GB/T 40237-2021 in English
VALIDTest method for ignitability of foamed plastic—Welding spark method
- Issued on:2021-05-21
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 40237-2021泡沫塑料着火性试验方法 电焊火花法》由TC113（全国消防标准化技术委员会）归口，TC113SC7（全国消防标准化技术委员会防火材料分会）执行，主管部门为应急管理部。
Introduction
Interpretation of the core content of the standard
This standard establishes for the first time an evaluation method for the ignition properties of foam plastics in an electric welding environment, and fills the gap in traditional ignition source testing by simulating the electric welding spark impact scene generated by a carbon dioxide shielded welder.
Test principle and technical features
A 45° angle welding gun is used with a 10-15mm arc starting distance to ensure uniform distribution of spark particles. The key parameters include:
| Parameters | Technical requirements | Allowance deviation |
|---|---|---|
| Specimen size | 600×600×50mm | ±5mm(length and width),±2mm(thickness) |
| Spark impact distance | 600mm | ±50mm |
| Low carbon steel plate speed | 5-10mm/s | Servo motor control |
Key equipment requirements
Electric welding spark test device must meet the following requirements:
- The combustion box adopts a 800×800×1000mm stainless steel structure
- The welding wire uses ER50 type 1.0mm carbon steel welding wire (in line with GB/T8110)
- The micro-motor system controls the Z-shaped scanning trajectory
Comparative analysis of judgment criteria
| Failure mode | Judgment threshold | Test observation items |
|---|---|---|
| Flame combustion | ≥5s | Flame height, duration |
| Smoldering | ≥30 seconds | Smoke location and expansion |
| Ignition of molten droplets | Ignition of absorbent cotton | Droplet size and frequency |
Implementation suggestions
Polyurethane foam case: It is recommended to maintain an environment of 23±2℃/50±10%RH for 88 hours during the pretreatment stage, and pay attention to the molten droplet phenomenon during the test.
Safety protection focus: It is necessary to configure dual protection of welding mask + respiratory protection, and monitor for 24 hours after the test to prevent re-ignition.
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 21372-2024 in English
Portland cement clinker
2024-03-15 -
GB/T 38530-2020 in English
Town liquefied natural gas (LNG) gasification supply installations
2020-03-06 -
GB/T 14299-2007 in English
Spiral flute drill with indexable inserts
1993-04-17 -
GB 23200.1-2016 in English
National food safety standard―Determination of acetanilide herbicide residues in cereals and oil seeds Gas chromatography-mass spectrometry
2016-12-18 -
GB 50560-2010 in English
Code for design of building and sanitary ceramic plant
2010-05-31 -
GB 50857-2013 in English
Standard method of measurement for public utilities works
2012-12-25 -
GB/T 16745-1997 in English
standard test method for solderability of metallic-coated products
1997-03-04 -
GB/T 244-1982 in English
Method for bend test on tubes of metals
- -
GB/T 32061-2015 in English
Testing method of laminated glass interlayer shear modulus
2015-10-09 -
.png "GB 50016-2014(2018) in English")
GB 50016-2014(2018) in English
Code for Fire Protection Design of Buildings - Partial Revision -2018
2018-03-30
