ASTM C978
Standard Test Method for Photoelastic Determination of Residual Stress in a Transparent Glass Matrix Using a Polarizing Microscope and Optical Retardation Compensation Procedures
Available Formats:
Availability: Immediate Download
Language: English
License Type: Single User
Updates: Not Included
About This Item
ASTM C978 is the ASTM standard for photoelastic determination of residual stress in a transparent glass matrix using a polarizing microscope and optical retardation compensation procedures. It provides a technical framework for examining internal stress patterns in glass-based materials by combining polarized light observation with retardation measurement. This makes it useful when consistent stress evaluation is needed for quality control, product assessment, or engineering review of transparent glass materials.
Purpose of ASTM C978
The purpose of ASTM C978 is to define a standardized test method for observing and interpreting residual stress in a transparent glass matrix through photoelastic techniques. By pairing a polarizing microscope with optical retardation compensation procedures, the method supports more consistent stress determination across tests and users. The standard is intended to guide technical evaluation where internal stress conditions in glass may affect performance, reliability, or acceptance decisions.
Common use cases of ASTM C978
This standard is commonly used in laboratory and quality assurance workflows involving transparent glass materials where residual stress must be checked in a controlled way. ASTM C978 may support material characterization, comparative testing, or acceptance testing for glass products or glass-containing systems that rely on optical stress analysis. It is especially relevant when a polarizing microscope and retardation compensation methods are used to assess internal stress features in a repeatable manner.
Why ASTM C978 matters
ASTM C978 matters because residual stress in transparent glass can influence performance, durability, and product consistency. Using a recognized test method helps reduce variability in measurements and supports clearer communication between suppliers, laboratories, and purchasers. For procurement and compliance purposes, the standard provides a common technical reference for evaluating stress-related conditions, which can help lower uncertainty and improve confidence in test results and material decisions. ASTM C978 is therefore valuable in structured testing and quality control programs.
- Photoelastic residual stress evaluation
- Polarizing microscope-based inspection
- Optical retardation compensation procedures
- Transparent glass matrix testing
- Quality control and technical assessment
- Publication Date: 2025-07-31
- Publisher: ASTM
Need This Standard?
Request a personalized quote today to receive the latest edition in PDF or other available formats.
Need This Standard?
Request a personalized quote today to receive the latest edition in PDF or other available formats.
Summarize with AI
Get quick summaries using your favorite AI engine.
