ASTM C813 is the ASTM standard for Standard Test Method for Hydrophobic Contamination on Glass by Contact Angle Measurement. It provides a controlled way to evaluate whether a glass surface has unwanted hydrophobic contamination that can affect wetting behavior and surface performance. For manufacturers, laboratories, and quality teams, this test method can support more consistent inspection and better decisions about cleanliness, surface preparation, and product acceptance.

Overview of ASTM C813

This standard focuses on measuring contact angle as a practical indicator of hydrophobic contamination on glass. By examining how a liquid wets the surface, the method helps users assess whether the glass is behaving as expected or whether contamination may be present. ASTM C813 is especially relevant when surface condition matters to downstream processing, bonding, coating, or other applications where glass cleanliness can influence results and repeatability.

Common use cases of ASTM C813

ASTM C813 is commonly used in glass manufacturing, laboratory testing, and quality control settings where surface condition must be checked with a consistent test method. It may be applied during incoming inspection, after cleaning, or before additional surface treatment. The standard is also useful when evaluating glass for processes that depend on reliable wetting characteristics, helping teams identify whether hydrophobic contamination could interfere with performance or processing outcomes.

Benefits of using ASTM C813

Using ASTM C813 helps create a repeatable basis for evaluating glass surface condition and supports more defensible quality decisions. It can improve consistency across testing teams, reduce uncertainty in acceptance checks, and provide a common reference for procurement or compliance activities. For organizations managing glass products or processes, the method can also help reduce risk by identifying contamination concerns before they affect production, treatment, or final use. ASTM C813 is a practical tool for controlled surface evaluation.

• Contact angle-based contamination check
• Glass surface wetting assessment
• Quality control and acceptance support
• Useful for cleanliness verification workflows
• Helps compare surface condition consistently