The ASTM G11-19 standard is designed to evaluate the Stability of pipe coatings under outdoor efflorescence conditions. Since coatings may be stored outdoors for long periods of time, this test simulates the effects of efflorescence under different climate conditions. The test results provide a general trend in the effects of efflorescence on coatings, taking into account differences in exposure time and climate change. The standard specifies the eligibility of samples, exposure procedures, and methods for assessing the effects of efflorescence, helping to understand the long-term weather resistance performance of coatings.