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.
Click on the part number to view the specific instruction sheet.
| Chemical | Method | Filter; Coating | Pack Size | Part Number |
| 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 | 1 Glass fibre filter and cellulose support; 1-(2-pyridyl) piperazine | 10 | 225-9013 § † |
| OSHA 5002 | 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 and cellulose support; 1 coated with sodium carbonate, 1 uncoated | 10 | 225-9032 |
| Hydrogen chloride | NIOSH 7907 | 2 Quartz filters and cellulose support; 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) • |
| 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 ∑ |
| 36 | 225-9022A ∑ | |||
| Isocyanates (HDI;2,6-TDI;2,4-TDI) | ASTM D5836 Δ | 1 Glass fibre filter and cellulose support; 1-(2-pyridyl) piperazine | 10 | 225-9013 § † |
| OSHA 5002 | 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 § † |
| 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 and cellulose support; 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 |
| Trimellitic anhydride | OSHA 98 | 2 Glass fibre filters; veratrylamine and di-n-octyl phthalate | 10 | 225-9010 † |
| 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 5002 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 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
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Coated Filters in Cassettes |