ASTM G85 is the ASTM standard for Modified Salt Spray (Fog) Testing, a practice used to evaluate how materials and coatings respond to a controlled corrosive fog environment. It helps define a repeatable method for comparing corrosion resistance under modified salt spray conditions, making it useful for quality control, product evaluation, and specification work. For teams assessing durability, this standard provides a common technical reference for consistent testing and reporting.

Overview of ASTM G85

The Standard Practice for Modified Salt Spray (Fog) Testing describes a test approach centered on exposure to a salt spray or fog environment that is modified from a basic salt fog procedure. In practical use, ASTM G85 supports controlled corrosion testing where repeatability and comparability are important. It is commonly selected when organizations need a standardized way to assess how materials, finishes, or protective systems perform under accelerated corrosive exposure conditions.

Common use cases of ASTM G85

ASTM G85 is commonly used in laboratories, quality control programs, and product development workflows where corrosion performance must be checked in a standardized fog-testing environment. It may be applied to coated parts, finished components, and other materials that need evaluation for resistance to salt-related exposure. The standard is also useful when comparing candidate materials or verifying that a product meets internal or procurement requirements for corrosion-related performance.

Benefits of using ASTM G85

Using ASTM G85 supports consistency in corrosion testing, which is important when results are used for compliance, supplier qualification, or design decisions. A recognized ASTM standard helps reduce ambiguity in test setup and reporting, improving communication between buyers, manufacturers, and testing labs. It also gives teams a clearer basis for comparing products and monitoring coating or material performance over time, which can help reduce risk in selection and approval processes.

• Modified salt spray fog exposure
• Standardized corrosion test practice
• Useful for coatings and materials evaluation
• Supports repeatable quality checks
• Helps compare performance results