GB/T 40909-2021 in English

VALID

Textiles—Determination of methylcyclosiloxane residues

Issued on:2021-10-11
Implemented on:2022-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $180.00
$175.00

Standard No:	GB/T 40909-2021
Document status:	VALID
Title in English:	Textiles—Determination of methylcyclosiloxane residues
Title in Chinese:	纺织品甲基环硅氧烷残留量的测定
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-10-11
Implemented on:	2022-05-01
ICS Classification:	59.080.01-Textiles in general
Chinese Classification:	W04-Basic standards and general methods
Professional Classification:	GB-National Standard
Related Keywords:	methylcyclosiloxane residues introduction technical background cyclosiloxane residues textiles determination excessive d5 residues standard method
Related Topics:	Silicone Silsesquioxane Set of siloxane copper siloxane Textile A methyl Methylsiloxane Silicone test Fluorocyclosiloxane Determination of Residual Ethylene Oxide by Gas Phase Silicon peak Ethylene Oxide Residual Chromatography Silicone test Copper siloxane Siloxane Peak Silanized residue Silanized residue methyl peak next to oxygen Solvent for Methoxyl Determination Alkane + methane anaerobic Siloxane content test alkyl Silica Silica Silicon methyl peak Cyclosiloxane oxygen pool methane Alkoxy content Determination method for methane determination Siloxane Silane residue methane ozone layer ethylene oxide residual UV Fluorocyclosiloxane Silicon peak Epoxy residue GBT40909 GB/T 40909-2021 Methylsilylation derivatization of sterols Ethylene oxide residue detection standards silicone silicone Ethylene oxide residual detection Cultural relics ethylene oxide residue Dimethylsiloxane molecular weight detection Ethylene oxide residue testing United States Determination method of silica in textiles Residual amounts of ethylene oxide in pharmaceutical excipients Ethylene oxide remains in food and drugs Food ethylene oxide residue detection Ethylene oxide residual detection execution Silane testing standards Silane entry testing standards Residual amount of ethylene oxide in catheter products What are the methods for measuring dimethylsiloxane? Determination method of dimethoxymethane Methane full range

《GB/T 40909-2021纺织品甲基环硅氧烷残留量的测定》由TC209（全国纺织品标准化技术委员会）归口，TC209SC1（全国纺织品标准化技术委员会基础标准分会）执行，主管部门为中国纺织工业联合会。

Introduction

Technical Background of the Standard

With the widespread application of organosilicon materials in textile auxiliaries, the problem of methylcyclosiloxane (D4/D5/D6) residues has attracted increasing international attention. As my country's first standard specifically for the detection of cyclosiloxane residues in textiles, this standard fills the technical gap in risk assessment of textile chemicals.

Method principle and technological innovation

Technical elements	Samples without coating	Samples with coating
Extraction solvent	n-hexane	Tetrahydrofuran+n-hexane
Temperature control	30±2℃	60±5℃→30±2℃
Processing time	20±2min	60±5min→20±2min

Typical case: A knitted product for export was notified by the EU for excessive D5 residues. The source was traced using this standard method and it was found to be caused by improper process control of silicone softener. The residual amount was reduced from 58.2mg/kg to 3.5mg/kg by optimizing the washing process.

Key instrument configuration requirements

The core equipment Gas chromatography-mass spectrometry must meet the following requirements:

Chromatographic column: TG5SilMS (30m×0.25mm×0.25μm)
Ion source temperature: 250℃
Scan mode: automatic switching between full scan (50-450m/z) and SIM mode

Implementation difficulties and solutions

Interference control:The laboratory needs to pay special attention to the background contamination that may be introduced by plastic utensils, silicone gaskets, etc. It is recommended that:

Use glass extraction bottles
The blank test value is strictly controlled below 0.05mg/L
Operators should avoid using silicone-containing skin care products

Method Validation Data

Parameters	D4	D5	D6
Limit of Quantitation	10.0mg/kg
Precision	±8.2%	±7.6%	±9.1%
Recovery	92-105%	94-108%	89-103%

Suggestions on the application of the standard

It is recommended that textile enterprises establish a three-level control system:

Raw material screening:Conduct factory inspection on silicone softeners
Process monitoring:Increase rapid screening after the finalization process
Finished product verification:Conduct compliance testing according to this standard

More samples: JGJ 94-2008 DL/T 368-2010 QC/T 942-2021

Sample only — not a preview of GB/T 40909-2021

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