ASTM C690 is the ASTM standard for the particle size distribution of alumina or quartz powders by electrical sensing zone technique. It provides a structured test method for evaluating powder particle size, which is important when material consistency affects processing, product performance, or quality control. By defining a common testing approach, this standard helps buyers, producers, and laboratories compare results more reliably and support consistent specification of fine powders.

ASTM C690 standard overview

The ASTM C690 standard focuses on measuring particle size distribution in alumina or quartz powders using an electrical sensing zone technique. That makes it a technical test method rather than a product specification, and its main value is establishing a repeatable way to characterize powder samples. In practice, it supports standardized reporting of particle-size data so results can be reviewed, compared, and used with greater confidence in laboratory and manufacturing workflows.

Where is ASTM C690 used?

ASTM C690 is commonly used in settings that handle alumina or quartz powders and need controlled particle size data for testing or acceptance purposes. It is relevant in laboratories, quality control departments, and material evaluation workflows where powder characteristics may influence downstream use. The standard is especially useful when particle size distribution must be measured consistently with an electrical sensing zone instrument and documented in a way that supports internal review or supplier communication.

Practical importance of ASTM C690

In practice, ASTM C690 helps reduce uncertainty in powder evaluation by providing a recognized method for measuring particle size distribution. That supports compliance efforts, procurement decisions, and routine quality control when alumina or quartz powders must meet defined expectations. A consistent test method can also lower the risk of comparing results from different sources that use different approaches. For organizations working with these materials, the standard adds clarity to testing and product assessment.

• Particle size distribution measurement
• Electrical sensing zone technique
• Alumina powder testing
• Quartz powder testing
• Quality control and reporting