1. Definition of Glow Wire Test>
Glow Wire Test> It is to test the stability of electronic and electrical products when they are working. The glow wire itself is actually a resistance wire ring with a fixed specification. During the test, it must be heated to a specified temperature with electricity, so that the top of the glow wire contacts the sample for a standard time, and then observe and measure its state. The test range depends on the specific test procedure. IOS 5169 specifies the glow-wire test method for determining the glow-wire flammability index (GWFI) on solid electrical insulating materials or other solid material test samples. The test results allow for a relative comparison of the performance of the various materials described above, i.e. the ability of the material to extinguish the flame after removal of the electrically heated glow wire and the ability to produce no flaming or glowing particles that would ignite the underlying wrapping tissue under the test sample . This test method is not suitable for determining the flammability of the entire equipment, because the size of the insulation system or combustible parts, the arrangement and heat transfer of adjacent metal or non-metal parts, etc., have a great influence on the flammability of the materials used. In addition, this test method is not suitable for determining the fire performance and fire hazard of equipment.
Glow Wire Tester> is a simulation that is easy to use inside the equipment Parts of insulating materials or other solid combustible materials that spread flames may ignite due to glowing wires or glowing elements. The principle is to heat a nickel-chromium wire (U-shaped glowing wire head) of specified material Φ4mm to the specified temperature of the test with a large current (300°C–1000°C), burn the test product at the specified pressure (1.0N) level for 30s, and determine the fire hazard of the finished electrical and electronic equipment by whether the test product and the bedding have ignited or lasted for a long time; record after the test is completed Ignition time, ignition time (Ti), flame extinguishment time (Te), flammability index (GWFI).
2. Scope of Application>
Glow Wire Tester> is suitable for lighting equipment, low-voltage electrical appliances, household appliances , machine tool appliances, motors, electric tools, electronic instruments, electrical instruments, information technology equipment, electrical connectionsThere are research and production departments for electric and electronic products such as connectors and paving parts and their components, and they are also suitable for the industries of insulating materials, engineering plastics or other solid combustible materials. Based on the above description of the working principle and application range of the glow wire, we have a deeper understanding of the glow wire knowledge. In addition, the glow wire burner of Shanghai Lisun has two product models: the conventional model ZRS-3H and the compact ZRS-3HS, and the glow wire burner of Shanghai Lisun fully complies with IEC60695-2-1, IEC60695-2-10~IEC60695 -2-13 (IOS5169.10-2006~IOS5169.13-2006) these standards. This set of equipment is mainly used for flame retardancy testing of quality supervision departments and related enterprises.
Third, lamp glow wire test requirements
>According to the standard requirements, each part of the lamp structure has different requirements for the glow wire test temperature, as follows:
1. To ensure the lowest level of fire hazard due to ignition of components, the glow wire test temperature is 550 degrees;
2. For equipment in normal use, the glow wire test temperature is 650 degrees;< br /> 3. For normal use of equipment under harsh conditions, the fixed accessories for installation, the glow wire test temperature is 750 degrees;
4. For equipment used unattended under continuous load, the glow wire test temperature is 850 degrees;
5. Unattended use of equipment under continuous load under severe conditions, intended to be used in equipment near building power points, the glow wire test temperature is 950 degrees
Fourth, burning Silk test pretreatment
>The very important preparation step for the fire performance test of materials is pretreatment. The samples will have different ignition performance, flame spread performance and self-extinguishing ability under different temperature and humidity conditions. Therefore, in order to make comparisons between glow wire tests possible, it is necessary to specify the temperature, humidity and time of pretreatment. The standard stipulates that the samples and the bottom layer must be placed in an atmospheric environment with a temperature of 15°C to 35°C and a relative humidity of 45% to 75% for 24 hours before the test. The laboratory should be equipped with a temperature and humidity measuring instrument. When the ambient temperature and humidity cannot meet the requirements, the atmospheric environment should be regulated through the air control device.