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Tape Glossary | How to Measure Adhesion | How to Make a Pressure Sensitive Tape
How to Measure Adhesion
PEEL Adhesion:
Resistance to peel is determined by measuring the force required to peel away
a strip of tape from a rigid surface. The amount of force needed to remove
the tape, peeled at 180 degrees at specified speed, yields a value measured
in English or metric units.
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SHEAR Adhesion:
Shear adhesion- or holding power can be characterized as a resistance to
flow or movement under stress. Shear is measured by the amount of time
necessary
for a tape sample to separate from a parallel test surface to which it has
been adhered.
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QUICK Adhesion:
Quick Stick is the property of a pressure sensitive tape which causes the
tape to adhere to a surface instantly, using no external pressure to secure
more
thorough contact. Measured in oz/in. as the force required to remove the
tape at a 90-degree angle from a stainless steel panel.
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TENSILE Strength
A Tensile Strength test is used to determine the amount of stretch a tape
has. Tensile strength is the amount of force it takes to break a 1” wide piece
of tape. It is measured by pulling a piece of tape by the ends to determine
the amount of elongation the tape can withstand before breakage occurs.
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TESTING METHOD
Most of the above tests require that a 1” wide piece of tape be applied
to a clean stainless steel slide be used to mount the tape on prior to testing.
A Roll Box is then used to apply a consistent amount of pressure on the tape
so it is adhered to the stainless steel plate properly before the test is performed.
This ensures consistent test data results.
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SURFACE ENERGIES:
Surface energy principles and their relationship to pressure sensitive tapes
are fundamental to product performance and the basics of adhesion.
Bond strength is improved by the adhesive’s ability to easily
flow (“wet
out”) over the surface to which it has been applied. Accordingly,
high-energy surfaces will develop higher bond strengths than low
energy surfaces. However,
bond strength to lower energy surfaces can be enhanced by various
methods, i.e. corona treatment, primer coating, chemical etching
and mechanical
abrasion.
Other factors that will affect your adhesion values are
contamination on the surface, film thickness, substrate conformability,
temperature,
humidity,
time,
and possibly even the application technique itself.
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PLASTICS:
High Surface Energies |
Low Surface Energies |
| Kapton ™ (polyimide) |
Poly Vinyl Acetate (PVA) |
| Phenolic |
Polystyrene |
| Nylon |
Acetal |
| Alkyd Enamel |
Ethyl Vinyl Acetate (EVA) |
| Polyester |
Polyethylene |
| Epoxy Paint |
Polypropylene |
| Polyurethane |
Tedlar™ (Polyvinyl Flouride) |
| Acrylonitrile Budadiene Styrene (ABS) |
Teflon™ (PTFE) |
| Polycarbonate (Lexan) |
Ultra High Molecular Weight |
| Poly Vinyl Chloride (PVC) |
Polyethylene (UHMW) |
| Noryl |
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| Acrylic |
| Polane Paint |
The following web site is a helpful resource when converting
measurements.
http://www.onlineconversion.com/ Back to Top
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