User Manual

83
RFID System
User's Manual
Section 5 Chemical Resistance of Tags
Section 5
Chemical Resistance
Applicable Models
 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 (F
2), 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 sol-
vents, 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
V680-D1KP66T-SP
Chemical name
Test
temperature
(°C)
Resulting characteristics
(%)
Weight
increase
rate (%)
Tensile
strength
Elongation
concentrated hydrochloric acid 120 98 100 0.0
Concentrated sulfuric acid 120 95 98 0.0
Hydrofluoric acid (60%) 23 99 99 0.0
Fuming sulfuric acid 23 95 96 0.0
Aqua regia 120 99 100 0.0
Chromic acid (50%) 120 93 97 0.0
Consentrated nitric acid 120 95 98 0.0
Fuming nitric acid 23 99 99 0.0
Concentrated ammonia solution 66 98 100 0.0
Caustic soda (50%) 120 93 99 0.4
Hydrogen peroxide solution (30%) 23 93 95 0.0
Bromine 23 99 100 0.5
Chlorine 120 92 100 0.5
Ferrous chloride (25%) 100 93 98 0.0
Zinc chloride (25%) 100 96 100 2.7
Chlorosulfonic acid 151 91 100 2.7
Concentrated phosphoric acid 100 93 100 0.0