Premium 5 mil double-sided membrane switch spacer with high-performance acrylic adhesive, polyester film carrier, and lay-flat kraft liners for reliable switch actuation and die-cutting applications.
The 3M™ Membrane Switch Spacer 7945MP is a premium double-sided adhesive spacer designed for high-performance membrane switch applications requiring repeated stress and actuation cycles. This industrial-grade product features a 5 mil total thickness construction with a 1 mil polyester film carrier and 2 mil high-performance acrylic adhesive (3M™ High Performance Acrylic Adhesive 200MP) applied to each side. The spacer is engineered to withstand demanding switch actuation environments while maintaining excellent shear strength and preventing edge lifting and slippage.
The product comes with double 4.2 mil 58# polycoated kraft (PCK) paper lay-flat liners that provide superior dimensional stability and resist humidity, curling, tunneling, and buckling. These liners ensure consistent adhesive coverage and enable efficient rotary die-cutting at high speeds. The transparent color allows for visual inspection of component placement, while the 1,219.2 mm (48 inch) overall width accommodates various manufacturing scales and die-cutting operations. The adhesive formulation resists oozing at edges, enabling faster part processing with minimal waste.
Designed for industrial and occupational use, the 3M™ Membrane Switch Spacer 7945MP operates effectively across a wide temperature range from -40°C to 204°C (-40°F to 400°F) and provides excellent resistance to solvents and UV exposure. With an 18-month shelf life and delivered as a roll in standard configuration, this product is ideal for membrane switch construction, switch mounting, circuit layer assembly, metal dome placement, lead protection, and die-cut laminations across aerospace, appliance, automotive, electronics, medical, and other industrial sectors.
Key Features
- 5 mil total thickness ideal for withstanding repeated switch actuation stress
- 1 mil polyester film carrier provides superior strength and structural stability
- 2 mil high-performance acrylic adhesive on each side delivers excellent shear strength
- Double-sided adhesive resists slippage, edge lifting, and oozing for clean processing
- Double 4.2 mil 58# polycoated kraft paper liners resist humidity, curling, and tunneling
- Transparent color allows visual inspection of component placement
- Temperature resistant from -40°C to 204°C for demanding environments
- Excellent UV and solvent resistance for long-term performance
- Lay-flat liner design enables high-speed rotary die-cutting
- Clean edges and minimal waste for faster part processing
Technical Specifications
| Specification |
Value |
| Product Number | 7945MP |
| 3M ID | 7100000069 |
| Product Type | Membrane Switch Spacer |
| Adhesive Type | High Performance Acrylic Adhesive 200MP |
| Backing Material | Polyester Film (PET) |
| Backing Thickness | 1 mil (0.03 mm) |
| Face Side Adhesive Thickness | 2 mil (0.05 mm) |
| Back Side Adhesive Thickness | 2 mil (0.05 mm) |
| Total Tape Thickness without Liner | 5 mil (0.13 mm) |
| Number of Adhesive Sides | Double-sided |
| Primary Liner Material | 58# Polycoated Kraft Paper (PCK) |
| Primary Liner Thickness | 4.2 mil (0.11 mm) |
| Primary Liner Color | Tan |
| Secondary Liner Material | 58# Polycoated Kraft Paper (PCK) |
| Secondary Liner Thickness | 4.33 mil (0.11 mm) |
| Secondary Liner Color | Tan |
| Overall Width (Imperial) | 48 inches |
| Overall Width (Metric) | 1,219.2 mm |
| Product Color | Transparent |
| Maximum Operating Temperature | 204°C (400°F) |
| Minimum Operating Temperature | -40°C (-40°F) |
| Short-term Heat Resistance | 400°F (204°C) |
| Indoor/Outdoor Rating | Indoor/Outdoor |
| Shelf Life | 18 months |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Adhesion Properties | Outstanding adhesion to metal, polycarbonate, ABS, and polyester |
| Environmental Resistance | Excellent UV and solvent resistance |
| Humidity Performance | Performs well after exposure to humidity and hot/cold cycles |
| Repositionability | Some initial repositionability for placement accuracy on plastics |
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