Standard No.:	GB/T 45245-2025
English Name:	Determination method of total organic carbon in wood-based panels and finishing products
Chinese Name:	人造板及其制品中总有机碳的测定方法
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-02-28
Implemented on:	2025-6-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	9000 words
Translation Price(USD):	270.0
Delivery:	via email in 1~3 business day

GB/T 45245-2025 Determination method of total organic carbon in wood-based panels and finishing products 1 Scope This document describes a determination method for the total organic carbon (TOC) in wood-based panels and finishing products by non-dispersive infrared (NDIR) absorption spectrometry, involving reagents, apparatus, specimen preparation, determination procedure, data processing and result presentation, and reporting. This document applies to the determination of total organic carbon in wood-based panels and finishing products. This document is not applicable to the determination of total organic carbon in wood-based panels and finishing products containing carbonate minerals as the main primary additive. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 18259-2018 Terminology for wood-based panels and their surface decoration GB/T 36055-2018 Method for analysis of forestry biomass - Determination of moisture content 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 18259-2018 and the following apply. 3.1 wood-based panel panel or formed product composed of material units mainly made from wood or non-wood plant fibers, with or without adhesive and any other additive applied Note: Mainly including plywood, particleboard, and fiberboard. [Source: GB/T 18259-2018, 2.1] 3.2 total carbon total content of elemental carbon in a wood-based panel and finishing product Note: Including organic carbon content and inorganic carbon content. 3.3 total organic carbon total content of elemental carbon existing in organic form in a wood-based panel and finishing product 3.4 total inorganic carbon total content of elemental carbon existing in inorganic form in a wood-based panel and finishing product Note: Including elemental carbon in the form of carbonate or bicarbonate. 4 Method description A proper amount of specimen of a wood-based panel and finishing product is oxidized into carbon dioxide gas under high-temperature oxygen-rich conditions. The gas is introduced into a non-dispersive infrared detector for it to measure the infrared absorption spectrum intensity. The total carbon is quantitatively measured by external standard method. In the wood-based panel and finishing product, when the total inorganic carbon is below the allowable error in the total carbon measurement result, the total organic carbon is represented as the total carbon.

Contents Foreword III 1 Scope 2 Normative references 3 Terms and definitions 4 Method description 5 Reagents 6 Apparatus 7 Specimen preparation 8 Determination procedure 9 Data processing and result representation 10 Report Annex A (Informative) Reference values of total inorganic carbon in typical wood-based panels and finishing products