USE

　　To coat automobile exteriors, making their appearance more attractive.

　　TEST EQUIPMENT

　　Viscometer:   High Torque CAP 2000+L

　　Spindle:   Cone 01 (CAP-S-01)

　　Speed:   750 and 900 RP　

　　Temperature: 25°C

　　TEST METHOD

　　Paint is tested at high shear rates (10,000 -12,000 s-1),   to simulate the flow behavior that paints undergo   while being sprayed. The test methods that we used   were based upon the standard test methods set forth   by ASTM D4287 (common standard in North America)   which is run at 12,000 s-1, and the standard test methods   set forth by ISO2884 and BS3900 (common standards in   Europe), which are run at 10,000 s-1.

　　We used a High Torque CAP 2000+L viscometer, with Capcalc software for automated instrument control and data   acquisition. We used Cone 01 to achieve on-scale results with 67 μL of fluid sample. The cone and plate were cleaned   before dispensing each paint portion. A fresh portion of sample was used for each trial. Three trials were done for each   speed. We equilibrated the sample and cone at 25°C for 30 seconds prior to testing. The solvent trap was used to help   prevent evaporation. Representative data from the analyses are shown in Figures 1, 2, and 3.

　　Figure 1 shows the data obtained by the standard test method described by ISO 2884 more commonly used in Europe

　　Figure 1: Standard ISO 2884 Test Method

　　Figure 2 shows the data obtained by the standard test method described by ASTM D4287 more commonly used in   North America.

　　Figure 2: Standard D4287 Test Method

　　Figure 3 plots Run 1 of Figures 1 and 2.

　　Figure 3: Test Method Comparison:   ISO 2884 vs. ASTM D4287

　　Figure 3 shows that the viscosity obtained in ISO 2884 is slightly higher than ASTM D4287.   The slight increase in viscos-   ity over time may be attributed to solvent evaporation from the paint sample.