1 , UL94-V2:
塑料阻燃等级由HB，V-2，V-1向V-0逐级递增：
UL94V0,V1,V2是不同的阻燃等级,其等级不同,耐燃的测试方法亦不同,测试判定的标准也不同.
V0的测试方法是将测试物倾斜45度,用酒精灯点燃,移开火源后,10秒内熄灭.
V1,V2的测试方法同V0一样,不同的是移开源后,熄灭的时间比V0要长,
也就是V0的阻燃性好,V1第二,V3第三,V4的和不是阻燃的一样.
HB：UL94标准中低的阻燃等级。要求对于3到13毫米厚的样品，燃烧速度小于40毫米每分钟；小
于3毫米厚的样品，燃烧速度小于70毫米每分钟；或者在100毫米的标志前熄灭。
V-2：对样品进行两次10秒的燃烧测试后，火焰在30秒内熄灭。可以引燃30cm下方的药棉。
V-1：对样品进行两次10秒的燃烧测试后，火焰在30秒内熄灭。不能引燃30cm下方的药棉。
V-0：对样品进行两次10秒的燃烧测试后，火焰在10秒内熄灭。不能有燃烧物掉下。
he FTT UL 94 tests the flammability of plastic materials for parts in devices and appliances. The apparatus is supplied as a complete system incorporating all the features necessary for ease of use safety. It conforms to all five UL 94 horizontal and vertical burner tests and associated ASTM international standards. These are:
Horizontal Burning Test; UL 94HB (ASTM D635, IEC IECS
Vertical Burning Test: UL 94 V-0, V-1, or V-2 (ASTM D3801, IEC IECS
500 W (125mm) Vertical Burning Test: 5VA or 5VB (ASTM D5048, IEC IECS
Thin Material Vertical Burning Test: VTM-0, VTM-1, or VTM-2 (ASTM D4804, IS
Horizontal Burning Foamed Material Test: HF- 1, HF-2 or HBF (ASTM D4986, IS
Burners (ASTM D5025, ASTM D5207, ISS
FEATURES
A bench mounted draft free combustion chamber having a large inside volume of 1.0m3 and fitted with an interior light and exhaust fan to enable simple evacuation of combustion products
Large door and window made from toughened safety glass giving a generous view of the specimen during a test.
Specimen holders.
Fully adjustable horizontal and vertical specimen supports.
A burner in compliance with ASTM D5025, with simple angle adjustment (0°, 20°, 45°) and precision gas control system including gas flow meter, pressure regulator and pressure gauge (manometer).
Two access ports enabling easy entry to the chamber for movement of the burner and specimen.
A burner wing tip.
Three digital test duration timers for accurate but simplified operation