Quantitative Filter Paper, 90 mm dia, Cotton Linters, Grade 44

Cytiva's Whatman™ Grade 44 quantitative paper is a thin version of Grade 42 ashless paper. The thinness reduces the overall ash content, making Grade 44 well suited for analyses relying on ash-free dry weight. Fast gravimetric analysis of fine particles: Gravimetric analysis can be time-consuming when filtration of fine particles is required. Because of its reduced thickness, Grade 44 ashless filter paper from Cytiva provides faster filtration of fine particles when compared with thicker papers of similar retention rating, such as Whatman™ Grade 42 paper.

Diameter	:	90 mm
Grade	:	Grade 44
Material	:	High-quality Cotton Linters
Ash Content	:	0.007%
Sterility	:	Non-sterile
Grade Type	:	Ashless
Type	:	Quantitative
Dry Burst Pressure	:	117 kPa/17 psi
Dry Burst Pressure	:	200 kPa/29 psi
Filtration Speed	:	995 sec/100 ml (Herzberg)
Format	:	Circle
Nominal Air Flow Rate	:	56 sec/100 ml/in2
Nominal Basis Weight	:	80 g/m2
Particle Retention in Liquid	:	3 µm
Properties	:	Slow to Medium
Thickness	:	176 µm
Typical Water Flow Rate	:	11 ml/min
Wet Burst Pressure	:	2 kPa/0.29 psi
Alpha Cellulose Content	:	=98%
Loading Capacity	:	N

Accurate ash free dry mass measurementsFine nominal particle retention rating of 3 µmFiltration speed (Herzberg 995 s)Typical thickness of 180 µmDesigned for gravimetric analysis and the preparation of samples for instrumental analysis