MaTestLab > Test Standards > ASTM D2457 Standard Test Method for Specular Gloss of Plastic Films and Solid Plastics
ASTM D2457 Standard Test Method for Specular Gloss of Plastic Films and Solid Plastics
ASTM D2457 evaluates the material's capacity for mirror-like light reflection and offers a quantitative glossiness value, assisting in quality control and product characterization. Specular gloss is primarily a measure of the shiny appearance of films and surfaces. Gloss is a complex attribute of a surface which is difficult to be completely measured by any single number and precise comparisons of gloss values of two different materials are meaningful only when they refer to the same measurement procedure, followed in a testing lab, and similar material. ASTM D2457 test method describes procedures for the measurement of gloss of plastic films and solid plastics, both opaque and transparent.
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Introduction to ASTM D2457
ASTM D2457 test method is used to determine specular gloss of plastic films and solid plastic materials. Specular gloss usually varies with surface smoothness and flatness. It is sometimes used for comparative measurements of these surface properties. However, gloss values for transparent films should not be compared with those for opaque films, and vice versa. ASTM D2457 test method describes procedures for the measurement of gloss of plastic films and solid plastics, both opaque and transparent. It contains five separate gloss angles: (a) 60-deg, recommended for intermediate-gloss films, (b) 20-deg, recommended for high-gloss films, (c) 45-deg, recommended for intermediate and low-gloss films, (d) 85-deg, recommended for intermediate and low gloss films, and (e) 75-deg, recommended for plastic siding and soffit.
By quantifying glossiness through the ASTM D2457 test method, manufacturers, researchers, and quality control personnel can assess the surface finish and reflective properties of plastic materials, ensuring compliance with industry requirements and enhancing product quality.
ASTM D2457 Test Procedure
Specimen Selection
A clean plastic film or solid specimen is essential for accurate gloss measurement. It has a smooth, flat surface and is sufficiently thick for transparent or translucent materials to prevent significant light transmission during testing.
Test Setup and Execution
A gloss meter measures specular gloss by placing a plastic specimen on a stable surface, adjusting the angle (60 degrees), and measuring light reflection. The gloss value should be accurately and repeatably measured following ASTM D2457 standard instructions for repeatable results.
ASTM D2457 Test Specimens
Specimen Details
A representative specimen of the evaluated plastic film or solid product should be free from defects, debris, or surface irregularities affecting gloss measurement.
Specimen Dimensions
The specimen size depends on the gloss meter’s measuring area, with some using a standard 2 inches by 2 inches (50.8 mm by 50.8 mm) specimen. Transparent or translucent materials may require a minimum thickness to prevent light transmission during measurement.
ASTM D2457 Test Results
The ASTM D2457 test measures specular gloss in plastic films and solid plastics, indicating the material’s glossiness. Results are expressed in gloss units (GU) or gloss index. A gloss meter measures light reflected from the specimen at a specific angle, with higher gloss values indicating shinier and more reflective material. Lower values indicate a less shiny or matte appearance.
Tests Related to ASTM D2457Important tests relevant to ASTM D2457 include ASTM D523 (Standard Test Method for Specular Gloss), ASTM D2486 (Standard Test Methods for Scrub Resistance of Wall Paints), and ASTM E430 (Standard Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry).
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