ASTM D4290 – Standard Test Method for Determining the Leakage Tendencies of Automotive Wheel Bearing Grease Under Accelerated Conditions
Description:
Significance and Use
5.1 This test method differentiates among wheel bearing greases having distinctly different high-temperature leakage characteristics. It is not the equivalent of longtime service tests.
5.2 This test method has proven to be helpful in screening greases with respect to leakage tendencies for automotive wheel bearing applications.
Note 1: It is possible for skilled operators to observe changes in grease characteristics that can occur during the test, such as grease condition. Leakage is reported as a quantitative value, whereas the evaluation of grease condition is subject to differences in personal judgment among operators and cannot be used effectively for quantitative measurements.
Scope
1.1 This test method covers a laboratory procedure for evaluating leakage tendencies of wheel bearing greases when tested under prescribed conditions.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. The exception is apparatus dimensions, in inches, which are to be regarded as the standard.
ASTM D429