Material Test

1. Material test ---- Needle flame test
Based on standard IEC60695-11-5 fire hazard test part 11-5: needle flame test method, device, verification test agreement and guide，the needle flame test is suitable for insulation materials, engineering plastics or other solid combustible materials industry.
The needle flame test is based on the IEC60695 -11-5; GB/T5169.5-2008, GB4706.1-2005 and other standards used in the small flame ignition source simulation test project. Needle flame test is to use apparatus with specified size (diameter 0.9mm) needle burner, with specific gas (butane), with 45 degree angle orientation application sample as the sample gas, to test the ignition and the burning time and burning length to evaluate the small flame equipment caused by internal fault conditions of the fire danger. Needle flame test applies to lighting, low-voltage electrical appliances, household appliances, electrical tools, electric motor, electric tools, electronic instruments, electrical instruments, electrical connector such as electrical and electronic equipment and parts, components of the research, production and quality inspection departments, and can also be applied to insulation materials, engineering plastics or other solid combustible materials industry.

2.  Material test ---- Glow wire test
According to the standard IEC60695-2-11 , fire hazard test -- part 2-11 -- test method based on glow wire / heating wire -- glow wire flammability test of final product.
The device is designed according to the requirements of the IEC60695-2-10:2000, GB/T5169.10-2006, GB/T5169.13-2006 and GB4706.1 in the standard "glow wire test method" , applicable to electrical and electronic products, household appliances and materials for fire hazard testing, heat source or sources of ignition burning or overload resistance simulation components such as caused by thermal stress in a short time.
The glow wire tester is to simulate insulating material or other solid combustible material, which is easy to spread flame inside the equipment, and may be ignited by hot wire or burning element. Under certain conditions, such as fault current passing through the conductor, overload of components and loose contact, some components will reach a certain temperature and make the parts near the ignition test.
The working principle of glow wire test instrument: 4 mm nichrome wire (U type glow wire head) heated to the specified temperature (300 ℃ to 1000 ℃) with high current heat , under required pressure (1.0N) level, burn the subject 30s, test it whether ignite or hold burning time of fire to judge the flammability hazard of electrical and electronic equipment products; after completion of the burning test, record the ignition time (Ti), the fire extinguishing time (Te), and flammability index (GWFI).
Glow wire head: nominal diameter for armored thermocouple wire for 0.5mm, nickel chromium and nickel aluminum (K) wire, suitable for continuous operation at temperatures up to 960℃, the welding point in their armored sleeve for thermocouple measurement glow wire temperature, its armor the metal can stand at least 1050 ℃.
Calibrate glow wire temperature:
1. put the standard silver foil (99.8% purity and thickness of 0.06mm, the side of 2mm Square) on the top of the center of glow wire head.
2. glow wire head is heated to a suitable value until the silver foil melts, and value thermometer displayed should be the standards of 960 ±15℃.
（Note: the metal of its armoured sleeve of thermocouple should at least bear 1050 degrees of temperature. Imported thermocouple is recommended.）

3. Material test ---- Ball pressure test

According to standard IEC60695-10-2 "fire hazard test Part 10-2: thermal anomaly ball pressure test method", the structural characteristics of the nonmetal and insulating materials are subject to change under the effect of high temperature. This change is usually manifested in forms of softening or melting. The ball pressure test is used to test the heat-resistant properties of nonmetallic materials and insulating materials. In the standards of GB2099.1.1996, GB19212.1.2003, GB4943. 2001 and GB15092.1-2000, there is a clear requirement for the heat resistance of the metallic material and the insulating material, and pressure test is essential.

The sample is placed in a horizontal position and the 5mm diameter steel ball is pressed on the surface of the sample with 20N pressure. This test should be carried out in the heating box and the temperature is 75 ℃ ± 2 ℃. The diameter of the indentation was measured   1 hours after the action of the steel ball. The test fails when the diameter of the indentation is larger than 2mm.