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Page
1 of 4
C.1224.2453 |
| Customer |
Gard
Group |
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| Product |
PPS |
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| Dell
Tech Lab Code # |
00-0023 |
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| Report
Date |
March
3, 2000 |
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| Test |
Contact
angles in distilled water of 5 painted panels treated
with PPS. |
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| Objective |
To
determine the durability of PPS after 100, 125, and 150
passes with the Gardner Abrasion Tester. |
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| Procedure |
Gardner
Abrasion Tester - Probes treated with PPS are subjected
to 100, 125, and 150 passes with a 2% auto wash solution
and a hog-bristle brush prior to measuring contact
angles. |
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ATI
Instruments - Cahn DCA Application Software
Experimental Setup: Intialize stage, set speed @ 150
microns/second, tare balance, detect zero depth of
immersion, advance 14mm maximum, return to zero
position, and run. |
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Summary
of Method and Definition of Terms
A Cahn Dynamic Contact Angle (DCA) Analyzer is used to
determine contact angles. The electrobalance unit of the DCA
Analyzer produces a record of the change of weight per unit of
length as the treated solid probe advances and recedes in
distilled water. From this record the contact angles at the
liquid/solid interface are calculated. The solid substrate
used is a painted panel, coated with PPS and air dried at
23ºC for 48hours. The solid probe is coated once and used
successively for the contact angle measurements after 100, 125
and 150 passes on the Gardner Abrasion Tester with a 2% auto
wash solution and hog-bristle brush, followed with a tap water
rinse and air dried at room temperature. The procedure used
measures the contact angle in order to determine the degree of
wettability of a surface. Contact angles also give an
indication of the degree of cleanliness of a surface. The contact
angle is the angle the liquid surface makes with the solid
support; it characterizes the interaction between a solid and
a liquid surface at the interface. A contact angle larger than
90º indicates no wetting or, in other words, the solid
substrate shows repellency for the liquid. The liquid will wet
the solid, at least partially, when the contact angle is
smaller than 90º. The tendency to wet increases with a
decreasing contact angle. The difference between the advancing
and the receding contact angle is called hysteresis.
This
report shall not be reproduced except in full, without the
written approval of the laboratory. |
Canadian General Standards
Board Laboratory Accesptance Program |
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