Understanding the GB5725 standard safety net flame retardant tester in one article

As a "life barrier" for high-altitude operations and building protection, the flame retardant performance of safety nets directly affects the safety of personnel evacuation in fire scenarios. The GB5725 "Safety Net" standard is the main basis for testing and determining the flame retardant performance of safety nets, and the development and application of safety net flame retardant testers must also strictly comply with this standard requirement.

1、 Core requirements for flame retardant performance in GB5725 standard

Burning time control: The standard clearly stipulates that under specific ignition conditions, the ignition time of the safety net sample must be ≤ 4s, and the smoldering time must be ≤ 4s, in order to fundamentally limit the possibility of continuous flame spread.

Limitation on the length of combustion damage: After the sample is burned, its maximum damage length must be ≤ 250mm to ensure that even if the safety net burns locally in a fire, it can still retain most of the structural strength and buy time for escape.

Requirement for no melt dripping: For safety nets made of some synthetic fiber materials, the standard strictly prohibits the occurrence of melt dripping during the combustion process to avoid secondary fires or burns caused by high-temperature dripping.

2、 How to match the standard testing process with the safety net flame retardant tester

Simulated ignition environment: The tester is equipped with a standard ignition source, which can control the flame height and ignition time, and restore the ignition scene in the early stage of a real fire.

Collecting key data: Through the built-in timing device and length measurement component, the tester can automatically record the duration of combustion and smoldering, carefully measure the length of combustion damage, and avoid manual operation errors.

Safety protection and environmental protection design: The tester is equipped with a closed combustion chamber and exhaust gas treatment system, which not only prevents flame overflow during the testing process, but also can treat harmful gases generated by combustion, meeting laboratory safety and environmental protection requirements.

The existence of the safety net flame retardant tester transforms the "paper requirements" of GB5725 standard into quantifiable and verifiable actual performance data. Only by selecting testing instruments that meet the standards can enterprises ensure that their production safety nets truly have fire protection capabilities and build a solid defense line for the safety of high-altitude operations.

According to the standard, whether the material has reached the flame retardant level is determined. Beijing Xinsheng Zhuorui Technology Co., Ltd. and Beijing Xunyu Technology Co., Ltd. have developed and produced the GB5725 safety net flame retardant performance tester with a fully automatic touch screen model. The GB5725 touch screen controlled safety net combustion performance (flame retardant) tester, also known as the textile vertical combustion tester, is suitable for measuring the combustion (flame retardant) performance of various safety flat net vertical nets with dense mesh. The GB5725 touch screen controlled safety net combustion performance (flame retardant) tester shall be tested according to the method specified in 6.1.6 of section 5.1.12 of GB5725 safety net for flame retardant performance and flame retardant flat (vertical) net. The duration of continuous combustion and smoldering should not exceed 4 seconds. According to the flame retardant performance of 5.2.2.9, the flame retardant performance of the dense mesh safety net shall be tested according to the testing method specified in 6.2.12. The continuous burning and smoldering time in the horizontal and central directions shall not exceed 4 seconds. The testing requirement is to randomly take five ropes with a length of 300 ± 5mm from the sample net, and test them according to the method specified in GB5455, with the results rounded to one decimal place.