Using a Math Model Table to Determine a Cartridge's Service Life » Comparing Predicted Calculation with Experimental Data

The following table provides a comparison of breakthrough times calculated using the Wood model versus experimental data. The percent variation of the calculated from the experimental values is also presented.

• Wood, G.O., Estimating Service Lives of Organic Vapor Cartridges, American Industrial Hygiene Association Journal, 55:11-15 (1994).
• Nelson, G.O., A.N. Correia, Respirator cartridge efficiency studies: VIII. Summary and conclusions, American Industrial Hygiene Association Journal, 37:514-525 (1976).

OSHA used the following standard conditions:

• Contaminant concentration: 1000 ppm
• Number of respirator cartridges: 2
• Sorbent: Activated charcoal, the specific source varied with manufacturer
• Sorbent mass per cartridge:
• Experimental - 25-40 g, the amount varied with manufacturer
• Calculated - 26 g
• Flow rate: 53.3 liters per minute
• Temperature: 22 degrees Celsius
• Relative humidity: 50%
• Preconditioning humidity: 50% (for experimental)

These tables are best viewed on tablets, notebooks, or desktop computer screens.

Compound Name

1% Breakthrough

10% Breakthrough

Model Experimental Model vs Exp. Model Experimental Model vs Exp.
Aromatics
Benzene

56

73

-22.3%

68

88

-23.1%

Toluene

61

94

-34.5%

72

114

-36.4%

Ethylbenzene

60

83

-27.4%

70

105

-33.1%

m-Xylene

60

98

-38.3%

70

116

-39.3%

Cumene

56

81

-30.5%

64

103

-37.2%

Mesitylene

57

85

-33.3%

65

105

-37.6%

p-Cymene

52

75

-30.8%

59

92

-36.0%

Alcohols
Methanol

2

0

990.0%

5

3

54.3%

Ethanol

30

28

7.1%

43

45

-4.8%

Isopropanol

47

54

-12.1%

61

81

-24.8%

Allyl alcohol

69

65

5.9%

87

105

-16.5%

Propanol

56

85

-34.2%

73

123

-40.5%

sec-Butanol

58

96

-38.7%

72

121

-39.8%

Butanol

68

115

-40.3%

84

141

-40.3%

2-Pentanol

63

86

-27.4%

75

111

-32.2%

3-Methyl-1-butanol

66

97

-31.9%

78

121

-34.8%

4-Methyl-2-pentanol

57

75

-23.2%

67

96

-29.4%

Pentanol

66

103

-35.1%

79

130

-38.6%

2-Ethyl-1-butanol

61

76

-19.2%

72

101

-28.3%

Monochlorides
Methyl chloride

2

0

3821.5%

2

0

320.8%

Vinyl chloride

7

3

94.6%

9

6

44.5%

Ethyl chloride

18

5

220.2%

22

10

114.0%

2-Chloropropane

27

26

5.7%

34

35

-4.7%

Allyl chloride

32

30

5.9%

40

44

-9.6%

1-Chloropropane

43

24

78.3%

52

38

36.9%

2-Chloro-2-methylpropane

46

37

23.7%

54

52

3.6%

1-Chlorobutane

51

72

-28.1%

61

88

-30.4%

2-Chloro-2-methylbutane

46

58

-20.2%

55

79

-30.3%

1-Chloropentane

52

74

-29.1%

62

96

-35.6%

Chlorocyclopentane

77

106

Chlorobenzene

72

107

-32.6%

83

131

-36.3%

1-Chlorohexane

53

77

-30.6%

62

95

-35.1%

o-Chlorotoluene

65

102

-35.3%

76

122

-37.5%

1-Chloroheptane

49

81

-39.7%

56

101

-44.1%

3-(Chloromethyl) heptane

42

63

-33.1%

48

80

-40.1%

Dichlorides
Dichloromethane

21

10

111.8%

28

15

77.8%

trans-1,2-Dichloroethylene

35

33

7.5%

44

50

-12.1%

1,1-Dichloroethane

29

23

24.4%

35

40

-10.4%

cis-1,2-Dichloroethylene

40

29

36.5%

50

42

19.2%

1,2-Dichloroethane

48

54

-10.7%

60

79

-24.3%

1,2-Dichloropropane

55

65

-14.0%

67

90

-25.6%

cis-1,2-Dichloropropene

85

110

trans-1,2-Dichloropropene

108

129

1,4-Dichlorobutane

54

109

-49.9%

64

132

-51.3%

o-Dichlorobenzene

70

81

Trichlorides
Chloroform

42

33

27.7%

52

52

0.0%

Methyl chloroform

48

40

19.3%

57

58

-1.8%

Trichloroethylene

56

55

2.7%

68

83

-17.7%

1,1,2-Trichloroethane

65

71

-9.4%

77

112

-30.4%

1,2,3-Trichloropropane

69

111

-37.5%

81

132

-38.2%

Tetrachlorides
Carbon tetrachloride

51

77

-33.1%

61

90

-31.5%

Perchloroethylene

65

107

-38.5%

77

129

-40.0%

1,1,2,2-Tetrachloroethane

69

104

-33.2%

81

131

-37.7%

Pentachlorides
Pentachloroethane

63

93

-31.5%

73

117

-36.8%

Acetates
Methyl acetate

27

32

-14.9%

36

46

-22.3%

Vinyl acetate

39

55

-27.8%

49

81

-39.0%

Ethyl acetate

43

66

-35.1%

53

84

-37.1%

Isopropyl acetate

47

64

-26.8%

56

85

-34.2%

Isopropenyl acetate

80

106

Propyl acetate

51

78

-34.6%

61

99

-37.9%

Allyl acetate

75

95

sec-Butyl acetate

82

101

Butyl acetate

53

77

-31.1%

62

96

-35.7%

Isopentyl acetate

51

70

-26.9%

59

88

-32.3%

1,3-Dimethylbutyl acetate

60

76

Pentyl acetate

52

72

-28.2%

60

87

-31.2%

Hexyl acetate

48

67

-28.2%

55

85

-35.4%

Ketones
Acetone

23

37

-37.7%

30

46

-33.4%

2-Butanone

42

81

-48.2%

52

94

-43.9%

2-Pentanone

52

104

-49.8%

62

121

-48.0%

3-Pentanone

53

93

-43.3%

63

114

-44.0%

4-Methyl-2-pentanone

53

96

-44.8%

62

111

-43.7%

Mesityl oxide

61

122

-49.8%

72

139

-48.2%

Cyclopentanone

68

141

-51.5%

83

161

-48.3%

2,4-Pentanedione

65

130

-49.7%

78

144

-45.7%

3-Heptanone

54

91

-40.1%

63

105

-39.7%

2-Heptanone

47

101

-53.4%

54

114

-52.1%

Cyclohexanone

68

126

-45.3%

81

144

-43.1%

5-Methyl-3-heptanone

86

99

3-Methylcyclohexanone

100

123

Diisobutyl ketone

46

70

-34.8%

52

83

-37.0%

4-Methylcyclohexanone

111

126

Alkanes
Pentane

30

60

-49.4%

37

71

-48.1%

2,3-Dimethylbutane

38

72

-46.3%

45

81

-43.8%

Hexane

40

52

-21.9%

48

64

-25.6%

Methylcyclopentane

45

62

-27.3%

53

76

-29.5%

Cyclohexane

49

68

-28.3%

58

82

-29.0%

2,2,4-Trimethylpentane

42

68

48

80

Heptane

45

78

-33.3%

52

89

-34.3%

Methylcyclohexane

51

68

-34.7%

59

80

-33.8%

1,3,5-Cycloheptatriene

121

136

2,2,5-Trimethylhexane

42

67

-64.8%

48

80

-64.4%

5-Ethylidene-2-orbornene

86

101

Cyclooctane

46

96

-46.8%

53

113

-47.4%

Nonane

44

76

-53.7%

51

89

-54.7%

Decane

42

70

-44.3%

48

81

-46.2%

Amines
Methylamine

1

12

-89.5%

2

17

-88.8%

Dimethylamine

10

17

-40.3%

13

21

-37.7%

Ethylamine

18

40

-53.3%

24

49

-51.4%

Isopropylamine

23

65

-63.5%

30

75

-60.2%

Propylamine

29

90

-66.7%

37

111

-66.0%

Diethylamine

41

88

-52.8%

49

105

-52.5%

Butylamine

47

110

-56.9%

57

125

-54.0%

Triethylamine

45

81

-43.4%

53

91

-41.2%

Dipropylamine

50

93

-45.8%

58

105

-44.1%

Diisopropylamine

44

77

-42.4%

51

87

-40.8%

Cyclohexylamine

59

112

-47.2%

69

128

-45.9%

Dibutylamine

47

75

-36.8%

54

84

-35.7%

Miscellaneous
Methyl iodide

39

11

241.3%

49

17

179.6%

Acrylonitrile

72

48

50.1%

90

61

48.7%

Dibromomethane

73

82

-10.4%

89

121

-26.1%

Pyridine

71

119

-39.5%

87

>134

-34.9%

Epichlorohydrin

67

85

-20.9%

84

110

-23.4%

2-Methoxyethanol

116

145

1,2-Dibromoethane

76

>141

-45.8%

91

165

-44.8%

1-Nitropropane

65

143

-54.3%

80

164

-50.8%

2-Ethoxyethanol

67

77

-12.5%

81

123

-33.4%

Acetic anhydride

67

124

-45.2%

83

138

-39.6%

2-Methoxyethyl acetate

60

93

-35.0%

71

113

-36.5%

Bromobenzene

73

142

-48.1%

84

159

-46.6%

2-Ethoxyethyl acetate

56

79

-28.8%

66

96

-31.6%