SP-7533 PRODUCT SPECIFICATION
3M SP-7533
SP-7533
Heat Resistance Water Based
Screen Printable Adhesive
Description:
SP-7533 is a screen printable emulsion based adhesive that
offers excellent adhesion, superior high temperature performance.
Superior adhesion on polyester, ABS and other High Surface
Energy plastic.
Superior high temperature performance.
Offers excellent screen printability, can be printed with
very fine screen pattern.
Does not attack ink and substrate surface since this is
a water based product.
Does not contain solvent and therefore does not emit toxic
gas during processing.
Characteristics:
|
Material
|
Acrylic based polymer
|
|
pH
|
approx. 7.0
|
|
Solid content
|
65%
|
|
Flash Point
|
N.A.
|
|
Solvent
|
Water
|
|
Specific Gravity
|
1.02
|
|
Viscosity
|
approx. 35,000 cps
|
|
Colour
|
milky white
|
Application:
Attachment of graphic overlay in membrane switch applications in automobile,
electrical goods and industrial equipments.
Attachment of low foaming materials.
Plastic and stainless steel panels attachment.
Equipment:
Screen printing machine is recommended for applying the adhesive.
Other Printing Accessories:
Stainless steel screen with 70 to 150 mesh is recommended.
(polyester screen mesh can also be used)
The best thickness (dry film) is 35 to 70 micron. Thinner
coat of adhesive will result in lower adhesion strength. Thicker coat of
adhesive can be achieved by controlling emulsifier thickness or squeegee
pressure.
Since this is a water based adhesive, water resistant emulsifier
and masking agent must be used.
Printing:
Ensure that the printed surface is free of dirt, oil, grease
and other contaminants.
Stir the adhesive well before use.
Apply suitable amount of adhesive on the screen and ensure
continuous production run to prevent drying of adhesive on screen. Drying
on screen will increase the adhesive viscosity and result in poor printability.
Discard excess adhesive left over from each production
run. Please DO NOT transfer excess adhesive back to the container.
Drying:
70 deg. C for about 5 minutes
50 deg. C for about 15 minutes
(applicable when printed using #100 mesh stainless steel
screen)
Drying time is dependent on the coating thickness and substrates.
The adhesive will turn from milky white to transparent upon drying. This
can be used as a good indication as to when the adhesive can be applied
onto the substrate surface.
Application on substrate surface:
Ensure that the substrate surface is free of dirt, oil,
grease and other contaminants.
Ensure sufficient pressure is being applied.
In cases where liner is being used, ensure that the release
coating does not migrate to the adhesive.
Cleaning of screen mesh
Clean the screen mesh immediately with water after each production
run. Adhesive dried on the screen and inside the mesh can be removed using
cleaner 30 and then rinsed with water. Better result can be achieved using
air blower for cleaning.
Performance characteristics:
1. 180 deg. peel strength
Substrate: 100 micron polyester film/various substrates
Test sample: 35 micron adhesive, 2kg roll - 6 times, dried
at 70 deg. C for 20 minutes
Conditioning: 50 deg. C for 24 hours
Testing conditions: peel rate - 300 mm/minutes at 25 deg.
C
|
Substrate
|
Peel strength (kgf/25mm)
|
|
Stainless steel
|
2.9
|
|
ABS
|
1.3
|
|
Rigid PVC
|
2.4
|
|
Polycarbonate
|
1.3
|
2. Aging resistance ¡V 180 deg. peel strength
Substrate: 100 micron polyester film/ABS
Test sample: 35 micron adhesive, 2kg roll ¡V 6 times, dried at 70 deg.
C for 20 minutes
Testing conditions: peel rate ¡V 300 mm/minutes at 25 deg. C
|
Conditioning
|
Peel strength (kgf/25mm)
|
|
Initial (50 deg. C for 24 hours)
|
1.3
|
|
80 deg. C for 1000 hours
|
2.5
|
|
60 deg. C at 95% R.H. for 1000 hours
|
1.5
|
|
Water immersion at 40 deg. C for 1000 hours
|
1.4
|
3. High temperature shear strength
Substrate: 100 micron polyester film/Stainless Steel
Test sample: 35 micron adhesive, 2kg roll ¡V 6 times, dried at 70 deg.
C for 20 minutes
Testing conditions: Place sample with 25mm X 25mm adhesion area into oven.
Oven temperature was programmed to increase at a
rate of 2 deg. C/5 minutes.
Note the temperature when the weight falls.
|
Weight
|
Temperature (deg. C)
|
|
1 kg
|
77.4
|
|
500 g
|
138.6
|
Storage:
Do not freeze product.
Store product between 5 to 35 deg. C.
Keep container tightly closed when not in used.
Warning:
This product may caused eye irritation.
Safety precaution:
Avoid eye contact and prolong skin contact.
First Aid:
In case of eye contact immediately flush eyes with plenty
of water. If irritation persist, call a physician.
~END~
REV0400
