7979, Membrane Switch Spacer, 3M, adhesive tape datasheet

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3M 7979
Membrane Switch Spacer

General Information

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	Adhesive (unwind)	Thickness (total)	Liner Type (outer)
PET - Polyester	Acrylic	9.00 mil	Paper (58# polycoated kraft, printed)

Adhesion to Steel 180° Peel	adhesion to steel 180° peel - liner side	Tensile Strength	Elongation Percent
85.00 oz/in	85.00 oz/in

Min Application Temp	Min Service Temp	Max Short-Term Temp	Max Long-Term Temp
50 °F	-40 °F	400 °F

Adhesive Tape 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

Adhesive Tape Markets Served

Adhesive Tape Colors

Comparable products

3M 7979

Membrane Switch Spacer

Backing	Adhesive	Thickness	Adhesion
PET - Polyester	Acrylic	9.00mil	85.00oz/in

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Budnick Converting offers a number of services to take the product you need and make it perfect for your application. With converting methods ranging from precision slitting or die-cutting to printing and coating, Budnick has the capabilities to create anything you can dream up.

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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.