GB/T 39699-2020 in English

VALID

Rubber. Identification of polymers. Pyrolytic gas-chromatographic method using mass-spectrometric detection

Issued on:2020-12-14
Implemented on:2021-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
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Standard No:	GB/T 39699-2020
Document status:	VALID
Title in English:	Rubber. Identification of polymers. Pyrolytic gas-chromatographic method using mass-spectrometric detection
Title in Chinese:	橡胶聚合物的鉴定裂解气相色谱-质谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-12-14
Implemented on:	2021-11-01
ICS Classification:	83.060-Rubber
Chinese Classification:	G40-Rubber products in general
Professional Classification:	GB-National Standard
Related Keywords:	rubber polymers butadiene characteristic peaks silicone rubber raw rubber unvulcanized rubber natural rubber
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Methods for analyzing mass spectra of benzene in air gb/t 39699-2020

《GB/T 39699-2020橡胶聚合物的鉴定裂解气相色谱-质谱法》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC2（全国橡胶与橡胶制品标准化技术委员会通用试验方法分会）执行，主管部门为中国石油和化学工业联合会。

Introduction

Interpretation of the core content of the standard

This standard is equivalent to the ISO17257:2020 international standard, which specifies the method of identifying rubber polymers by pyrolysis gas chromatography-mass spectrometry. It is applicable to the single or combined system analysis of raw rubber, vulcanized rubber and unvulcanized rubber, with a detection limit of 10% of the component content.

Technical Principles and Equipment Requirements

System Components	Technical Requirements	Typical Parameters
Pyrolysis System	Platinum Wire/Curie Point/Micro Furnace Pyrolyzer	400-800℃ (600℃ recommended)
Chromatographic Column	Non-polar/polar capillary column	30m×0.32mm, 1μm film thickness
Mass Spectrometer Detector	EI Ion Source	Scanning Range 29-500m/z

Rubber classification and identification characteristics

Typical polymer characteristic compounds

Natural rubber (NR): Isoprene (CAS78-79-5) and limonene isomers
Nitrile rubber (NBR): Acrylonitrile (CAS107-13-1) + butadiene characteristic peaks
Silicone rubber (PVMQ): Cyclosiloxane series + benzene characteristic peaks

Note: Polymer groups such as EPDM and EPM, NR and IR need to be determined in combination with multiple characteristic peaks

Key points for implementation of the standard

Sample pretreatment needs to be carried out according to ISO1407 for solvent extraction
Pyrolysis temperature stability control ≤±5℃
The mass spectrometry library must include a database of rubber characteristic compounds
Pay attention to copolymer interference when analyzing combined rubbers

Technology evolution analysis

This standard has major improvements over the previous version: Added identification method for fluororubber (FKM), improved the detection instructions for combined rubbers, and supplemented safety regulations such as warnings. The detection sensitivity is increased by 30% through mass spectrometry characteristic ion screening technology.

More samples: NB/T 47013.2-2015 QC/T 942-2021 JJG 21-2008

Sample only — not a preview of GB/T 39699-2020

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