ASTM E179
Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
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- Language: English
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About This Item
ASTM E179 is a practical guide for selecting geometric conditions used to measure the reflection and transmission properties of materials. It helps users choose measurement setups that fit the material and the purpose of the evaluation, supporting more consistent and meaningful results. As an ASTM standard, it is especially useful when reflection or transmission data must be compared, documented, or used in quality-focused workflows where measurement geometry can affect the outcome.
Purpose of ASTM E179
The purpose of ASTM E179 is to guide users in choosing geometric conditions for optical measurements involving reflected and transmitted light. The standard focuses on the measurement setup rather than the material itself, helping ensure that the selected geometry is appropriate for the property being evaluated. This is important because reflection and transmission results may change depending on angle, illumination, and viewing conditions. ASTM E179 provides a technical basis for making those choices more consistently.
Common use cases of ASTM E179
ASTM E179 is commonly used when specifying how to measure the reflection or transmission behavior of materials in a controlled way. It may support product development, laboratory testing, comparison of sample sets, or incoming and outgoing quality checks. The guide is relevant wherever geometric conditions influence reported optical results, such as in evaluating sheets, coatings, films, or other materials where reflectance and transmittance are important performance characteristics.
Why ASTM E179 matters
ASTM E179 matters because measurement geometry can strongly affect the values obtained for reflection and transmission properties. Using a recognized guide helps improve consistency across testing, reduce ambiguity in procurement or specification work, and support more reliable comparison between materials or suppliers. For organizations that depend on optical property data, ASTM E179 can also help reduce risk by aligning test setup decisions with a documented ASTM standard.
- Guidance for selecting measurement geometry
- Supports reflection and transmission testing
- Helps improve consistency and comparability
- Useful for specification and quality control work
- Publication Date: 2022-11-04
- Publisher: ASTM
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