ASTM D6138

ASTM D6138 is the ASTM standard for determining the corrosion-preventive properties of lubricating greases under dynamic wet conditions, also known as the Emcor Test. It provides a structured way to evaluate how a grease performs when exposed to moisture and motion, which is important for applications where corrosion protection is a key requirement. For buyers, engineers, and quality teams, this standard helps support more consistent product comparison and technical decision-making.

Purpose of ASTM D6138

The purpose of ASTM D6138 is to define a test method for assessing how well lubricating greases protect surfaces from corrosion when operating under dynamic wet conditions. This is particularly useful because water exposure and movement can challenge grease performance in service. By using a recognized ASTM standard, organizations can apply a common technical basis for evaluating corrosion-preventive behavior, supporting more reliable testing, specification review, and product qualification.

Common use cases of ASTM D6138

ASTM D6138 is commonly used in product testing, formulation development, and incoming or outgoing quality control for lubricating greases. It may be applied when comparing grease performance under wet operating conditions or when documenting corrosion-prevention characteristics for procurement and compliance purposes. The standard is also useful in laboratory workflows that need a repeatable method for assessing how a grease behaves when exposed to both dynamic movement and moisture-related corrosion stress.

Why ASTM D6138 matters

This standard matters because corrosion resistance is often a critical performance factor for greases used in demanding service environments. ASTM D6138 helps create a consistent basis for test results, which supports clearer product evaluation and reduces uncertainty during specification development and supplier review. For organizations managing technical requirements, using a recognized test method can improve comparability, strengthen quality control, and help reduce risk when selecting lubricating greases for wet or corrosion-sensitive applications.

• Corrosion-preventive performance under wet conditions
• Dynamic test method for lubricating greases
• Common reference for product comparison
• Useful for quality control and procurement
• Supports consistent laboratory evaluation