Laboratory Filter Paper


filter papers produced by Hawach

laboratory filter paper manufacturer

are divided into two series, qualitative filter paper, and quantitative filter paper. Qualitative filter papers are divided into standard grades and wet strengthened grades. Wet strengthened grades are added a small amount of chemical stabilizer on the basis of the standard grades. Qualitative filter paper ash content is less than 0.1%, and quantitative filter paper ash content is less than 0.007%. Ash content is the biggest difference between qualitative filter paper chemistry lab and quantitative filter paper. As a

filter paper manufacturers

, Hawach has disc and sheet type, regular or customized size, and shape are all available.

Grade comparison provided by laboratory filter paper manufacturer

Qualitative Filter Paper

Hawach 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

Wet Strengthened Grades

Hawach 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

Quantitative Filter Paper

Hawach 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