Quantitative filter papers, ashless grades, grade 42, Whatman™

These filter papers made from high quality cotton linters have the finest retention of all ashless filter paper grades. Grade 42 is designed for gravimetric analysis and sample preparation for instrumental analysis.

Commonly used as a calcium carbonate filter
Alpha cellulose content ≥98%

These filter papers are designed for retention of extremely small particles. Other typical precipitates for gravimetric analysis include barium sulfate and metastannic acid for use in glazes, coatings and pigments. The high purity of these filters also makes them suitable for processes that require ashing.

Catalog No:
WHAT1442-6551
WHAT1442-240
WHAT1442-042
WHAT1442-320
WHAT1442-917
WHAT1442-055
WHAT1442-047
WHAT1442-090
WHAT1442-070
WHAT1442-125
WHAT1442-110
WHAT1442-185
WHAT1442-150

Grade:
42
42
42
42
42
42
42
42
42
42
42
42
42

Weight:
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²
100 g/m²

Thickness:
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm
200 µm

Particle retention:
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm
2,5 µm

Filtration speed:
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)
1870 s (Herzberg)

Ash content:
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%
0,007%

Airflow rate:
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²
96 s/100 ml/6,5 cm²

WHAT1442-110_TDS_EN