ASTM C148 is the standard test methods document for polariscopic examination of glass containers, providing a technical basis for evaluating optical stress patterns in glassware. It is commonly used when consistent inspection of glass containers is needed for quality control, product assessment, and compliance-oriented testing. By focusing on a polariscopic examination approach, the standard helps users apply a repeatable method for identifying conditions that may affect container performance and reliability.

Purpose of ASTM C148

The purpose of ASTM C148 is to define test methods for examining glass containers with polariscopic techniques. In practical terms, it supports a controlled way to observe internal stress effects that may be present in formed glass containers. This is useful for manufacturers, inspectors, and laboratories that need a recognized ASTM standard for evaluating glass container condition. The standard helps create a common technical reference for inspection and comparison.

Common use cases of ASTM C148

ASTM C148 is commonly used in glass container manufacturing, incoming inspection, and laboratory testing workflows where polariscopic examination is part of quality evaluation. It may be applied to bottles, jars, and similar glass containers when users need to assess stress-related characteristics through an optical method. The standard is also relevant for technical review during production checks, troubleshooting, or supplier verification, especially where consistent examination practices are important.

Why ASTM C148 matters

ASTM C148 matters because a standardized test method supports more consistent inspection results across different operators, facilities, and procurement settings. For glass container users, that consistency can improve product evaluation, reduce uncertainty in quality control, and support better decision-making during acceptance testing. Using a recognized ASTM standard also helps align internal inspection practices with an established technical document, which can be valuable for documentation, compliance, and risk reduction.

• Polariscopic examination of glass containers
• Glass container quality control
• Optical stress inspection methods
• Testing and acceptance workflows
• Technical reference for consistent evaluation