User manual

Chapter 8: Internal Devices
Resistance of the Touchscreen
8580/8590 Vehicle-Mount Computer User Manual 119
Pencil Hardness Test ASTM D 3363.74
The resistive 8580/8590 touchscreens have a hardness > 4H.
Test scale (from softest to hardest): 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H,
7H, 8H, 9H
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
Mineral oil none none
40% sodium hydroxide none slight corrosion
111 trichlorethane none none
Turpentine none none
Vm & P Naphtha none none