Coated (Treated) Filters

SKC offers coated filters to meet a variety of OSHA, NIOSH, ASTM, and international agency methods.

Some chemicals are not effectively trapped by any solid sorbent without special preparation. Chemical coating is carried out on various sorbents to trap aldehydes, nitrogen dioxide, amines and many more compounds. Coated filters make sampling reactive compounds fast and easy. They are a convenient alternative to wet chemistry methods using impingers. Simply unplug the lightweight cassette, insert it into an SKC Filter Cassette Holder, clip holder to a worker’s collar, and attach to a personal sampling pump. Use coated filters to collect compounds that exist as an aerosol or mist or for some higher boiling vapours. Flow rates are typically greater than 1 L/min and sampling times range from 15 minutes to one hour. Most coated filter samples are extracted in solvents and analysed by gas or liquid chromatography.

Ready to use
Time-saving
Convenient alternative to impinger wet chemistry methods
Economical
No assembly required - preloaded into cassettes with end plugs and shrink bands
Meet agency method specifications
No cumbersome collection liquids or glass
Easy personal sampling
Small package size for short shelf-life product

The methods listed are the most widely used. Note also that coated filters have a limited shelf life and are supplied in 37 mm cassettes unless otherwise noted.

Coated Filters in Cassettes

Click on the symbol to view the specific instruction sheet.

Chemical	Method	Filter; Coating	Pack Size	Part Number
Acetic anhydride	OSHA 82	2 Glass fibre filters; 1-(2-pyridyl) piperazine	10	225-9009 §
Acetic anhydride	OSHA 102	2 Glass fibre filters; veratrylamine and di-n-octyl phthalate	10	225-9010 †
4-Aminobiphenyl	OSHA 93	2 Glass fibre filters; sulphuric acid	10	225-9004
Aniline	NIOSH 2017	2 Glass fibre filters; sulphuric acid	10	225-9004 ¥
Arsenic, volatile compounds	OSHA ID-1006	1 MCE filter and plastic pad; untreated and 1 cellulose support pad; sodium carbonate	10	225-9001
Benzidine	OSHA 65	2 Glass fibre filters; sulphuric acid	10	225-9004
Bromine, chlorine	NIOSH 6011	1 25 mm PTFE pre-filter and polypropylene support; 1 25 mm specially cleaned silver membrane and polypropylene support in 25 mm cassette	5	225-9006
Crotonaldehyde	OSHA 81	2 Glass fibre filters; 2,4-dinitrophenylhydrazine and phosphoric acid	10	225-9019 §
o-Dianisidine	OSHA 71	2 Glass fibre filters; sulphuric acid	10	225-9004
3,3-Dichlorobenzidine	OSHA 65	2 Glass fibre filters; sulphuric acid	10	225-9004
Diisocyanates &(HDI;2,6-TDI;2,4-TDI)	ASTM D5836 Δ OSHA 42	1 Glass fibre filter and cellulose support; 1-(2-pyridyl) piperazine	10	225-9013 § †
Diisocyanates &(HDI;2,6-TDI;2,4-TDI)	ASTM D5836 Δ OSHA 42		10	225-9002 § ‡
Diphenylamine	OSHA 78	2 Glass fibre filters; sulphuric acid	10	225-9004
Fluorides	OSHA ID-110 NIOSH 7902 ASTM D4765	1 MCE filter and cellulose pad; sodium carbonate	10	225-9001 #
Fluorides, particulate	NIOSH 7906	2 Nitrocellulose filters; 1 coated with sodium carbonate, 1 uncoated	10	225-9031
Glutaraldehyde	OSHA 64	2 Glass fibre filters; 2,4-dinitrophenyl hydrazine and phosphoric acid	10	225-9003 §
Glyoxal	For IFV	25 mm glass fibre filters; 2,4-dinitrophenylhydrazine (filters only, in jar)	10	225-9036 §
Hexavalent Chromium in Chromium Plating Mist	MDHS 52/4	25mm Polyvinylidine Fluoride Filter; sodium hydroxide (filters only)	24	225-9026
Hydrazine	OSHA 108	2 Glass fibre filters; sulphuric acid	10	225-9012
Hydrofluoric acid	NIOSH 7906	2 Nitrocellulose filters; 1 coated with sodium carbonate, 1 uncoated	10	225-9031
Hydrogen bromide	NIOSH 7907	2 Quartz filters; sulphuric acid; 1 coated with sodium carbonate, 1 uncoated	10	225-9032
Hydrogen chloride	NIOSH 7907	2 Quartz filters; sulphuric acid; 1 coated with sodium carbonate, 1 uncoated	10	225-9032
Hydrogen Peroxide	OSHA 1019	2 25 mm Quartz filters; titanium oxysulphate hydrate in 25 mm cassette	10	225-9030 (OSHA 1019) •
Hydrogen Peroxide	NON 57		10	225-9030 (NON 57) •
Isocyanates	ASTM ∑	1 PTFE filter, 1 Glass filter treated with MAMA (ISO-CHEK Sampling System)	12	225-9022 ∑
Isocyanates	ASTM ∑		36	225-9022A ∑
Isocyanates (HDI;2,6-TDI;2,4-TDI)	ASTM D5836 Δ OSHA 42 ‡	1 Glass fibre filter and cellulose support; 1-(2-pyridyl) piperazine	10	225-9013 § †
Isocyanates (HDI;2,6-TDI;2,4-TDI)	ASTM D5836 Δ OSHA 42 ‡		10	225-9002 § ‡
Isocyanates, organic	MDHS 25/4 (UK)	1 25 mm A/E Glass filter; methoxyphenyl piperazine (filters only)	5	Special Order §
n-Isopropylaniline	OSHA 78	2 Glass fibre filters; sulphuric acid	10	225-9004
Maleic anhydride	OSHA 86	2 Glass fibre filters; veratrylamine	10	225-9021 §
Maleic anhydride	For IFV	1 25 mm Glass fibre filter; veratrylamine (filters only)	10	225-9028 §
Mercaptans (methyl-, ethyl-, n-butyl, and phenyl-)	NIOSH 2542 OSHA 26	1 Glass fibre filter; mercuric acetate	10	225-9007 §
4,4'-Methylene bis (2-chloroaniline) (MOCA)	OSHA 71	2 Glass fibre filters; sulphuric acid	10	225-9004
Methylene bisphenyl (MDI)	OSHA 47	1 Glass fibre filter and cellulose support; 1-(2-pyridyl) piperazine	10	225-9013 § †
Methylene bisphenyl (MDI)	OSHA 47		10	225-9002 § ‡
4,4'-Methylenedianiline	OSHA 57 Ω NIOSH 5029	2 Glass fibre filters; sulphuric acid	10	225-9004
1-Naphthylamine, 2-naphthylamine	OSHA 93	2 Glass fibre filters; sulphuric acid	10	225-9004
Nitric acid	NIOSH 2017	2 Quartz filters; 1 coated with sodium carbonate, 1 uncoated	10	225-9032
Nitrobenzene	NIOSH 2017	2 Glass fibre filters; sulphuric acid	10	225-9004 ¥
Ozone	OSHA ID-214	2 Glass fibre filters; nitrite-impregnated	10	225-9014 §
Peracetic Acid	OSHA PV2321	1 Quartz filters (R-100); titanium oxysulphate hydrate (TiOSO₄) preloaded in 25 mm 2-piece clear cassette	10	225-9037 ♦
Phenylenediamine (o-, m-, p-)	OSHA 87	2 Glass fibre filters; sulphuric acid	10	225-9004
Phosphine	OSHA 1003	1 Glass fibre filter; 1 polyester filter treated with mercuric chloride	10	225-9018 § †
Phosphoric acid	NIOSH 7908	1 Quartz filter	10	225-9033 ♠
Phthalic anhydride	OSHA 90	2 Glass Fibre filters, veratrylamine	10	225-9034 §
Sulphur dioxide	NIOSH 6004 (modified)	1 MCE pre-filter and support/1 cellulose filter and support; sodium carbonate	10	225-9005
Sulphuric acid	NIOSH 7908	1 Quartz filter	10	225-9033 ♠
2,4-Toluendiamine	OSHA 65	2 Glass fibre filters; sulphuric acid	10	225-9004
2,6-Toluendiamine	OSHA 65	2 Glass fibre filters; sulphuric acid	10	225-9004
o-Tolidine	OSHA 71	2 Glass fibre filters; sulphuric acid	10	225-9004
Toluene-2,4-diisocyanate and toluene-2,6-diisocyanate	For IFV	1 25 mmGlass fibre filter and cellulose sopport; 1-(2-pyridl)piperazine (filters only)	10	225-9035 §
o-Toluidine	NIOSH 2017	2 Glass fibre filters; sulphuric acid	10	225-9004 ¥
Toluidine (o-, m-, p-)	OSHA 73	2 Glass fibre filters; sulphuric acid	10	225-9004
1,3,5-Triglycidyl isocyanurate (TGI)	OSHA PV2055	1 Glass fibre filter; hydrobromic acid	10	225-9027
Valeraldehyde	OSHA 85	3 Glass fibre filters; 2,4-dinitrophenylhydrazine and phosphoric acid	10	225-9020 §
m-Xylenediamine (m-XDA, p-XDA)	OSHA 105	2 Glass fibre filters; sulphuric acid	10	225-9004

Notes

§ Storage below 4°C required

† Custom order due to very limited shelf-life

‡ While meeting the specifications of OSHA Methods 42 and 47, Coated Filter Part Number. 225-9002 contains a higher than specified loading of reagent to increase stability and shelf-life. Coated Filter Part Number 225-9002 traps both vapour and aerosol phases. SKC also offers Coated Filter Part Number 225-9013 that contains the specified reagent loading for OSHA 42 and 47, but has a freezer shelf-life of only three months.

∑ Meets multiple ASTM methods, see ISO-CHEK Cassettes

¥ NIOSH Method 2017 also requires SKC Sorbent Tube Part No. 226-15.

# Collects both vapour and aerosol phases of fluorides. The concept of sampling for fluorides in air using a double filter is patented in Canada by IRSST (Institut de recherche en santé et Robert-Suavé en sécurité du travail du Québec), Patent No. 1,299,114.

Ω OSHA 57 is an update of NIOSH 5029 which called for a single filter

¶ Requires Impinger, Part No. 225-36-1

• Also requires Sorbent Tube Part Number 226-193-UC or 226-199-UC for simultaneous, separate sampling of peracetic acid

Δ ASTM D5836 and D5932 for 2,4-TDI, 2,6-TDI only

♠ A coated filter is not needed for this method, as sulphuric acid and phosphoric acid are non-volatile acids and are present in the air as an aerosol.

♦ Requires impinger and sorbent trap for simultaneous sampling of PAA and Hydrogen Peroxide

Documentation