ASTM D660

ASTM D660 is the ASTM standard titled Standard Test Method for Evaluating Degree of Checking of Exterior Paints, and it provides a consistent way to assess one visible form of coating deterioration. This matters because checking can affect the appearance and perceived durability of exterior paint finishes, making a reliable evaluation useful for product comparison, quality control, and field or laboratory review. ASTM D660 helps bring structure to that assessment so results are easier to communicate and apply.

Overview of ASTM D660

The purpose of ASTM D660 is to address the evaluation of checking in exterior paints using a defined test method. In practical terms, it supports a more uniform way to judge the extent of surface cracking or checking that may develop on painted exterior surfaces over time. For manufacturers, specifiers, and testing laboratories, this standard helps create a common technical reference for comparing performance, documenting condition, and supporting product evaluation in a consistent manner.

Common use cases of ASTM D660

ASTM D660 is commonly used when exterior paint performance needs to be assessed against visible checking. It is often relevant in coating development, quality assurance, and acceptance testing for exterior paint systems. The standard may also be used during inspection or comparative evaluation of painted surfaces where consistent reporting is important. In these settings, ASTM D660 helps organizations use the same technical basis when reviewing surface condition and coating durability.

Benefits of using ASTM D660

Using ASTM D660 can improve consistency in how checking is evaluated and reported. That is valuable for compliance programs, procurement decisions, product comparisons, and quality control workflows. A standardized test method also helps reduce ambiguity when multiple parties need to review the same exterior paint condition. For teams managing coating performance, ASTM D660 supports clearer communication, more reliable documentation, and better-informed technical decisions.

• Evaluates degree of checking
• Applies to exterior paints
• Supports consistent inspection and reporting
• Useful for quality control and product evaluation