ASTM C867 is the standard test method for determining soluble sulfate in ceramic whiteware clays using a photometric method. It is used to measure sulfate that can be extracted and quantified in clay materials, helping support material evaluation and quality control. For producers, laboratories, and buyers working with ceramic whiteware clays, this ASTM standard offers a consistent way to assess sulfate content and compare results across testing programs.

Purpose of ASTM C867

The purpose of ASTM C867 is to provide a clear test method for measuring soluble sulfate in ceramic whiteware clays by photometric analysis. By defining a repeatable approach, the standard helps laboratories generate comparable data for clay characterization and product assessment. This can support technical decision-making when reviewing raw materials used in whiteware applications. ASTM C867 is therefore useful where reliable sulfate measurement is needed for documentation, testing consistency, and controlled material selection.

Common use cases of ASTM C867

ASTM C867 is commonly used in laboratory testing of ceramic whiteware clays, especially when sulfate content needs to be checked during material qualification or incoming inspection. It may also be referenced in quality control workflows for clay suppliers and ceramic manufacturers that need consistent analytical results. Because the method is photometric, it fits well into labs equipped for routine chemical testing and standardized evaluation of clay materials.

Why ASTM C867 matters

ASTM C867 matters because consistent sulfate measurement can help reduce variation in clay evaluation and support more dependable procurement and production decisions. A standardized test method makes it easier to compare results between laboratories, confirm compliance with internal requirements, and document material performance. In ceramic applications, that consistency can be important for quality control and risk reduction, especially when whiteware clay properties must be monitored closely. Using ASTM C867 helps align testing practices with an accepted ASTM standard.

• Soluble sulfate measurement
• Photometric test method
• Ceramic whiteware clay analysis
• Laboratory quality control
• Repeatable results for material evaluation