Automotive paint viscosity according to ASTM D4287 or ISO 2884

USE

Painting automobile exteriors, making their appearance more attractive.

TEST EQUIPMENT

Viscometer: CAP 2000 + L high torque

Brooch: Cone 01 (CAP-S-01)

Speed: 750 and 900 rpm

Temperature: 25 ° C

TEST METHOD

The paint is tested at high shear rates (10,000 -12,000 s-1), to simulate the flow behavior that paints undergo during spraying. The test methods we used were based on the standard test methods defined by ASTM D4287 (common standard in North America) which is performed at 12,000 s-1, and the standard test methods defined by ISO2884 and BS3900 (common standards in Europe), which run at 10,000 s-1.

We used a CAP 2000 + L high torque viscometer, with Capcalc software for automated instrument control and data acquisition. We used Cone 01 to get scale results with 67 L of fluid sample. The cone and plate were cleaned before dispensing each portion of paint. A new portion of sample was used for each test. Three tests were carried out for each speed. We equilibrated the sample and cone at 25 ° C for 30 seconds before testing. The solvent trap was used to help prevent evaporation. Representative data from the analyzes are presented in Figures 1, 2 and 3. The

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

Figure 1: ISO 2884 standard 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 test method D4287

Figure 3 plots execution 1 of figures 1 and 2.

Figure 3: Comparison of test methods: ISO 2884 versus ASTM D4287 La

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