GB/T 40872-2021 in English

VALID

Plastics—Test methods of polyethylene cellular

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

Price(USD)： $280.00
$272.00

Standard No:	GB/T 40872-2021
Document status:	VALID
Title in English:	Plastics—Test methods of polyethylene cellular
Title in Chinese:	塑料聚乙烯泡沫试验方法
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:	83.100-Cellular materials
Professional Classification:	GB-National Standard
Related Keywords:	plastics test methods typical test methods compression key performance test methods technical basis compression stress test add permanent deformation test
Related Topics:	foam tester foam tester Foam Box Acceptance Polyurethane, polystyrene, polyethylene foam production safety technical regulations Bubble foam test Foam production safety Polyethylene foam production safety technical regulations Vinyl Test Methods Styrofoam Gold Condition Method for checking ethylene foam replication GBT40872 GB/T 40872-2021 How to make ethylene foam and rubber polyethylene foam Blue bubble recipe and preparation method Foam box incoming inspection method Insulating agent plastic polystyrene foam Polyethylene thermal aging test method Ethylene enrichment method Foam mechanics testing Specification requirements for railway polyethylene foam plastic panels Test method for resistance of plastics to seawater immersion Food foam gasket exhaust method Polyethylene processing methods Geofoam Acceptance standards for polyethylene plastic bags Extruded polystyrene foam board technology Determination of melt index of polyethylene foam How to synthesize ethylene in the laboratory Polyethylene barrel drop test method Plastic Soak Test

《GB/T 40872-2021塑料聚乙烯泡沫试验方法》由TC15（全国塑料标准化技术委员会）归口，TC15SC4（全国塑料标准化技术委员会通用方法和产品分会）执行，主管部门为中国石油和化学工业联合会。

Introduction

Analysis of the core content of the standard

GB/T 40872-2021 specifies 12 key performance test methods for polyethylene foam plastics, including:

Basic properties: apparent density (7.1), dimensional measurement (Chapter 6)
Mechanical properties: compressive stress (7.2), tensile strength (7.4), tear strength (8.6)
Durability: compression set (7.3), repeated compression set rate (8.7)
Special properties: combustion characteristics (7.7), thermal conductivity (8.3)

Comparison of key technical differences

Test items	Improvements in GB/T 40872	Technical basis
Compression stress test	Add 100±10Pa prestress	Solve the problem of measuring the initial thickness of foam materials
Combustion characteristics	Only retain the horizontal combustion method	In line with the domestic testing system
New items	Shore hardness test (7.8)	Actual needs of the industry

Detailed explanation of typical test methods

Compression permanent deformation test (Chapter 7.3)

Adopt GB/T 6669 standard method, key parameters:

Compression: 25±2% of initial thickness
Holding time: 22 hours
Recovery measurement points: 30 minutes and 24 hours after unloading

Application case: Automobile seat foam needs to meet the deformation rate ≤15% after 24 hours of recovery

Standard implementation suggestions

Manufacturers should establish a three-level laboratory system: raw material entry inspection, process control, and finished product testing
Focus on safety indicators such as compression performance and combustion characteristics
For anisotropic materials, samples should be taken and tested in different directions

More samples: QC/T 942-2021 YD/T 3934-2021 GB 18306-2015

Sample only — not a preview of GB/T 40872-2021

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