The hot wire test is used to test the stability of electronic and electrical products during operation. And the hot wire itself is actually a fixed specification resistance wire ring, which needs to be electrically heated during testing
At the specified temperature, allow the top of the hot wire to contact the sample for the standard required time, and then observe and measure its state. The testing range depends on the specific test procedure.
For example, for the household appliance industry, safety has always been a highly concerned issue. Due to misoperation, the electrical wiring system may experience current overload or short circuit, leading to
Due to the combustion of plastic materials, the industry has established various fire prevention requirements to evaluate and determine the flammability level of materials used in electrical appliances. Glow Wire Testing
It is one of the relevant fire prevention requirements adopted in the current household appliance industry.
As a device for flame retardant performance of electrical products such as switches and sockets, the hot wire tester is an essential instrument for detecting the fire resistance characteristics of materials and finished products. The hot wire tester is based on
Designed and manufactured in accordance with the requirements of the "hot wire test method" in IEC60695-2-10, GB/T5169.10, GB/T5169.13, and GB4706.1 standards, applicable to electrical and electronic products
Conduct fire hazard tests on household appliances and their materials, simulating the thermal stress caused by heat sources or ignition sources such as burning elements or overload resistors in a short period of time. The hot wire testing machine is composed of
The control unit consists of a true color LCD touch screen, calibration button, heating button, start button, ignition button, reset button, exhaust fan, and lighting button
The test box consists of a thermocouple, a U-shaped hot wire head, a sample trolley, a pressure method code, a roller, a limit mechanism, a positioning mechanism, a metal wire method code dragging trolley, and an exhaust hole.
The main function of the hot wire tester.
1. Determination of flammability index GWFI.
If the test sample does not ignite or meets the following two conditions, it is considered to have withstood this test: a) If the flame of the test sample
If the heating wire extinguishes within 30 seconds after removing the heating wire, b) the packaging paper does not ignite. If either or both of the above conditions are not met, choose a lower test temperature and use
Repeat the experiment with a new sample. If both of the above conditions are met simultaneously, select a higher test temperature and repeat the test with a new test sample. Should be tested on the sample
Repeat the experiment at the high test temperature that meets conditions a) and b). To determine the high test temperature at GWFI that meets conditions a) and b) for three consecutive tests
2. Determination of ignition temperature GWIT.
The evaluation of the ignition temperature (GWIT) of the hot wire should determine the ignition temperature of the test sample during the application of the hot wire, which will be higher than the ignition temperature of the test sample that did not cause ignition after three consecutive tests
The test temperature record for the high temperature at the top of the hot wire, which is 25K (30K between 900 ℃ and 960 ℃), is GWIT.
