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Chapter 8: Internal Devices
Resistance Of The Touchscreen
118 8580/8590 Vehicle-Mount Computer User Manual
8.5.3 Resistance Of The Touchscreen
Resistance to chemical substances
The transparent coating of the 8580/8590 touchscreen surface is resistant to most
chemical substances that are normally used at home or in the industrial sector.
As the majority of chemicals react more intensely at higher temperatures, the screen
has been designed for normal room temperatures as well as extreme operating
temperatures.
Important: The data listed here applies exclusively to Psion Teklogix's resis-
tive touchscreens.
Household Chemicals
Reaction time:24 hours
Visible Effect at 29°C, 90%
Relative Humidity (RH)
Visible Effect at 50°C, dry
Coffee none none
Ketchup none none
Cleaning agents (liquid) none none
Milk none none
Mustard none slight yellow stain
Strong Tea none none
Vinegar none none
Solvents/Industrial
Chemicals
Visible Effect at 29°C,
90% Relative Humidity
(RH)
Visible Effect at 50°C,
dry
Acetic acid none none
Acetone/MEK, 50/50 none none
Brake fluid none none
Butyl acetate none none
Cellosolve none none
Ethanol/isopropanol, 50/50 none none
Gasoline none none
Concentrated sulfuric acid none none
Petrol-based oil none none