahlstrom

601

642

631

610

950

Macherey Nagel

616

616md

1670

619eh

619eh

 

Technical Data

Grade

Particle

Retention

Product

Appearance

Filtration Speed

Ash Content

(%)

Basis Weight

(g/m2)

Wet Burst

(mm H2O)

BIO-1

11μm

Smooth

Medium

<0.1

84

>140

BIO-2

8μm

Smooth

Medium

<0.1

84

>140

BIO-4

20μm

Smooth

Fast

<0.1

84

>120

BIO-5

2.5μm

Smooth

Slow

<0.1

84

>180

BIO-6

3.0μm

Smooth

Slow

<0.1

84

>180

 

Applications

  • Qualitative filter paper covers a wide range of laboratory applications and frequently used for clarifying liquids.
  • Soil analysis and seed testing procedures in agriculture
  • Separate solid foodstuffs from associated liquid or extracting liquid in food industry
  • Widely used in education for teaching simple qualitative analytical separations
  • Use circles collect atmospheric dust from air flow in air pollution monitoring

  

Wet Strengthened Grades

Wet-strengthened filter papers are mainly used in normal liquid clarification when filtration is performed under pressure or vacuum and a standard filter is easy to break. These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin. Their use in normal qualitative applications will not introduce any significant impurities into the filtrate. The resins do, however, contain nitrogen so these grades should not be used in applications such as Kjeldahl estimations.

Features

* Widely used to assay sucrose in cane sugar and within pharmaceutical laboratories.

* Full range of diameter: 55, 70, 90, 110, 125, 150, 180, 185, 240,320 and 400mm

* Available from medium and fast flow rate

* Don’t recommend in applications of Kjeldahl estimations.

 

Grade Comparison

Merlin Scientific

BIO-91

BIO-113

Whatman

Grade 91

Grade 113

Advantec

n/a

n/a

Munktell

55/N

6 S/N

Ahlstrom

615

n/a

Macherey Nagel

n/a

n/a

 

Technical Data

Grade

Separating Property

Filtration Seconds

Filtration Speed

Ash Content

(%)

Pore Size

Basis Weight

(g/m2)

Wet Burst

(mm H2O)

BIO-91

PbSO4

>35--<70

Medium

<0.13

10μm

84

>=320

BIO-113

Fe(OH)3

<35s

Fast

<0.13

30μm

68

>=320

 

Quantitative Filter Paper- Ashless Grades (Ash <0.007%)

Merlin Scientific Scientific ashless filter papers are particularly suited for quantitative routine analysis. The ashless quantitative filter paper is made from pure alpha cotton cellulose and double acid washed then rinsed with ultra-pure water to neutralize and good for gravimetric analysis and preparation of samples for instrumental analysis. These filter papers are manufactured under intense quality control standards to be of the highest quality and consistency, ensuring uniform performance so that you can be confident with your results which are as accurate as can be.

 

Features

* Ashless - extremely low ash content <0.007%

* Full range of diameter: 55, 70, 90, 110, 125, 150, 180, 185, 240, 320, 400mm

* Available from slow, medium, fast flow rate

* Good for gravimetric analysis and preparation of samples for instrumental analysis.

 

Grade Comparison

Merlin Scientific

BIO-40

BIO-41

BIO-42

BIO-43

BIO-44

Whatman

Grade 40

Grade 41

Grade 42

Grade 43

Grade 44

Advantec

No. 5B

7

5C

-

6/4A

Munktell

390

00M/389

393/00H

392/00A

391

Ahlstrom

74

-

94

75

95

Macherey

Nagel

640d

640m

640de

640md

640de

 

Technical Data

Grade

Particle

Retention

Product

Appearance

Filtration Speed        

Ash Content

(%)

 Basis Weight

(g/m2)

Wet Burst

(mm H2O)

BIO-40

8.0μm

Smooth

Medium

<0.007

84

>140

BIO-41

20-25μm

Smooth

Fast

<0.007

84

>120

BIO-42

2.5μm

Smooth

Slow

<0.007

84

>180

BIO-43

16μm

Smooth

Medium to Fast

<0.007

84

>140

BIO-44

3μm

Smooth

Slow

<0.007

84

>180

Applications

Quantitative filter paper is suitable for a wide range of critical gravimetric analytical filtration procedures.

- Soil analysis, when separating solid matter from aqueous extracts

- Quantitative determination of milk sediment

- Analysis of constituent components in cements, clays, iron, and steel products

- Inorganic analysis in the construction, mining, and steel industries

- Particle collection for air pollution monitoring for subsequent analysis by X-Ray fluorescence (XRF) techniques