ASTM B311 is the ASTM standard that covers the Standard Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity. It provides a defined approach for evaluating density in PM materials where porosity is very low, helping users compare results consistently. This matters for quality control, product verification, and engineering decisions where density can reflect material integrity and process performance.

What is ASTM B311?

ASTM B311 is a test method focused on determining the density of powder metallurgy materials with less than two percent porosity. In practical terms, it is intended for PM products that are relatively dense and therefore need a suitable method for density measurement. As an ASTM standard, it supports consistent testing practices and helps reduce variation when reporting results. ASTM B311 is commonly used as a technical reference when density is part of acceptance, evaluation, or comparison activities.

Where is ASTM B311 used?

This standard is used in powder metallurgy workflows where low-porosity materials must be assessed for density. It is relevant in testing laboratories, manufacturing quality control, and product evaluation settings that work with PM parts or materials. ASTM B311 may be used during incoming inspection, process monitoring, or final verification when density is an important property. It is most useful when a clear, standardized test method is needed for materials that fall within the standard’s low-porosity scope.

Why is ASTM B311 important?

ASTM B311 helps bring consistency to density testing for powder metallurgy materials that contain very little porosity. That consistency supports more reliable comparisons between batches, suppliers, and test results. For procurement and compliance purposes, a recognized ASTM standard can also improve confidence in reported data. In quality control, the method may help identify process drift or verify that a material meets expected performance targets without relying on informal or variable testing practices.

• Density testing for low-porosity PM materials
• Standardized measurement method
• Quality control and verification use
• Comparable results across testing programs
• Technical reference for PM material evaluation