Quantitative Filter Paper, 110 mm dia, Cotton Linters, Grade 42

Cytiva's Whatman™ Grade 42 quantitative papers have the finest retention of all Whatman™ ashless filter paper grades. Grade 42 is designed for gravimetric analysis and sample preparation for instrumental analysis. Ashless paper for gravimetric and instrumental analysis: Whatman™ Grade 42 quantitative papers from Cytiva’s Life Sciences business are designed for retention of extremely small particles. A common example is use of Grade 42 as a calcium carbonate filter for analysis in the cement industry. Other typical precipitates for gravimetric analysis include barium sulfate and metastannic acid for use in glazes, coatings, and pigments. The high purity of Cytiva's Grade 42 filters also makes them suitable for processes that require ashing.

Diameter	:	110 mm
Grade	:	Grade 42
Material	:	High-quality Cotton Linters
Ash Content	:	0.007%
Sterility	:	Non-sterile
Grade Type	:	Ashless
Type	:	Quantitative
Dry Burst Pressure	:	172 kPa/25 psi
Filtration Speed	:	1870 sec/100 ml (Herzberg)
Format	:	Circle
Nominal Air Flow Rate	:	96 sec/100 ml/in2
Nominal Basis Weight	:	100 g/m2
Particle Retention in Liquid	:	2.5 µm
Properties	:	Slow
Thickness	:	200 µm
Typical Water Flow Rate	:	5 ml/min
Wet Burst Pressure	:	2.8 kPa/0.40 psi
Alpha Cellulose Content	:	=98%
Loading Capacity	:	N

For Instrumental analysisAshless: 0.007% ash maximumFine (2.5 µm) nominal particle retention rating, eliminates large particles that might otherwise interfere with sensitive instrumentationHerzberg filtration speed of 1870 sCommonly used as a calcium carbonate filterDesigned for gravimetric analysis and the preparation of samples for instrumental analysis, for critical gravimetric analysis with the finest particle retention