AASHTO T 338-09 (2019) PDF Download

AASHTO T 338-09 (2019) is a standard method of test that focuses on the analysis of structural steel coatings for Hindered Amine Light Stabilizer (HALS). HALS is a type of additive used in coatings to provide protection against the effects of UV radiation.

The purpose of this standard is to determine the presence of HALS in the polyol portion of a two-component acrylic urethane coating. The test method specified in AASHTO T 338-09 (2019) involves extracting the polyol portion of the coating and subjecting it to gas chromatography-mass spectrometry (GC-MS) analysis.

GC-MS is a technique used to separate and identify individual components of a mixture. In this case, it is used to identify the specific HALS additive present in the coating. By quantifying the HALS content, the effectiveness and durability of the coating can be assessed.