UL94V0,V1,V2是不同阻燃等级.doc

如何理解 UL94HB , UL94-V0 , UL94-V1 , UL94-V2 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的阻燃性最好,V1第二,V3第三,V4的和不是阻燃的一样. 你提的V-0是UL94标准里的一种等级，根据UL94，大体可以分为：HB、V-2、V-1、V-0、5V，耐燃等级依次提高，HB是最低级别的，基本上不阻燃，一般电器产品使用V-2以上就基本上达到要求。楼上说得对，一般有5VA，5VB等级，这就很高的了。我们做到美国市场的塑胶件，与电子板接触的要用到5VA材料，但是很难做到，我们就在V）基础上加厚塑胶来达到5VA的要求。IEC 60695–2-10, the glow wire FR test, simulates theeffect of thermal stresses which may be produced byheat sources like glowing elements or overloaded resistors,in order to asses the fire hazard by a simulationtechnique. The glow wire test involves intimate contactbetween a hot wire and the surface of the part to betested at the point where the moulded part is most vulnerable.The temperature of the wire is maintained at960, 850, 750, 650 or 550 C. For HIPS usually 960, 850and sometimes 750 C are used, for PP mainly 960 or850 C. A contact time of 30 s between the hot wire andthe part surface is maintained and, in order to pass, thetest part should not maintain a flame for more than 30 safter retraction of the wire and should not generateburning drips. The official standard requires testing tobe done on the moulded part but, for the purpose of thisstudy, test plaques with varying thickness were used. UL94 V0/V2 The UL94 standard evaluates the actual response toheat and flame of materials under controlled laboratoryconditions. The UL94 test is performed with a 20 mmvertical flame by twice contacting a moulded samplewith dimensions of 12712.7thickness in mm for 10 s.In order to pass UL94 V2, the flame should extinguishwithin 30 s after each ignition and with a maximumburn time of 250 s for 5 samples. Burning drips areallowed. For UL94 V0 the flame should extinguishwithin 10 s after each ignition, with less than 50 s astotal burn for 5 samples and no burning drips. UL认证即美国保险商实验所进行的各种认证的总称。UL关于塑料燃烧性的认证方法有两种：一种是我们通常看到最多的UL–94 V0、V1、V2、V5，这是垂直燃烧的测试方法；另一种是我们一般很少见到的UL94