ASTM D8031

ASTM D8031 is the ASTM standard for determining the acid number of terephthalic acid (TA) by automatic potentiometric titration. It provides a structured test method for measuring acidity in this material, helping users obtain consistent results for quality control, specification checking, and lot-to-lot comparison. As a defined technical document, it supports more reliable testing practices where accurate acid number data may influence material acceptance and process decisions.

ASTM D8031 standard overview

The ASTM D8031 standard focuses on a laboratory test method for terephthalic acid using automatic potentiometric titration. Its purpose is to guide how the acid number is measured in a repeatable way, with attention to the test approach rather than product formulation. This makes the standard useful for organizations that need a common reference for analytical testing, data comparability, and standardized reporting. ASTM D8031 is particularly relevant when consistent measurement conditions are important for evaluating material quality.

Where is ASTM D8031 used?

This standard is commonly used in laboratories and quality control settings that handle terephthalic acid testing. It may support routine analysis in production, incoming inspection, and technical review workflows where acid number must be measured using automatic potentiometric titration equipment. ASTM D8031 is also useful for teams that need a recognized test method for documentation, internal specifications, or supplier verification. Its value is strongest in settings where repeatable analytical results are needed for the same material type.

Practical importance of ASTM D8031

In practice, this standard helps reduce variation in acid number testing by providing a clear and repeatable method. That can improve consistency across laboratories, support procurement and acceptance decisions, and strengthen quality control records. For organizations working with terephthalic acid, ASTM D8031 offers a common basis for comparing results and evaluating whether material meets expected requirements. It may also help lower testing risk by aligning measurement practice with an established ASTM method.

• Acid number testing for terephthalic acid
• Automatic potentiometric titration method
• Quality control and lot comparison
• Laboratory and specification use