Agriculture Reference
In-Depth Information
Indeed, this effect has been measured.
Table 6.3
shows that for nitrile glove
materials of approximately the same thickness from eight manufacturers, the
breakthrough times exhibited differences of a factor of ten for perchloroethyl-
ene, a factor of six for p-xylene, and a factor of four for butyl acetate. For neo-
prene glove materials from five manufacturers, the breakthrough times differed
by factors of eight for ethanol, five for n-hexane, and two for butyl acetate.
Note: There is a greater thickness variation among the neoprene gloves than
with the nitrile gloves. As will be discussed later, each of the above chemicals
has been identified as one that may appear in a pesticide formulation. In par-
ticular, xylenes are widely used as an ingredient in emulsifiable concentrates of
Toxicity Category I and II pesticides.
Table 6.3
Breakthrough times (minutes) for perchloroethylene, p-Xylene,
n-Butyl acetate, Ethanol, and n-Hexane through nitrile and neoprene gloves
from several manufecturers (U.S. EPA,
Guidance Manual for Selecting Pro-
tective Clothing for Agricultural Pesticide Operations)
.
Thickness
Perchloro-
n-Butyl
Manufacturer
{mm)
ethylene
p-Xylene
acetate
Ethanol
n-Hexane
Nitrile
Ansell
0.36
30
11
15
Best
0.28
135
27
28
Edmont
0.32
215
33
44
Granet
0.32
90
24
32
Intermarket
0.36
125
28
39
LRC
0.28
295
54
38
North
0.32
145
33
38
Pioneer
0.32
295
60
56
Neoprene
Ansell
0.38
14
500
106
Best
0.64
13
110
21
Edmont
0.46
20
480
82
Granet
0.55
13
80
23
Pioneer
0.55
33
690
72
4.
Chemical Composition
Published permeation data are predominantly from tests in which the chal-
lenge chemical is neat (pure). Considerably less testing has been performed
with multicomponent chemical solutions. That which has been reported rep-
resents a broad spectrum of results. In some cases, the permeation of any one
component occurs at a slower rate than when the chemical was tested in neat
form. In other cases, the permeation is at a greater rate, and in others there
