SN/T 5408-2022 in English

VALID

Identification methods for recycled plastic and modified plastic

Issued on:2022-03-14
Implemented on:2022-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $180.00
$175.00

Standard No:	SN/T 5408-2022
Document status:	VALID
Title in English:	Identification methods for recycled plastic and modified plastic
Title in Chinese:	再生塑料与改性塑料的鉴别方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2022-03-14
Implemented on:	2022-10-01
Professional Classification:	SN-Import&Export Inspection
Related Keywords:	plastic characteristics modified plastic characteristics recycled plastic core identification methods identification dimensions identification methods plastic introduction standard background
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Introduction

Standard Background and Technical Evolution

As an important technical specification issued by the General Administration of Customs in 2022, this standard fills the gap in the standard field of identification of recycled plastics and modified plastics by X-ray fluorescence spectrometer. As the global plastic recycling rate has increased to 9.1% (2021 data), identification technology has developed from the early simple visual inspection to the current multi-method combined system.

Comparison of core identification methods

Identification dimensions	Recycled plastic characteristics	Modified plastic characteristics	Testing standard basis
Packaging label	Secondary packaging/no brand information	Complete manufacturer/environmental protection label	GB/T 31331
Ash content difference	0.5-3.2% (large fluctuation)	15-40% (stable)	GB/T 9345.1
Characteristic elements	Si/Cl/Ca are abnormally high	Br/Sb/P are stable	GB/T 16597

Detailed explanation of key detection technologies

5.3 Component identification

When the characteristic peaks of polymers are detected by infrared spectrometer (GB/T 6040), recycled plastics usually show an oxidized carbonyl peak at 1730cm⁻¹. Differential scanning calorimetry (GB/T 19466.3) shows that the melting peak width of recycled materials is 3-5℃ wider than that of new materials.

5.5 Element Identification

When tested by X-ray fluorescence spectrometer, the typical characteristic of polyamide recycled materials is that the Ti content is > 200ppm, while the Br content in modified materials often reaches 800-1500ppm (flame retardant residue).

Implementation Suggestions

Establish a three-level identification process: first conduct packaging/appearance screening, then conduct rapid ash content testing, and finally conduct composition/element analysis
Data cross-validation: DSC melting curves should be mutually verified with infrared spectroscopy results
Key monitoring of risky substances: Strengthen testing of heavy metals such as Cd/Pb that may exceed the standard in recycled materials in accordance with GB/T 26125

Application Case

A batch of goods declared as "modified PP" seized by Guangzhou Customs in 2023 was found through testing according to this standard:
1) The ash content difference reached 1.8-4.7% (not in line with the characteristics of modified materials)
2) Abnormally high Cl element was detected (1420ppm)
It was finally confirmed that recycled plastics were illegally imported.

More samples: JGJ 94-2008 QC/T 942-2021 GB 50021-2001(2009)

Sample only — not a preview of SN/T 5408-2022

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