Quantitative (Ashless) Filter Papers

Composition- Made from the highest quality alpha cotton cellulose.

One critical step in the manufacture of these filter paper is acid washing.

Paper are either single acid washed in hydrochloric acid or double acid washed in hydrochloric acid and then hydrofluoric acid to further reduce levels of SiO2,CaO and Fe2O3. Following the acid wash, all papers are washed with ultrapure water to normalise them.

Number 400 R: This is double acid washed paper for retaining medium size (5 -10 µm) precipitates. e.g. CaCO3, PbSO4, CaCO4, MnCo3, ZnCo3, ZnS, CuS, NO2, AgCl.

Number 410 R: This is double acid washed paper to retain coarse particles and gelatinous precipitates (≥ 10 µm) with high flow rates. Recommended for filtering hydroxides , metallic aerosols and determining silica content in steel. Grade 410 is primarily used in metallurgical laboratories for filtering Fe (OH)3,Cr(OH)3,SiO2 and for environmental monitoring.

Number 420 R: A double washed paper with slow flow rate and high retention efficiency. Recommended for collecting particles ≤5 µm . Gravimetric analysis and for collecting precipitates that tend towards colloidal dispersion.

Number 400 R:

Used in environmental monitoring, particularly in Air Pollution
Used in determination of Silica contents in steel
Filtration hydroxides (Iron or Aluminium) and Metallic aerosols or gelatinous.

Number 410 R:

Used in environmental monitoring, particularly in air pollution
Filtration hydroxides (Iron or Aluminium) and metallic aerosols or gelatinous

Number 420 R:

Used in gravimetric analysis
Filtration of colloidal solutions
Used in typical analytical preciprates include barium sulphate (BaSo4 ) Metastannic acid and finely precipitated calcium Carbonate. (CaCo3).

Parameters	400 R	410 R	420 R
Particle Retention	8 µm	20-25 µm	2.5 µm
GSM (g/m2)	86	81	98
Thickness	160 ± 10 µm	150 ± 10 µm	160 ± 10 µm
Bubble Point	2.5 psi	3 psi	4.5 psi
Capillary Rise (mm/min)	16 mm	19 mm	18 mm
Herzberg Water Flow (sec/ 100 ml)	108 sec	165 sec	3625 sec
Wet Strength	350 gr.	340 gr.	470 gr.
pH (Surface)	5	5.5	5
Ash Content	0.01%	0.01%	0.01%

Qualitative Filter Papers - R Series - Grade 40

Cat No.	Size	Nos/Pkt.	Nos/Pkt. std. box
400012R (Ideal for Blaine's Apparatus used for Cement Sample testing)	127 mm Circles	100	1
400070 R	70 mm Circles	100	1
400090 R	90 mm Circles	100	1
400110 R	110 mm Circles	100	1
400125 R	125 mm Circles	100	1
400150 R	150 mm Circles	100	1
400465 R	460 X 570 mm Sheet	100	5

Qualitative Filter Papers - R Series - Grade 41

Cat No.	Size	Nos/Pkt.	Nos/Pkt. Std. box
410090 R	90 mm Circles	100	1
410110 R	110 mm Circles	100	1
410125 R	125 mm Circles	100	1
410150 R	150 mm Circle	100	1
410185 R	185 mm Circle	100	1
410465 R	460 X 570 mm Sheet	100	5

Qualitative Filter Papers - R Series - Grade 42

Cat No.	Size	Nos/Pkt.	Nos/Pkt. Std. box
420055 R	55 mm Circles	100	1
420090 R	90 mm Circles	100	1
420110 R	110 mm Circles	100	1
420125 R	125 mm Circle	100	1
420150 R	150 mm Circle	100	1
420465 R	460 X 570 mm Sheet	100	5

Hardened Ashless Filter Paper - R Series - Grade 54

Cat No.	Size	Nos/Pkt.	Nos/Pkt. Std. box
540110 R	110 mm Circles	100	1
540125 R	125 mm Circles	100	1
540150 R	150 mm Circles	100	1

Hardened Ashless Filter Paper - R Series 22µm - Grade 541

Cat No.	Size	Nos/Pkt.	Nos/Pkt. Std. box
541110 R	110 mm Circles	100	1
541125 R	125 mm Circles	100	1
541150 R	150 mm Circles	100	1
541465 R	460 X 570 mm Sheet	100	5

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Quantitative (Ashless) Filter Papers

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