Budnick Converting ®
3M
7961MP
Membrane Switch Spacer
An 11.0 mil. polyester backing tape with #200 hi-performance acrylic adhesive primarily used as a spacer for membrane switch/ keyboard circuits. Solvent resistance is excellent when this product is properly applied to impervious materials. The adhesive resists softening through edge contact with mild acids, alkalis, oil, gasoline, Kerosene, JP-4 fuel and many other solvents. Total tape immersion in chemicals and solvents is not recommended. The bond strength is dependent upon the amount of adhesive-to-surface contact developed, firm application pressure develops better adhesive contact and therefore improves bond strength. Initial tape application below 50°F is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.
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.
| Backing/Carrier | PET - Polyester |
|---|---|
| Adhesive | Acrylic |
| Thickness | 11 Mils |
| Tensile | |
|---|---|
| Elongation | |
| Adhesion (liner) | 114 oz/in |
| Adhesion (unwind) | 114 oz/in |
| Min. Application Temp | 50° F |
|---|---|
| Min. Service Temp | -40° F |
| Max Short-Term Temp | 300° F |
| Max Long-Term Temp | 250° F |
Product Features
- 7.0 mil. polyester backing
- 2.0 mil. #200 acrylic adhesive coated on both sides
- Dielectric strength: 1.5 KV/ mil.
- Insulation resistance: 2.5 x 10 ohms
- Volume resistivity: 1.1 x 10 ohms-cm
- Surface resistivity: 1.1 x 10 ohms/ square
- 90° peel adhesion to stainless steel: 68 oz./in.
- 90° peel adhesion to epoxy: 74 oz./in.
- 90° peel adhesion to polyester: 62 oz./in.
- 90° peel adhesion to polycarbonate: 122 oz./in.
- 90° peel adhesion to ABS: 90 oz./in.
- Long term environmentally stable bond
- High cohesive strength to withstand repeated stresses from switch activation
- High bond strength to high surface energy plastics such as polyester and polycarbonate
- Bond strength not effected by moisture and humidity
- Bond strength increases as a function of time and temperature
- Adhesive is resistant to oxidation and ozone when exposed to air or sunlight.
Adhesive Tape Applications
- Spacer for membrane switch/ keyboard circuits
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.