Technical data of membrane keyboards:
| Membrane keyboards | |
| Guaranteed life expectancy (U<30V, I<25mA) | 5 x 106 cycles |
| Conductive path resistance | <1 Ω/cm |
| Conductive path width | min. 0,2 mm |
| Contact key resistance (depending on keyboard design and customer’s requirements) | 20Ω – 1000Ω |
| Insulation resistance | >10MΩ |
| Operation voltage | max 30V |
| Operation current | max 25mA |
| Ambient humidity | max 95% |
| Operation temperature | -40°C- +70°C |
| Storage temperature | -40°C- +80°C |
| External dimensions | max 350 x 700mm |
| Conductive strip bending radius (min) | 2,0 mm |
| LED voltage | 2 – 30 V |
| EL lamp voltage/frequency | 130V 400Hz |
| Switch force | 1,5 – 8,0 N |
Print parameters
| Screen Printing | Digital printing | |
| Recommended line width | > 0,3 mm | > 0,2 mm |
| Printing tolerance according to ISO 2768-1 (mm) | ||
| <120 (mm) | ± 0,15 | |
| 120 – 400 (mm) | ± 0,2 | |
| >400 (mm) | ± 0,3 | |
| Permitted variation of line thickness | < 10% | < 5% |
| Smoothness | Visual contaminations are not permitted. Raised areas are acceptable only over conductive strips exits. | |
| Colour covering | The colour coverage is sufficient, when underneathed layers are invisible. | |
| Colour reproduction | ΔE 3 | ΔE 6 |
| Enviromental influence (faults) – max | 0,25 mm2 | |
| Minimum distance between faults | 50 mm | |
| Number of faults in window area <1dm2 | 1 | |
| Number of faults in window area ≥1dm2 | 2 / dm2 | |
| Colours overlapping | Due to printing technology, overlapping is necessary and permitted | |
| Colours | RAL, PANTONE | |
| Graphic design | as requested | |
Glass
| External dimensions tolerance according to ISO 2768-1 (mm) | |
| <120 (mm) | ± 0,15 |
| 120 – 400 (mm) | ± 0,2 |
| >400 (mm) | ± 0,3 |
| Edge shape | C-grind, trapeze |
| Thickness | > 1mm |
| Surface properties | 1 mm chemical tempered; >2mm thermal tempered |
| Coating | Antiglar, Antyrefleks and special coating |
Chemical substances that membrane keyboards are resistant to:
| Chemical substances | Foodstuff and others |
| acetone | coffee |
| methyl ethyl ketone | tea |
| toluene | mustard |
| dichloromethane | ketchup |
| isopropyl alcohol | tomato juice |
| cyclohexanone | citrus fruit juice |
| ethyl acetate | grape juice |
| xylene | vinegar |
| sodium hydroxide [40%] | milk and milk products |
| hydrochloric acid | detergents |
| petrol | blood |
| potassium chloride | |
| butyl cellosolve |