Premium 9 mil double-coated membrane switch spacer with white metallized polyester carrier and high-performance acrylic adhesive for reliable switch actuation and graphics applications.
The 3M™ Membrane Switch Spacer 7966MWS is a premium double-coated adhesive spacer designed for separating switch circuitry until actuation. Featuring a 2 mil white polyester film carrier with metallized vapor coating for exceptional opacity and graphics visibility, this product delivers outstanding performance in demanding membrane switch applications. The spacer utilizes 3M's High Performance Acrylic Adhesive 200MP, applied at 2 mil on the face side and 5 mil on the back side, providing excellent shear strength and durability through millions of switch actuations.
This 9 mil total thickness spacer is engineered to withstand repeated stress and thermal cycling, with operating temperatures ranging from -40°F to 400°F. The polyester film carrier provides structural strength and stability, while the acrylic adhesive resists slippage, edge lifting, and oozing, enabling cleaner die-cuts and faster part processing. The single 4.2 mil, 58 lb. polycoated kraft (PCK) paper lay-flat liner resists humidity, curling, and tunneling, ensuring dimensional stability for efficient storage, processing, and high-speed rotary die-cutting operations.
Ideal for membrane switches found in farm tractors, medical test systems, microwave ovens, fish finders, and numerous other applications, the 3M™ Membrane Switch Spacer 7966MWS combines low cost with long life and outstanding environmental performance. This industrial-grade product is specifically designed for professional converters and manufacturers requiring reliable, precision-engineered spacers for graphic and non-graphic membrane switch applications.
Key Features
- Metallized vapor coat on white polyester carrier creates outstanding opacity for vivid graphics display
- 9 mil double-coated construction withstands repeated stress of millions of switch actuations
- Asymmetric adhesive design with 2 mil face side and 5 mil back side for optimal performance
- High Performance Acrylic Adhesive 200MP delivers excellent shear strength and edge retention
- Temperature resistant from -40°F to 400°F with superior humidity and UV resistance
- Lay-flat 58# polycoated kraft paper liner resists curling and ensures dimensional stability
- Clean die-cutting edges reduce processing waste and enable faster manufacturing
- Suitable for aerospace, automotive, electronics, medical, and industrial applications
Technical Specifications
| Specification |
Value |
| Product Type | Membrane Switch Spacer |
| Part Number | 7966MWS |
| 3M Product Number | 7966MWS |
| 3M ID | 7100073000 |
| Adhesive Type | High Performance Acrylic Adhesive 200MP |
| Carrier Material | 2 mil White Polyester Film with Metallized Vapor Coat |
| Carrier Thickness | 2 mil (0.05 mm) |
| Face Side Adhesive Thickness | 2 mil (0.05 mm) |
| Back Side Adhesive Thickness | 5 mil (0.13 mm) |
| Total Thickness without Liner | 9 mil (0.23 mm) |
| Number of Adhesive Sides | Double-sided |
| Primary Liner | 58# Polycoated Kraft Paper (PCK) |
| Liner Color | Tan |
| Liner Thickness | 4.2 mil (0.11 mm) |
| Product Color | White |
| Minimum Operating Temperature | -40°F (-40°C) |
| Maximum Operating Temperature | 400°F (204°C) short-term heat resistance |
| Shelf Life | 18 Months |
| Package Format | Roll |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Industries | Aerospace, Appliance, Automotive, Converter Solutions, Electronics, General Industrial, MRO, Medical, Metalworking, Military & Government, Point of Purchase, Print, Signage, Specialty Vehicles, Transportation, Woodworking |
| Recommended Applications | Membrane switch spacers, Graphic and non-graphic applications, Switch mounting, Circuit layer assembly, Metal dome placement, Lead protection, Die-cut laminations |
| Adhesive Properties | Excellent shear strength, resists slippage and edge lifting, resists oozing at edges for clean die-cuts |
| Environmental Resistance | Solvent resistant, UV resistant, humidity resistant, temperature cycling resistant |
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