Omron V680 Series User Manual page 330

Section 11
Appendices
 Applicable Models
V680-D1KP66T-SP
PFA resin is used for exterior case material. Refer to the following lists and do not use chemicals that
affect PFA resin.
RF Tags cannot be used in applications with explosion-proof specifications.
 Chemical Resistance of Fluoroplastic PFA (Reference)
PFA: Tetrafluorethylene-Perfluoroalkylvinyletheir Copolymer
Fluoroplastic PFA does not react with most chemicals except molten alkali metal, hot pressurized
fluorine (F2), and some halogen derivatives. The following tables show the results of tests in which
PFA was soaked in or exposed to commonly used organic and inorganic chemicals. In these tests, a
compression-molded test piece (1.3 mm thick) was soaked in the chemical at a specified temperature
for a week (168 houre) and taken out of the chemical, then the weight change, tensile strength, and
elongation of the test piece were immediately measured. If the change in the tensile strength is 15 % or
less, the cange in the elongation is 10 % or less, and the increase in the weight is less than 0.5 %, the
results of the test can be considered normal.
If PFA is exposed to trichloroacetic acid, tri-n-butyl phosphate, perchloroethylene, carbon thtrachloride,
and other liquids (which easily make resin surfaces wet) at a high temperature, it tends to increase its
weight due to absorption and reduce its tensile strength. Even when PFA absorbs chemicals and
solvents, its molecular structure will not change, If, however, PFA is subject to temperature or pressure
changes or mechanical damage when it has absorbed chemicals, the chemicals will repeatedly
expand and contract inside pfa, causing mechanical problems such as cracks and bulging. In fact, this
problem occurs with any kind of plastic.

Inorganic Chemicals
Chemical name
concentrated hydrochloric acid
Concentrated sulfuric acid
Hydrofluoric acid (60%)
Fuming sulfuric acid
Aqua regia
Chromic acid (50%)
Consentrated nitric acid
Fuming nitric acid
Concentrated ammonia solution
Caustic soda (50%)
Hydrogen peroxide solution (30%) 23
Bromine
Chlorine
Ferrous chloride (25%)
Zinc chloride (25%)
Chlorosulfonic acid
Concentrated phosphoric acid
RFID System
328
User's Manual
(Modbus TCP)
Resulting characteristics
Test
temperature
(°C)
Tensile strength
120 98
120 95
23 99
23 95
120 99
120 93
120 95
23 99
66 98
120 93
93
23 99
120 92
100 93
100 96
151 91
100 93
Weight
(%)
increase
rate (%)
Elongation
100 0.0
98 0.0
99 0.0
96 0.0
100 0.0
97 0.0
98 0.0
99 0.0
100 0.0
99 0.4
95 0.0
100 0.5
100 0.5
98 0.0
100 2.7
100 2.7
100 0.0