按阻燃特性的等级划分

按照UL<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">标准(UL94<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">、UL746E <span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">等)<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">规定的板材燃烧性的等级划分，可将基板材料划分为四类，即UL-94V0 级、UL-94V1级、UL-94V2级以及HB<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">级。

一般讲按照UL<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">标准检测达到阻燃HB<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">级的覆铜板，称为非阻燃类板(<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">俗称HB<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">板);<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">达到UL<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">标准中的垂直燃烧法的燃烧性要求的覆铜板(<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">阻燃特性最佳的等级为UL-94 V0 <span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">级)<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">，称为阻燃类板(<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">俗称V0<span style=""mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";">板)

PCB行业中的”阻燃级别”是个通俗说法，科学的说法是“燃烧性能级别”。关于材料燃烧性能分级的最低级别，采用的是水平燃烧试验方法，中国对应的标准为GB/T2408-1996塑料燃。