|
The Wood Math Model Table |
The table below provides breakthrough times for 120 chemicals at various concentrations.
OSHA derived these breakthrough times from the
Gerry O. Wood math model (Wood, G.O., Estimating Service Lives of Organic Vapor Cartridges,
American Industrial Hygiene Association Journal, 55:11-15, 1994).
Keep In Mind
- OSHA used the following standard conditions:
Number of respirator cartridges: 2
|
Temperature: 72 degrees Fahrenheit (22 degrees Celsius) |
Sorbent: Activated charcoal |
Relative humidity: less than or equal to 50% |
Sorbent mass per cartridge: 26 g |
Breakthrough: 10% |
Flow rate: 53.3 liters per minute |
|
- If the conditions in your case are significantly different from these, in particular relative humidities greater
than 65%, you will need to make the appropriate corrections to the time given by the table.
Another section of this advisor provides a discussion
of these factors.
How to use this Table
Look down the left column to find the chemical and across the row to the column with the
identified concentration, and there you will find the service life time in minutes.
Breakthrough Times (min)
|
Indicates that the service life for this contaminant is limited to a single
workshift by the OSHA Standard. |
Name |
CAS # |
Contaminant Concentration (ppm) |
|
|
50 |
100 |
200 |
500 |
1000 |
Aromatics |
|
|
|
|
|
|
Benzene |
71-43-2 |
|
Limited to a maximum concentration of 50 ppm for negative
pressure APR |
See the Benzene Standard
1910.1028(g) |
Toluene |
108-88-3 |
1018 |
562 |
307 |
135 |
72 |
Ethylbenzene |
100-41-4 |
1133 |
604 |
319 |
135 |
70 |
m-Xylene |
108-38-3 |
1143 |
608 |
321 |
136 |
70 |
Cumene |
98-82-8 |
1122 |
586 |
304 |
126 |
64 |
Mesitylene |
108-67-8 |
1159 |
603 |
311 |
128 |
65 |
p-Cymene |
99-87-6 |
1104 |
566 |
289 |
117 |
59 |
|
|
|
|
|
|
|
Alcohols |
|
|
|
|
|
|
Methanol |
67-56-1 |
This calculation is not applicable to this compound |
Ethanol |
64-17-5 |
123 |
105 |
85 |
60 |
43 |
Isopropanol |
67-63-0 |
425 |
286 |
186 |
101 |
61 |
Allyl alcohol |
107-18-6 |
789 |
495 |
303 |
152 |
87 |
Propanol |
71-23-8 |
551 |
364 |
233 |
123 |
73 |
sec-Butanol |
78-92-2 |
773 |
464 |
272 |
130 |
72 |
Butanol |
71-36-3 |
1073 |
615 |
345 |
156 |
84 |
2-Pentanol |
6032-29-7 |
1091 |
601 |
327 |
143 |
75 |
3-Methyl-1-butanol |
123-41-3 |
1242 |
672 |
358 |
152 |
78 |
4-Methyl-2-pentanol |
108-11-2 |
1076 |
578 |
307 |
130 |
67 |
Pentanol |
71-41-0 |
1281 |
690 |
366 |
155 |
79 |
2-Ethyl-1-butanol |
97-95-0 |
1246 |
657 |
342 |
142 |
72 |
|
|
|
|
|
|
|
Monochlorides |
|
|
|
|
|
|
Methyl chloride |
74-87-3 |
Not applicable, boiling point below ambient temperatures |
Vinyl chloride |
75-01-4 |
Not applicable, boiling point below ambient temperatures |
See the Vinyl Chloride Standard
1910.1017(g) |
Ethyl chloride |
75-00-3 |
Not applicable, boiling point below ambient temperatures |
2-Chloropropane |
75-29-6 |
224 |
150 |
99 |
54 |
34 |
Allyl chloride |
107-05-1 |
264 |
177 |
116 |
64 |
40 |
1-Chloropropane |
540-54-5 |
492 |
301 |
181 |
90 |
52 |
2-Chloro-2-methylpropane |
507-20-0 |
655 |
374 |
212 |
98 |
54 |
1-Chlorobutane |
109-69-3 |
733 |
422 |
239 |
111 |
61 |
2-Chloro-2-methylbutane |
594-36-5 |
705 |
398 |
222 |
101 |
55 |
1-Chloropentane |
543-59-9 |
852 |
474 |
260 |
116 |
62 |
Chlorocyclopentane |
930-28-9 |
|
|
|
|
|
Chlorobenzene |
108-90-7 |
1327 |
709 |
376 |
160 |
83 |
1-Chlorohexane |
544-10-5 |
993 |
530 |
281 |
119 |
62 |
o-Chlorotoluene |
95-49-8 |
1297 |
682 |
356 |
148 |
76 |
1-Chloroheptane |
629-06-1 |
930 |
492 |
258 |
109 |
56 |
3-(Chloromethyl) heptane |
123-04-6 |
771 |
410 |
216 |
92 |
48 |
|
|
|
|
|
|
|
Dichlorides |
|
|
|
|
|
|
Dichloromethane |
75-09-2 |
See the Methylene Chloride Standard
1910.1052(g) |
trans-1,2-Dichloroethylene |
156-60-5 |
296 |
198 |
129 |
71 |
44 |
1,1-Dichloroethane |
75-35-4 |
234 |
157 |
103 |
57 |
35 |
cis-1,2-Dichloroethylene |
156-59-2 |
356 |
236 |
152 |
82 |
50 |
1,2-Dichloroethane |
107-06-2 |
482 |
310 |
194 |
101 |
60 |
1,2-Dichloropropane |
78-87-5 |
776 |
452 |
259 |
121 |
67 |
cis-1,2-Dichloropropene |
6923-20-2 |
|
|
|
|
|
trans-1,2-Dichloropropene |
7069-38-7 |
|
|
|
|
|
1,4-Dichlorobutane |
110-56-5 |
846 |
475 |
263 |
118 |
64 |
o-Dichlorobenzene |
95-50-1 |
|
|
|
|
|
|
|
|
|
|
|
|
Trichlorides |
|
|
|
|
|
|
Chloroform |
67-66-3 |
409 |
263 |
166 |
87 |
52 |
Methyl chloroform |
71-55-6 |
618 |
366 |
214 |
102 |
57 |
Trichloroethylene |
79-01-6 |
749 |
441 |
256 |
122 |
68 |
1,1,2-Trichloroethane |
79-00-5 |
976 |
558 |
314 |
143 |
77 |
1,2,3-Trichloropropane |
96-18-4 |
|
|
|
|
|
|
|
|
|
|
|
|
Tetrachlorides |
|
|
|
|
|
|
Carbon tetrachloride |
56-23-5 |
677 |
398 |
231 |
109 |
61 |
Perchloroethylene |
127-18-4 |
1106 |
609 |
331 |
145 |
77 |
1,1,2,2-Tetrachloroethane |
79-34-5 |
|
|
|
|
|
|
|
|
|
|
|
|
Pentachlorides |
|
|
|
|
|
|
Pentachloroethane |
76-01-7 |
|
|
|
|
|
|
|
|
|
|
|
|
Acetates |
|
|
|
|
|
|
Methyl acetate |
79-20-9 |
182 |
131 |
92 |
55 |
36 |
Vinyl acetate |
108-05-4 |
389 |
251 |
158 |
82 |
49 |
Ethyl acetate |
141-78-6 |
483 |
299 |
182 |
91 |
53 |
Isopropyl acetate |
108-21-4 |
668 |
386 |
219 |
102 |
56 |
Isopropenyl acetate |
108-22-5 |
|
|
|
|
|
Propyl acetate |
109-60-4 |
768 |
438 |
246 |
112 |
61 |
Allyl acetate |
591-87-7 |
|
|
|
|
|
sec-Butyl acetate |
105-46-4 |
|
|
|
|
|
Butyl acetate |
123-86-4 |
935 |
508 |
273 |
118 |
62 |
Isopentyl acetate |
123-92-2 |
1007 |
530 |
277 |
116 |
59 |
1,3-Dimethylbutyl acetate |
540-88-5 |
|
|
|
|
|
Pentyl acetate |
628-63-7 |
1023 |
537 |
280 |
117 |
59 |
Hexyl acetate |
142-92-7 |
|
|
|
|
|
|
|
|
|
|
|
|
Ketones |
|
|
|
|
|
|
Acetone |
67-64-1 |
118 |
92 |
69 |
44 |
30 |
2-Butanone |
78-93-3 |
423 |
271 |
170 |
88 |
52 |
2-Pentanone |
107-87-9 |
729 |
424 |
243 |
113 |
62 |
3-Pentanone |
96-22-0 |
744 |
433 |
248 |
115 |
63 |
4-Methyl-2-pentanone |
108-10-1 |
884 |
488 |
266 |
117 |
62 |
Mesityl oxide |
141-79-7 |
1063 |
581 |
314 |
136 |
71 |
Cyclopentanone |
120-92-3 |
1020 |
589 |
333 |
153 |
83 |
2,4-Pentanedione |
123-54-6 |
1103 |
612 |
335 |
147 |
78 |
3-Heptanone |
106-35-4 |
1061 |
561 |
294 |
123 |
63 |
2-Heptanone |
110-43-0 |
791 |
432 |
234 |
102 |
54 |
Cyclohexanone |
108-94-1 |
1257 |
683 |
366 |
157 |
81 |
5-Methyl-3-heptanone |
|
|
|
|
|
|
3-Methylcyclohexanone |
625-96-7 |
|
|
|
|
|
Diisobutyl ketone |
108-83-8 |
963 |
496 |
254 |
103 |
52 |
4-Methylcyclohexanone |
589-92-4 |
|
|
|
|
|
|
|
|
|
|
|
|
Alkanes |
|
|
|
|
|
|
Pentane |
109-66-0 |
332 |
205 |
124 |
63 |
37 |
2,3-Dimethylbutane |
79-29-8 |
533 |
307 |
175 |
82 |
45 |
Hexane |
110-54-3 |
585 |
334 |
189 |
87 |
48 |
Methylcyclopentane |
96-37-7 |
613 |
357 |
205 |
96 |
53 |
Cyclohexane |
110-82-7 |
|
|
|
|
|
2,2,4-Trimethylpentane |
540-84-1 |
747 |
401 |
214 |
92 |
48 |
Heptane |
142-82-5 |
769 |
420 |
227 |
99 |
52 |
Methylcyclohexane |
108-87-2 |
842 |
463 |
252 |
111 |
59 |
1,3,5-Cycloheptatriene |
544-25-2 |
|
|
|
|
|
2,2,5-Trimethylhexane |
3522-94-9 |
817 |
429 |
224 |
93 |
48 |
5-Ethylidene-2-orbornene |
|
|
|
|
|
|
Cyclooctane |
292-64-8 |
747 |
410 |
224 |
99 |
53 |
Nonane |
111-84-2 |
907 |
470 |
242 |
100 |
51 |
Decane |
124-18-5 |
902 |
461 |
234 |
95 |
48 |
|
|
|
|
|
|
|
Amines |
|
|
|
|
|
|
Methylamine |
74-89-5 |
Not applicable, boiling point below ambient temperatures |
Dimethylamine |
124-40-3 |
Not applicable, boiling point below ambient temperatures |
Ethylamine |
75-04-7 |
Not applicable, boiling point below ambient temperatures |
Isopropylamine |
75-31-0 |
167 |
117 |
80 |
46 |
30 |
Propylamine |
107-10-8 |
226 |
155 |
104 |
59 |
37 |
Diethylamine |
109-89-7 |
498 |
299 |
177 |
86 |
49 |
Butylamine |
109-73-9 |
580 |
349 |
207 |
100 |
57 |
Triethylamine |
121-44-8 |
747 |
412 |
225 |
100 |
53 |
Dipropylamine |
142-84-7 |
871 |
474 |
255 |
111 |
58 |
Diisopropylamine |
108-18-9 |
716 |
395 |
216 |
96 |
51 |
Cyclohexylamine |
108-91-8 |
1065 |
575 |
308 |
132 |
69 |
Dibutylamine |
111-92-2 |
980 |
507 |
261 |
107 |
54 |
|
|
|
|
|
|
|
Miscellaneous |
|
|
|
|
|
|
Methyl iodide |
74-88-4 |
This calculation is not applicable to this compound |
Acrylonitrile |
107-13-1 |
|
465 |
Limited to a maximum concentration of 100 ppm |
See the Acrylonitrile Standard
1910.1045(h) |
Dibromomethane |
74-95-3 |
947 |
565 |
331 |
158 |
89 |
Pyridine |
110-86-1 |
1031 |
599 |
342 |
158 |
87 |
Epichlorohydrin |
106-89-8 |
866 |
525 |
310 |
150 |
84 |
2-Methoxyethanol |
109-86-4 |
|
|
|
|
|
1,2-Dibromoethane |
106-93-4 |
1252 |
699 |
384 |
170 |
90 |
1-Nitropropane |
108-03-2 |
933 |
548 |
315 |
147 |
80 |
2-Ethoxyethanol |
110-80-5 |
1105 |
624 |
345 |
154 |
81 |
Acetic anhydride |
108-24-7 |
1095 |
623 |
348 |
156 |
83 |
2-Methoxyethyl acetate |
32718-56-2 |
1092 |
594 |
319 |
137 |
71 |
Bromobenzene |
108-86-1 |
1448 |
761 |
397 |
165 |
84 |
2-Ethoxyethyl acetate |
111-15-9 |
1143 |
600 |
312 |
129 |
65 |
|
|