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EMS Technical Data Sheets
Silver Conductive Adhesive 478SS
EMS #12685-15
The Silver Conductive Adhesive 478SS is a conductive, silver-based polymer. It is a thick film ink that is used to conduct screen printing onto membrane switches. It can be heat cured for maximum performance. In addition, it is compatible with surface mount epoxy systems, has an extended screen residence time, has a high Tg to prevent any blocking, has outstanding creasability, excellent adhesion to polyester film, and has a very low sheet resistance, Furthermore, it has superior abrasion resistance and hardness.
Instructions
Curing
This product is made ready to use. If thinning is necessary, dilute 5% by weight with Carbitol Acetate. When finished, you may clean the equipment used with MEK, MIBK, Acetone or solvents alike.
Screen Printing Process
You may apply this product by the standard screen printing process. Dried thickness and final resistance may vary due to the following: screen mesh size, squeegee material, screen material, and emulsion thickness.
| Recommended thickness, dried, µm | 7.5 to 12.5 |
| Emulsion thickness, solvent resistant emulsion, µm | 20 to 37.5 |
Screen Type
| Monofilament polyester screen, mesh | 157 to 280 |
| Stainless steel screen, mesh | 165 to 325 |
Squeegee
| For use on polyester screens, durometer | 60 |
| For use on stainless steel screens, durometer | 70 |
Technical Information
Composition properties
Uncured Material
| Solids content by weight, % | 73% |
|
Viscosity, Brookfield – RVT, 25°C, mPas (cP): |
20,000 |
| Density, kg/l | 2.52 |
|
Shelf life at -12 to 27°C (from date of qualification in original seal), days |
365 |
| Flash point, Tag closed cup flash tester, °C | 110 |
Cured Material
| Physical properties | |
| Pencil hardness | B |
| Theoretical coverage at 25 µm coating thickness | |
| Sq. ft./gal | 555 |
| m2/kg | 5.41 |
| Electrical properties | |
| Sheet resistance, 25 µm thickness, ohms/sq | <0.015 |
Product Information
Silver Conductive Adhesive 478SS