3M
7979
***Discontinued*** Membrane Switch Spacer
Discontinued A 9.0 mil. polyester backed tape with #600 "isotac" acrylic adhesive primarily used for membrane switches and keyboards. Isotac adhesive for switches must withstand high temperatures of harsh chemical environments. The 2.0 mils. of adhesive on each side of backing ensures secure bond that prevents channeling or buckling. 7979 tape has high internal strength to withstand repeated stresses from switch actuation. Use steel rule die cutting and sharp, lubricated dies through processing, and a combination of metal and rubber rollers with moderate pressure is recommended.
| Backing/Carrier | PET - Polyester |
|---|---|
| Adhesive | Acrylic |
| Thickness | 9 Mils |
| Tensile | |
|---|---|
| Elongation | |
| Adhesion (liner) | 85 oz/in |
| Adhesion (unwind) | 85 oz/in |
| Min. Application Temp | 50° F |
|---|---|
| Min. Service Temp | -40° F |
| Max Short-Term Temp | 400° F |
| Max Long-Term Temp |
Product Features
- 5.0 mil. polyester backing
- 2.0 mil. #600 "isotac" acrylic adhesive coated on both sides
- 90° surface adhesion to aluminum: 46 oz./in.
- Surface adhesion to painted metal: 67 oz./in.
- Surface adhesion to phenolic: 79 oz./in.
- Surface adhesion to ABS: 39 oz./in.
- Surface adhesion to lexan: 61 oz./in.
- Surface adhesion to polypropylene: 21 oz./in.
- Surcace adhesion to HDPE: 20 oz./in.
- Static shear: 1000 gms at 72°F- 10,000 min.
- Static shear: 500 gms at 158°F- 10,000 min.
- Good die cutting
- Excellent processability
- Bond will hold securely after exposure to gasoline, oil, grease, kerosene, JP-4 fuel, mild acids, alkalis and most aromatic and aliphatic solvents
- Bond strength increases with exposure to water and humidity
- Adhesive performance is not effected by UV light
Adhesive Tape Applications
- Flat and tactile membrane switches
- Full travel keyboards
- Flexible membrane switches
Converting Services
Precision Cutting, Die Cutting, Slitting, Printing, Laminating and Coating, Spooling and Finishing, Consulting & Process Audit, Prototyping, Inventory Management
At Budnick, we specialize in custom converting these materials into labor saving, user-friendly parts.
Data provided by Budnick Converting, Inc.
The physical properties listed are typical values and are not to be considered as specifications. Our suggestions for use are based on tests we believe to be reliable. However, the purchaser must carry out their own tests to determine the suitability of the product for their internal use. Information is given in good faith, but without warranty.
It is essential, as with all pressure-sensitive tapes, that the surface to which the tape is applied be clean, dry and free of grease and oil.
Shelf life from date of manufacture is based on the product being stored at 70°F(21°C) / 50% relative humidity out of direct sunlight.
Specification compliance is dynamic and should only be used as a general guide. Always confirm that the tape you are interested in currently complies with all specification requirements. Please verify that the product number that you select is available in the proper size and color to meet your specification.