ASTM C1350M
Standard Test Method for Measurement of Viscosity of Glass Between Softening Point and Annealing Range (Approximately 108 Pa·s to Approximately 1013 Pa·s) by Beam Bending (Metric)
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Language: English
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About This Item
ASTM C1350M is the standard test method for measuring the viscosity of glass between the softening point and annealing range using beam bending in metric units. It helps define how glass behaves in a critical thermal interval where viscosity changes can affect forming, processing, and quality results. For laboratories, manufacturers, and technical buyers, this ASTM standard provides a controlled approach to evaluating glass at approximately 108 Pa·s to 1013 Pa·s.
Overview of ASTM C1350M
This standard focuses on a specific viscosity measurement method for glass, using beam bending as the test principle. ASTM C1350M is intended for conditions between the softening point and the annealing range, where accurate viscosity data can support material characterization and process decisions. The metric designation indicates the test is presented in metric form, making it suitable for international technical use, laboratory documentation, and standardized comparison of glass behavior across similar evaluation programs.
Common use cases of ASTM C1350M
ASTM C1350M is commonly used when glass viscosity must be checked during thermal analysis, product development, or process verification. It is relevant for labs that evaluate glass samples in the viscosity range identified by the title and need a repeatable beam bending method. The standard may also support quality control, comparative testing, and technical review of glass intended for controlled heating, forming, or annealing-related applications.
Benefits of using ASTM C1350M
Using ASTM C1350M helps support consistent viscosity measurement with a recognized ASTM test method, which can improve confidence in test results and reduce ambiguity in reporting. It is useful for procurement, specification review, and compliance-based workflows where standardized glass testing is important. The method also supports better material comparison and risk reduction by giving laboratories a common reference for evaluating glass behavior in a defined thermal range.
- Beam bending viscosity measurement
- Glass testing between softening and annealing ranges
- Metric reporting format
- Laboratory consistency and comparison
- Quality control and technical evaluation
- Publication Date: 2025-07-21
- Publisher: ASTM
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