ASTM E1349
Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45°:0° or 0°:45°) Geometry
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About This Item
ASTM E1349 is a test method for determining reflectance factor and color by spectrophotometry using bidirectional 45°:0° or 0°:45° geometry. It provides a standardized way to measure how a surface reflects light and how that response translates into color values. This matters when consistent appearance data is needed for product approval, quality control, or comparison across samples, since measurement geometry can influence results and reproducibility.
ASTM E1349 standard overview
The ASTM E1349 standard focuses on spectrophotometric evaluation with a defined bidirectional geometry, helping users measure reflectance factor and color under controlled conditions. By specifying 45°:0° or 0°:45° measurement arrangements, it supports more consistent appearance testing and reduces ambiguity in color reporting. ASTM E1349 is commonly used as a technical reference when a product page, specification, or test program needs a clear method for comparing color and reflectance data.
Where is ASTM E1349 used?
This standard is generally used in laboratory and production settings where color and reflectance measurements must be repeatable and comparable. It is well suited to workflows involving spectrophotometers configured for bidirectional geometry and to materials or finishes where appearance evaluation is important. ASTM E1349 may be applied in incoming inspection, product development, or final verification when measured color data must align with a defined test method and support consistent decision-making.
Practical importance of ASTM E1349
Using ASTM E1349 helps organizations evaluate appearance with a common measurement approach, which can improve consistency across teams, suppliers, and test sites. The standard supports compliance activities, product comparisons, and quality control by reducing variation tied to measurement setup. For procurement and specification work, it also gives buyers and manufacturers a shared technical reference for reflectance factor and color testing, helping limit disputes and improve confidence in reported results.
- Bidirectional 45°:0° or 0°:45° geometry
- Reflectance factor measurement
- Color evaluation by spectrophotometry
- Consistent appearance testing
- Quality control and product comparison
- Publication Date: 2022-11-04
- Publisher: ASTM
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