Horizontal and veruical burnlng tester is malnly used for plastic or fim under the speciied fre source direct bumina to measure thefre-resistant perormance of plastics, and determine its fire-resistant level. UL 94 is one of the most important test methods and standardsrelated to UL about fire safety. it is very important for plastics used in electrical industry, The test method is made based on the research olUL to plastic flame-resistant performance, which is not only applicable to the electrical industry, and many other areas, such as lightingeguipment, low-voltage appliances, household appliances, electrical machines, tools, instruments these equipment, and electricalconnections and other electrical and electronic products and component pats, their research, production, and quality control departmentsbut also for insulating materials, engineering materials and other solid combustible materials industry.
1.2 Related standards

