ASTM E1331
Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry
Available Formats:
- Availability: Immediate Download
- Language: English
- License Type: Single User
- Updates: Not Included
- Availability: Request Quote
- Language: English
- License Type: Enterprise / Multi User
- Updates: Included
About This Item
ASTM E1331 is the ASTM standard that addresses reflectance factor and color measurement by spectrophotometry using hemispherical geometry. It is relevant when users need a consistent way to evaluate how a surface reflects light and how its color is measured under controlled conditions. As a technical document, it supports more repeatable results in testing and quality control, helping reduce variation when comparing materials, finishes, or products with color-critical requirements.
ASTM E1331 standard overview
The Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry defines a spectrophotometric approach for measuring optical properties with a hemispherical setup. This framework is intended to support consistent color and reflectance factor determinations, especially where controlled geometry matters. ASTM E1331 is commonly used as a reference for measurement practice, helping laboratories and production teams align on a repeatable test method for color-related evaluation and comparison.
Where is ASTM E1331 used?
This standard is typically used in laboratory and quality assurance settings where color and reflectance measurements must be made in a controlled, repeatable way. It is relevant for materials, surfaces, and finished products where optical appearance is important, such as coatings, plastics, papers, textiles, or other color-sensitive items. ASTM E1331 may also support instrument-based workflows that rely on spectrophotometry and hemispherical geometry for comparative testing or routine verification.
Practical importance of ASTM E1331
In practice, this standard helps improve consistency in color measurement and reflectance evaluation, which can support product acceptance decisions and reduce disagreements between suppliers and buyers. Using ASTM E1331 can make testing more traceable and easier to compare across batches, instruments, or locations. That is especially useful for procurement, specification checks, and quality control when appearance and optical performance are part of the requirements.
- Reflectance factor measurement
- Color evaluation by spectrophotometry
- Hemispherical geometry method
- Quality control and comparison testing
- Publication Date: 2023-11-21
- 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.
Online Standart Disclaimer
OnlineStandart.com is an authorized reseller of international standards, operating through partnerships with authorized distributors. We do not own the copyrights or trademarks of the standards we sell, including but not limited to those of API, ASHRAE, BSI, SAE, ASTM, IEEE, IEC, ASME, ISO, and others.
All product names, logos, and brands are the property of their respective owners and are used for identification purposes only; their use does not imply endorsement. OnlineStandart.com is not affiliated with or endorsed by any standards development organization unless explicitly stated. The content of this document is for informational purposes only and is intended to promote our licensed reselling services.
Online Standart does not host, distribute, or link to free, unlicensed, or uncertified copies of copyrighted standards. Every document we deliver is a licensed copy obtained through authorized channels and supplied with full licensing documentation. The “Free PDF Download” option on our product pages refers to this free informational document — never to a free copy of any standard.