ASTM E1348

ASTM E1348 is the standard test method for transmittance and color by spectrophotometry using hemispherical geometry. It provides a structured way to measure how a specimen transmits light and how that transmitted light is characterized in color terms. This matters when consistent optical evaluation is needed for product comparison, quality control, or specification compliance. By using a defined spectrophotometric approach, ASTM E1348 helps improve repeatability and supports more reliable reporting of appearance-related properties.

Overview of ASTM E1348

The ASTM E1348 standard focuses on a spectrophotometric test method that uses hemispherical geometry to evaluate both transmittance and color. In practical terms, it gives users a controlled framework for assessing how light passes through a material and how that transmission affects measured color values. The designation is especially useful for organizations that need a consistent technical document for optical testing, comparison of results, and communication between suppliers, labs, and purchasers. ASTM E1348 supports standardized measurement practice rather than subjective visual judgment.

Common use cases of ASTM E1348

This standard is commonly used in laboratory and production settings where transmitted color and light behavior need to be measured in a repeatable way. It may be applied during material qualification, incoming inspection, product development, or routine quality control for transparent or translucent materials and related specimens. ASTM E1348 is also relevant when test reports must support purchasing decisions, product matching, or compliance with internal specifications that depend on spectrophotometric transmittance and color data.

Benefits of using ASTM E1348

Using ASTM E1348 helps create consistency in how transmittance and color are measured, which can reduce variation across testing locations or time periods. That consistency supports better comparisons between lots, suppliers, or finished products. It also strengthens documentation for compliance, procurement, and quality assurance programs by providing a recognized test method. For organizations evaluating optical performance, ASTM E1348 can help reduce uncertainty and improve confidence in reported measurement results.

• Hemispherical spectrophotometric measurement
• Transmittance and color evaluation
• Repeatable testing for quality control
• Useful for product comparison and reporting
• Supports standardized optical assessment