Table 10a. Hardness (Barcol) readings of PVC exposed to ace-
tone solutions.
Contact time, months
Concentration (%)
3
6
9
12
15
18
control
73
74
80
77
79
81
control
71
74
79
76
77
78
control
72
73
77
77
78
78
control
71
72
78
78
78
79
control
72
74
77
79
78
80
71.8
73.4
78.2
77.4
78.0
79.2
X
0.5
71
74
78
77
77
78
0.5
72
75
80
78
78
76
0.5
72
73
77
76
78
79
0.5
71
73
79
77
77
79
0.5
71
72
76
77
79
80
71.4
73.4
78.0
77.0
77.8
78.4
X
1.0
71
73
78
77
78
78
1.0
71
74
77
76
79
79
1.0
70
74
78
78
77
79
1.0
71
72
78
76
77
78
1.0
72
73
78
77
78
78
71.0
73.2
77.8
76.8
77.8
78.4
X
5.0
71
73
79
76
76
77
5.0
72
72
78
76
76
78
5.0
70
72
79
78
76
77
5.0
71
73
78
77
77
76
5.0
71
74
74
76
75
76
71.0
72.8
77.6
76.6
76.0*
76.8*
X
10.0
71
71
76
76
75
75
10.0
71
73
75
74
74
75
10.0
72
72
74
74
75
77
10.0
70
71
76
73
74
76
10.0
71
73
75
75
73
76
71.0
72.0*
75.2*
74.4*
74.2*
75.8*
X
20.0
69
71
69
74
72
72
20.0
71
73
73
72
69
71
20.0
70
72
73
73
72
71
20.0
69
71
71
70
69
70
20.0
71
72
72
71
68
70
70.0*
71.8*
71.6*
72.0*
70.0*
70.8*
X
*Significantly different from controls.
Studies on aqueous solutions
The results from the first long-term study com-
containing organics that are
pare well with these findings. In the previous
miscible in water
experiment the Teflon-lined caps were lined with
aluminum foil to prevent substantial losses of the
Long-term acetone study
organic solutes due to sorption by the Teflon lin-
Table 10 shows the results of long-term (18
ers. In this experiment there was no aluminum
months) exposure to 0.5%, 1.0%, 5.0%, 10%, and
liner. Thus, we concluded that the Teflon does
20% solutions of acetone. By the end of the study,
not appear to substantially alter the ability of the
the 5.0%, 10%, and 20% solutions were able to
test solutions to affect PVC.
16
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