Scotch™
Single Side Membrane Switch Spacer 7993MP
Product Data Sheet
Updated
: July 2000
Supersedes : November 1994
Physical Properties
Carrier
1.0 Polyester
Adhesive
2.0 #200 “High Performance” Acrylic
Liner
90# Bleached Kraft
Shelf Life
24 months from date of manufacture by 3M if stored at
room temperature condition in cool, dry and sun protected
room.
Not for specification purposes
Features:
Applications
•
Long term, environmentally stable adhesive to resist UV. light, chemicals, and
temperatures to 300°F (149°C).
•
High cohesive strength of the adhesive withstands repeated stresses of switch
actuation.
•
Add a different thickness of adhesive to one side of a membrane switch to build a
membrane switch spacer.
•
Designed for use as a substrate for membrane switch circuitry.
•
Hold metal domes in place.
•
Protect conductive leads.
2
Date : July 2000
Single Side Membrane Switch
Spacer 7993MP
Initial Adhesion
Dynamic Peel - 180° Peel
Not for specification purposes
(ASTM D-3330, PSTC3)
Properties and
Performance
Temperature Range
Low : -40°F (-40C)
High Long Term (days/weeks) : 250°F (121°C).
High Short Term (minutes/hours) : 300°F (149°C).
Chemical Resistance
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.
Not for specification purposes
Stainless Steel N/10mm
3.6
Not recommended for total immersion.
Processing
Moisture & Humidity
Resistance
No adverse effect on the bond after exposure to 100%
Relative Humidity at 38°C.
Bond Build Up
The bond strength of Scotch #200 Hi-Performance Acrylic
adhesive increases as a function of time and
temperature.
U.V. Resistance
Adhesive is very resistant to oxidisation and ozone when
exposed to air or sunlight (U.V.).
Die-cutting:
Steel rule or punch press die-cuttable.
Roll Laminating:
Use rubber over steel roll set up with firm application pressure. Make adhesive to
substrate contact at nip area only to exclude air entrapment.
3
Date : July 2000
Single Side Membrane Switch
Spacer 7993MP
Other Considerations
Bond strength is dependent upon the amount of adhesive-to-surface contact developed.
Firm application pressure develops better adhesive contact and thus improves bond
strength.
To obtain adhesion, the bonding surfaces must be clean, dry, and smooth. Some typical
surface cleaning solvents are isopropyl alcohol or heptane. Consult manufacturer's
Material Safety Data Sheet for proper handling and storage of solvents.
Ideal tape application temperature range is 70°F (21°C) to 100°F (38°C) Initial tape
application to surfaces at temperatures below 50°F (10°C) is not recommended because
the adhesive becomes too firm to adhere readily. However, once properly applied, low
temperature holding is generally satisfactory.
3M is a trademark of the 3M Company.
Values presented have been determined by standard test methods and are average values not to be used for specification purposes.
Our recommendations on the use of our products are based on tests believed to be reliable but we would ask that you conduct your own tests to
determine their suitability for your applications.
This is because 3M cannot accept any responsibility or liability direct or consequential for loss or damage caused as a result of our
recommendations.
3M United Kingdom PLC 2000
Tapes & Adhesives Group
3M United Kingdom PLC
3M House, PO Box 1,
Market Place,
Bracknell, Berkshire,
RG12 1JU
Product Information :
Tel 0870 60 800 50
Fax 0870 60 700 99
3M Ireland
3M House, Adelphi Centre,
Upper Georges Street,
Dun Laoghaire, Co. Dublin,
Ireland
Customer Service :
Tel (01) 280 3555
Fax (01) 280 3509
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