GB/T 46828.2-2025 Active National standards

GB/T 46828.2-2025 Plastics—Determination of the total luminous transmittance of transparent materials—Part 2:Double-beam instrument

Publish Date: 2025-12-02 Implement Date: 2026-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 46828.2-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for synthetic resins and plastics

ICS Name: Plastic Composite

Publish Date: 2025-12-02

Implement Date: 2026-07-01

Pages: 12 pages

Scope

This document describes a method for measuring the total transmittance of nearly colorless flat transparent plastics in the visible spectral range using a double-beam photometer under specified CIE (International Commission on Illumination) standard light sources and photoelectric detectors.
This document is applicable to transparent molded materials, films, and sheets with a thickness not exceeding 10 mm. It is not applicable to plastics containing fluorescent materials.
Note 1: The total transmittance can also be measured using a single-beam photometer in accordance with GB/T 46828.1.
Note 2: Nearly colorless plastics include plastics with very light colors.
Note 3: If the instrument can test samples with a thickness exceeding 10 mm, the results will not be comparable to those obtained for samples with a thickness less than 10 mm.