Table 7. Percentage weight gain of ABS exposed to chemical treatment.
Contact time (days)
Chemical
1
7
14
21
28
56
112
46.6s
Acetic acid (glacial)
19.9
55.9
61.1
64.0
70.7
76.8
Acetone
D
Benzaldehyde
D
Benzene
D
Benzyl alcohol
D
Bromochloromethane
D
N-butylamine
D
80.6s
Carbon tetrachloride
260.1
269.9
290.5
291.2
303.3
317.2
Chlorobenzene
D
Chloroform
D
Cyclohexanone
D
1,2-dichlorobenzene
D
1,2-dichloroethane
D
trans-1,2-dichloroethylene
D
83.0s
Diethylamine
110.8
112.9
105.5
108.6
110.6
112.8
Dimethylformamide
D
50.0s
Gasoline (93 octane, unleaded)
20.6
56.6
58.4
58.7
60.9
61.9
Hexane (85% N-hexane)
1.5
5.8
8.7
9.9
11.2
13.4
15.1
Hydrochloric acid (25% w/v)
0.1
0.5
0.5
0.6
0.6
0.9
1.2
Kerosene (K-1)
0.5
1.4
2.0
2.7
3.3
5.6
8.9
Methyl alcohol
4.2
10.0
13.0
15.0
16.5
21.8
27.8
Methyl ethyl ketone
D
Methylene chloride
D
Nitrobenzene
D
Sodium hydroxide (25% w/v)
0.4
0.8
0.8
0.7
0.8
0.7
0.9
102.9s
Tetrachloroethylene
211.2
232.7
237.2
236.9
245.7
251.2
Tetrahydrofuran
D
Toluene
D
Trichloroethylene
D
206.2s
o-xylene
D
D dissolved or disintegrated upon handling
s first observation of swelling and/or softening
only five or six chemicals (respectively) where the
CONCLUSIONS AND
ratings did not agree (given in bold print in Table
RECOMMENDATIONS
8). (There were no listings for FEP or FRP.) The
Based on our findings, we would rank the re-
largest disparity is between their ratings for "ep-
sistance of these materials to organic solvents,
oxy" and our findings for FRE. For FRE, we would
from greatest to least resistance, as: FEP=PTFE>
change the ratings for 17 of the 30 chemicals tested,
FRE> FRP> PVC> ABS. This ranking should be
although there is no trend in either direction. The
used only as a general guide, not as a rule. FRE,
differences between "epoxy" and FRE most likely
FRP, ABS, and PVC casing materials should be
account for these differences. Differences in con-
tested with any chemical they are going to be ex-
tact time may also explain some of these differ-
posed to, if they haven't been already. It appears
ences. For PVC we would change the ratings for
that all the materials have excellent resistance to
seven chemicals, raising it for six of them.
alkaline conditions except FRP, which was only
Generally, our results agreed with those of the
slightly affected. With respect to exposure to
Nalge Company for PTFE, FEP, and rigid PVC.
acidic conditions, FEP, PTFE, and PVC all have
There were exceptions for two chemicals (TCE
excellent resistance, ABS was slightly affected,
and chloroform) for PTFE and one exception for
and FRE and FRP were affected the most, al-
FEP (TCE). For rigid PVC there were six chemi-
though weight losses were only 5% by the end of
cals where our results did not agree; we would
the study.
raise the rating for four of those chemicals.
8
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