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Customer Gard Group
Product PPS
Dell Tech Lab Code # 00-0023
Report Date March 3, 2000
Test Contact angles in distilled water of 5 painted panels treated with PPS.
Objective To determine the durability of PPS after 100, 125, and 150 passes with the Gardner Abrasion Tester.
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.
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.
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 23C 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 90 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 90. 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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