GB/T 46231.1-2025 Active National standards

GB/T 46231.1-2025 Plastics—General test method for polyurethane raw materials—Part 1:Determination of hydroxyl number of polyols by NIR spectroscopy

Publish Date: 2025-08-29 Implement Date: 2026-03-01 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 46231.1-2025

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: Thermosetting plastics

Publish Date: 2025-08-29

Implement Date: 2026-03-01

Pages: 40 pages

Scope

This document describes the method of determining the hydroxyl value of polyols using near-infrared spectroscopy. It provides relevant definitions and explanations of modeling techniques, establishes procedures for selecting calibration samples, collecting and processing data during the modeling process, and also sets out criteria for establishing, evaluating, and validating near-infrared models, as well as procedures for sample processing, data acquisition, and model evaluation.
This document is applicable to research, quality control, specific testing, and process control of polyols used in polyurethane production.