5 mil total thickness spacer is ideal for withstanding repeated stress of switch actuation
1 mil polyester film carrier provides strength and stability
2 mil acrylic adhesive on each side delivers excellent shear strength, resists slippage and edge lifting
Adhesive resists oozing at edges and die-cuts for faster part processing
Layflat 58# polycoated kraft (PCK) liners add dimensional stability for various die-cutting operations
3M™ Membrane Switch Spacer 7945MP features 3M™ High Performance Acrylic Adhesive 200MP, formulated for excellent shear strength, on a 1 mil PET film carrier. This adhesive withstands repeated switch actuation and forms neat, clean edges for precise slitting and die-cutting. Double PCK paper liners resist humidity, curling, tunneling and buckling, and add stability for improved sheet processing.
A Top Performer Before, During and After Application
Featuring 3M™ High Performance Acrylic Adhesive 200MP, our 3M™ Membrane Switch Spacer 7945MP is ideal for the stresses of switch actuation over long periods. The adhesive on this double-sided spacer is formulated for excellent shear strength — forming a durable bond with plastics and other smooth surfaces with less oozing at the edges. This allows for easier slitting and die-cutting, faster part processing and minimal waste. The adhesive is applied at 2.0 mils to each side of a 1.0 mil polyester film carrier which adds structural strength.
Double 4.2 mil 58# polycoated kraft (PCK) paper lay-flat liners are designed to cover adhesive consistently for full bonding performance after application. Liners resist curling, tunneling and buckling, increase dimensional stability and hold up even under high humidity for efficient storage and processing. Liner design also enables improved rotary die-cutting at high speeds, as well as improved sheet processing.
Membrane switch spacers
Circuit layer assembly
Metal dome placement
Resilient and Ready
3M™ Membrane Switch Spacer 7945MP is constructed with 2.0 mil high performance acrylic adhesive that is coated on each side of a 1.0 mil polyester film carrier. This membrane switch spacer comes double-linered with a 4.2 mil, 58# moisture-resistant, lay-flat, PCK paper. Designed to separate switch circuitry until actuation, our Membrane Switch Spacer 7945MP provides excellent temperature resistance (up to 400°F/204°C short-term heat resistance), solvents and UV resistance.
About Our High Performance Acrylic Adhesive 200MP
3M™ High Performance Acrylic Adhesive 200MP is an industry standard for graphic attachment and general industrial joining applications. It features outstanding adhesion to metal, polycarbonate (PC), ABS and polyester (PET). making it a popular choice across many industries. This adhesive provides some initial repositionability for placement accuracy when bonding to plastics. It also performs well after exposure to humidity and hot/cold cycles, providing confidence that the switch will perform through difficult environmental conditions (PDF, 619.19 Kb) and millions of actuations.
The Right Choice for a Range of Applications
With low cost, long life, outstanding environmental performance and eye-catching graphics, membrane switches are found in more and more applications. They range from farm tractors and medical test systems to microwave ovens and fish finders. Whatever the need, 3M has a membrane switch construction suited for the job. 3M has a full range of spacers to meet most membrane switch design requirements.
Better Science for Better Adhesives from 3M
Since 1925 when one of our lab assistants invented masking tape, 3M has been applying science to life — developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single 3M engineer now spans decades and generations. And all of it goes into each of our industrial labeling and adhesive products like 3M™ Membrane Switch Spacer 7945MP, to help businesses like yours operate faster, better and more efficiently.
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Get Data for Finite Element Analysis
Pressure Sensitive Adhesive properties are frequency and temperature sensitive. 3M has developed Material Data Cards (MDCs) for common 3M PSAs for use with many commercially available FEA software applications. Learn more.