一、环氧层压玻璃布板产品介绍是用浸渍纸、棉布、玻璃布、浸渍酚醛、环氧树脂,经烘焙热压而成的硬质板状绝缘材料。环氧酚醛树脂绝缘板具有较高的机械强度、介电性能、耐油性和耐腐蚀性,环氧酚醛树脂绝缘板适用于要求较高的电工机械、电器设备中作绝缘结构件,并可在潮湿环境和变压器中使用,耐热等级为B级。
二、环氧层压玻璃布板技术要求
1.外观、表面应平整光滑,不允许有杂质和其他明显的缺陷,允许有轻微的擦伤,边缘应切割整齐,端面不得有分层和裂纹。
2.尺寸:面积不得小于380×480平方毫米,如需特殊规格,可同供需双方协议生产。其它数据详见机电部标准。标准规格1200*2400 1000*2000 特殊规格可根客户所需按图纸进行加工。
3.产品可根用户要求,加工成各种规格板、管、垫、法兰、瓦、等异形件。
、环氧层压玻璃布板技术参数
1、外观 表面应平滑,无气泡、皱纹和裂纹。
2、标称厚度及允许偏差见表1。
表1 mm
<**** ****="width:715px;" cellspacing="0" cellpadding="0" border="1"> <****> <****> <**** ****="width:90.1pt;background-color:#cccccc;" colspan="2">标称厚度****> <**** ****="width:108.4pt;background-color:#cccccc;">偏差****> <**** ****="width:108.4pt;background-color:#cccccc;">标准厚度****> <**** ****="width:101.55pt;background-color:#cccccc;">偏差****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">0.4****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.10****> <**** ****="width:108.4pt;background-color:****ansparent;">8.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±0.72****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">0.5****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.12****> <**** ****="width:108.4pt;background-color:****ansparent;">10.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±0.82****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">0.6****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.13****> <**** ****="width:108.4pt;background-color:****ansparent;">12.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±0.94****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">0.8****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.16****> <**** ****="width:108.4pt;background-color:****ansparent;">14.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.02****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">1.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.18****> <**** ****="width:108.4pt;background-color:****ansparent;">16.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.12****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">1.2****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.20****> <**** ****="width:108.4pt;background-color:****ansparent;">20.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.30****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">1.6****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.24****> <**** ****="width:108.4pt;background-color:****ansparent;">25.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.50****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">2.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.28****> <**** ****="width:108.4pt;background-color:****ansparent;">30.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.70****> ****> <****> <**** ****="width:90.1pt;background-color:****ansparent;" colspan="2">2.5****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.33****> <**** ****="width:108.4pt;background-color:****ansparent;">35.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±1.95****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:88.95pt;background-color:****ansparent;">3.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.37****> <**** ****="width:108.4pt;background-color:****ansparent;">40.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±2.10****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:88.95pt;background-color:****ansparent;">4.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.45****> <**** ****="width:108.4pt;background-color:****ansparent;">45.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±2.30****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:88.95pt;background-color:****ansparent;">5.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.52****> <**** ****="width:108.4pt;background-color:****ansparent;">50.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±2.45****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:88.95pt;background-color:****ansparent;">6.0****> <**** ****="width:108.4pt;background-color:****ansparent;">±0.60****> <**** ****="width:108.4pt;background-color:****ansparent;">60.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±2.50****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:88.95pt;background-color:****ansparent;"> ****> <**** ****="width:108.4pt;background-color:****ansparent;"> ****> <**** ****="width:108.4pt;background-color:****ansparent;">80.0****> <**** ****="width:101.55pt;background-color:****ansparent;">±2.80****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:407.3pt;background-color:****ansparent;" colspan="4">注: 1 其他允许偏差可由供需双方协商。 2 对于标称厚度不在所列的优选厚度之一者,其允许偏差应采用下一个较大的优选厚度的偏差。****> ****> ****> ****>
3、平直度见表2。表2 层压板表面距直尺的大允许偏差mm
<**** ****="width:715px;" cellspacing="0" cellpadding="0" border="1"> <****> <****> <**** ****="width:124.5pt;background-color:#cccccc;" rowspan="2">厚度 (d)****> <**** ****="width:277.5pt;background-color:#cccccc;" colspan="2">直尺长度****> ****> <****> <**** ****="width:5cm;background-color:#cccccc;">1000****> <**** ****="width:135pt;background-color:#cccccc;">500****> ****> <****> <**** ****="width:124.5pt;background-color:****ansparent;">1.6≤d≤3 3<> 6<> 8< d****> <**** ****="width:5cm;background-color:****ansparent;">见注 10 8 6****> <**** ****="width:135pt;background-color:****ansparent;">见注 2.5 2.0 1.5****> ****> <****> <**** ****="width:401.25pt;background-color:****ansparent;" colspan="3">>注:对标称厚度在1.6 mm≤d≤3 mm的允许偏差正在考虑之中****> ****> ****> ****>
4、性能要求见表4。表4性能要求
<**** ****="width:715px;" cellspacing="0" cellpadding="0" border="1"> <****> <****> <**** ****="width:37.6pt;background-color:#cccccc;" colspan="2">序 号****> <**** ****="width:149.7pt;background-color:#cccccc;">指 标 名 称****> <**** ****="width:63.2pt;background-color:#cccccc;">单 位****> <**** ****="width:73.7pt;background-color:#cccccc;">指 标 值****> <**** ****="width:84.25pt;background-color:#cccccc;">说明****> ****> <****> <**** ****="width:37.6pt;background-color:****ansparent;" colspan="2">1****> <**** ****="width:149.7pt;background-color:****ansparent;">垂直层向弯曲强度****> <**** ****="width:63.2pt;background-color:****ansparent;">MPa****> <**** ****="width:73.7pt;background-color:****ansparent;">≥340****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> <****> <**** ****="width:37.6pt;background-color:****ansparent;" colspan="2">2****> <**** ****="width:149.7pt;background-color:****ansparent;">平行层向冲击强度 (简支梁法)****> <**** ****="width:63.2pt;background-color:****ansparent;">KJ/****> <**** ****="width:73.7pt;background-color:****ansparent;">≥33****> <**** ****="width:84.25pt;background-color:****ansparent;" rowspan="2">两者之一满足本标准要求即可****> ****> <****> <**** ****="width:37.6pt;background-color:****ansparent;" colspan="2">3****> <**** ****="width:149.7pt;background-color:****ansparent;">平行层向冲击强度 (悬臂梁法)****> <**** ****="width:63.2pt;background-color:****ansparent;">kJ/****> <**** ****="width:73.7pt;background-color:****ansparent;">≥34****> ****> <****> <**** ****="width:37.6pt;background-color:****ansparent;" colspan="2">4****> <**** ****="width:149.7pt;background-color:****ansparent;">垂直层向电气强度 (90℃±2℃油中)****> <**** ****="width:63.2pt;background-color:****ansparent;">MV/m****> <**** ****="width:73.7pt;background-color:****ansparent;">见表5****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">5****> <**** ****="width:149.7pt;background-color:****ansparent;">平行层向击穿电压 (90℃±2℃油中)****> <**** ****="width:63.2pt;background-color:****ansparent;">kV****> <**** ****="width:73.7pt;background-color:****ansparent;">≥35****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">6a****> <**** ****="width:149.7pt;background-color:****ansparent;">介电常数 (48Hz-62Hz以下)****> <**** ****="width:63.2pt;background-color:****ansparent;">-****> <**** ****="width:73.7pt;background-color:****ansparent;">≤5.5****> <**** ****="width:84.25pt;background-color:****ansparent;" rowspan="2">两者之一满足本标准要求即可****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">6b****> <**** ****="width:149.7pt;background-color:****ansparent;">介电常数 (1MHz以下)****> <**** ****="width:63.2pt;background-color:****ansparent;">-****> <**** ****="width:73.7pt;background-color:****ansparent;">≤5.5****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">7****> <**** ****="width:149.7pt;background-color:****ansparent;">马丁温度纵向****> <**** ****="width:63.2pt;background-color:****ansparent;">℃****> <**** ****="width:73.7pt;background-color:****ansparent;">≥200****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">8****> <**** ****="width:149.7pt;background-color:****ansparent;">热稳定性****> <**** ****="width:63.2pt;background-color:****ansparent;">℃****> <**** ****="width:73.7pt;background-color:****ansparent;">200****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">9****> <**** ****="width:149.7pt;background-color:****ansparent;">耐油性变压器油中4h****> <**** ****="width:63.2pt;background-color:****ansparent;">℃****> <**** ****="width:73.7pt;background-color:****ansparent;">130****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">10****> <**** ****="width:149.7pt;background-color:****ansparent;">拉伸强度纵向 横向****> <**** ****="width:63.2pt;background-color:****ansparent;">MPa****> <**** ****="width:73.7pt;background-color:****ansparent;">≥314 ≥216****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">11****> <**** ****="width:149.7pt;background-color:****ansparent;">粘合强度****> <**** ****="width:63.2pt;background-color:****ansparent;">N****> <**** ****="width:73.7pt;background-color:****ansparent;">≥5600****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">12****> <**** ****="width:149.7pt;background-color:****ansparent;">表面电阻率常态时 浸水后****> <**** ****="width:63.2pt;background-color:****ansparent;">MΩ****> <**** ****="width:73.7pt;background-color:****ansparent;">≥1× ≥1×****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">13****> <**** ****="width:149.7pt;background-color:****ansparent;">体积电阻率常态时 浸水后****> <**** ****="width:63.2pt;background-color:****ansparent;">MΩ·m****> <**** ****="width:73.7pt;background-color:****ansparent;">≥1× ≥1×****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">14****> <**** ****="width:149.7pt;background-color:****ansparent;">平行层向绝缘电阻常态时 浸水后****> <**** ****="width:63.2pt;background-color:****ansparent;">MΩ****> <**** ****="width:73.7pt;background-color:****ansparent;">≥1× ≥1×****> <**** ****="width:84.25pt;background-color:****ansparent;"> ****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">15a****> <**** ****="width:149.7pt;background-color:****ansparent;">介质损耗因数 (48Hz-62Hz以下)****> <**** ****="width:63.2pt;background-color:****ansparent;">-****> <**** ****="width:73.7pt;background-color:****ansparent;">≤0.04****> <**** ****="width:84.25pt;background-color:****ansparent;" rowspan="2">两者之一满足本标准要求即可****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">15b****> <**** ****="width:149.7pt;background-color:****ansparent;">介质损耗因数 (1MHz以下)****> <**** ****="width:63.2pt;background-color:****ansparent;">-****> <**** ****="width:73.7pt;background-color:****ansparent;">≤0.04****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">16****> <**** ****="width:149.7pt;background-color:****ansparent;">浸水后绝缘电阻****> <**** ****="width:63.2pt;background-color:****ansparent;">Ω****> <**** ****="width:73.7pt;background-color:****ansparent;">≥5.0×****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">17****> <**** ****="width:149.7pt;background-color:****ansparent;">密度****> <**** ****="width:63.2pt;background-color:****ansparent;">g/****> <**** ****="width:73.7pt;background-color:****ansparent;">(1.7-1.9)****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> <****> <**** ****="background-color:****ansparent;"> ****> <**** ****="width:36.45pt;background-color:****ansparent;">18****> <**** ****="width:149.7pt;background-color:****ansparent;">吸水性****> <**** ****="width:63.2pt;background-color:****ansparent;">mg****> <**** ****="width:73.7pt;background-color:****ansparent;">见表6****> <**** ****="width:84.25pt;background-color:****ansparent;">-****> ****> ****> ****>
表5垂直层向电气强度
<**** ****="width:715px;" cellspacing="0" cellpadding="0" border="1"> <****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">平均厚度 mm****> <**** ****="width:140.2pt;background-color:#cccccc;">电气强度 MV/m****> <**** ****="width:64pt;background-color:#cccccc;">厚度 mm****> <**** ****="width:140.2pt;background-color:#cccccc;">电气强度 MV/m****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.4****> <**** ****="width:140.2pt;background-color:#cccccc;">≥16.9****> <**** ****="width:64pt;background-color:#cccccc;">1.6****> <**** ****="width:140.2pt;background-color:#cccccc;">≥12.7****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.5****> <**** ****="width:140.2pt;background-color:#cccccc;">≥16.1****> <**** ****="width:64pt;background-color:#cccccc;">1.8****> <**** ****="width:140.2pt;background-color:#cccccc;">≥12.2****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.6****> <**** ****="width:140.2pt;background-color:#cccccc;">≥15.6****> <**** ****="width:64pt;background-color:#cccccc;">2.0****> <**** ****="width:140.2pt;background-color:#cccccc;">≥11.8****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.7****> <**** ****="width:140.2pt;background-color:#cccccc;">≥15.2****> <**** ****="width:64pt;background-color:#cccccc;">2.2****> <**** ****="width:140.2pt;background-color:#cccccc;">≥11.4****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.8****> <**** ****="width:140.2pt;background-color:#cccccc;">≥14.8****> <**** ****="width:64pt;background-color:#cccccc;">2.4****> <**** ****="width:140.2pt;background-color:#cccccc;">≥11.1****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">0.9****> <**** ****="width:140.2pt;background-color:#cccccc;">≥14.5****> <**** ****="width:64pt;background-color:#cccccc;">2.5****> <**** ****="width:140.2pt;background-color:#cccccc;">≥10.9****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">1.0****> <**** ****="width:140.2pt;background-color:#cccccc;">≥14.2****> <**** ****="width:64pt;background-color:#cccccc;">2.6****> <**** ****="width:140.2pt;background-color:#cccccc;">≥10.8****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">1.2****> <**** ****="width:140.2pt;background-color:#cccccc;">≥13.7****> <**** ****="width:64pt;background-color:#cccccc;">2.8****> <**** ****="width:140.2pt;background-color:#cccccc;">≥10.5****> ****> <****> <**** ****="width:64.05pt;background-color:#cccccc;">1.4****> <**** ****="width:140.2pt;background-color:#cccccc;">≥13.2****> <**** ****="width:64pt;background-color:#cccccc;">3.0****> <**** ****="width:140.2pt;background-color:#cccccc;">≥10.2****> ****> ****> ****>
注:1 对90℃±2℃油中垂直层向电气强度,可任选20s逐级升压和1min耐压试验要求中的一种。对符合二者之一要求的材料,应视其90℃±2℃油中垂直层向电气强度是符合本标准要求的。 2 如果测得的试样厚度算术平均值是介于表中两厚度之间,则其指标值应从内插法求取。如果测得的厚度算术平均值小于0.4mm,则其电气强度指标值取≥16.9MV/m。如果标称厚度为3mm,并且测得的厚度算术平均值大于3mm时,则其电气强度的指标值取≥10.2MV/m表6吸水性
<**** ****="margin:auto auto auto 1.15pt;width:656px;" cellspacing="0" cellpadding="0" border="1"> <****> <****> <**** ****="width:161.85pt;background-color:#cccccc;">试样厚度平均值 mm****> <**** ****="width:73.9pt;background-color:#cccccc;">吸水性 mg****> <**** ****="width:161.85pt;background-color:#cccccc;">试样厚度平均值 mm****> <**** ****="width:73.9pt;background-color:#cccccc;">吸水性 mg****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">0.4****> <**** ****="width:73.9pt;background-color:****ansparent;">≤17****> <**** ****="width:161.85pt;background-color:****ansparent;">5****> <**** ****="width:73.9pt;background-color:****ansparent;">≤25****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">0.5****> <**** ****="width:73.9pt;background-color:****ansparent;">≤17****> <**** ****="width:161.85pt;background-color:****ansparent;">6****> <**** ****="width:73.9pt;background-color:****ansparent;">≤27****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">0.6****> <**** ****="width:73.9pt;background-color:****ansparent;">≤17****> <**** ****="width:161.85pt;background-color:****ansparent;">8****> <**** ****="width:73.9pt;background-color:****ansparent;">≤31****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">0.8****> <**** ****="width:73.9pt;background-color:****ansparent;">≤18****> <**** ****="width:161.85pt;background-color:****ansparent;">10****> <**** ****="width:73.9pt;background-color:****ansparent;">≤34****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">1.0****> <**** ****="width:73.9pt;background-color:****ansparent;">≤18****> <**** ****="width:161.85pt;background-color:****ansparent;">12****> <**** ****="width:73.9pt;background-color:****ansparent;">≤38****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">1.2****> <**** ****="width:73.9pt;background-color:****ansparent;">≤18****> <**** ****="width:161.85pt;background-color:****ansparent;">14****> <**** ****="width:73.9pt;background-color:****ansparent;">≤41****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">1.6****> <**** ****="width:73.9pt;background-color:****ansparent;">≤19****> <**** ****="width:161.85pt;background-color:****ansparent;">16****> <**** ****="width:73.9pt;background-color:****ansparent;">≤46****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">2.0****> <**** ****="width:73.9pt;background-color:****ansparent;">≤20****> <**** ****="width:161.85pt;background-color:****ansparent;">20****> <**** ****="width:73.9pt;background-color:****ansparent;">≤52****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">2.5****> <**** ****="width:73.9pt;background-color:****ansparent;">≤21****> <**** ****="width:161.85pt;background-color:****ansparent;">25****> <**** ****="width:73.9pt;background-color:****ansparent;">≤61****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">3****> <**** ****="width:73.9pt;background-color:****ansparent;">≤22****> <**** ****="width:161.85pt;background-color:****ansparent;">单面加工至22.5****> <**** ****="width:73.9pt;background-color:****ansparent;">≤73****> ****> <****> <**** ****="width:161.85pt;background-color:****ansparent;">4****> <**** ****="width:73.9pt;background-color:****ansparent;">≤23****> <**** ****="width:73.9pt;background-color:****ansparent;"> ****> ****> ****> ****>
注:1如果测得的试样厚度算术平均值是介于表中两厚度之间,则其指标值应从内插法求得。2如果测得的厚度算术平均值小于0.4mm,则其指标值取≤17mg。如果标称厚度为25mm并测得的厚度算术平均值大于25mm时,则其指标值取≤61mg。标称厚度大于25mm的板材,则应从单面加工至22.5mm且加工面应是比较光滑的。
是由电工用无碱玻璃纤维布浸以环氧酚醛树脂,经烘焙、热压而成。
具有较高的机械和介电性能,较好的耐热性和耐潮性,并有良好的机械加工性,耐热等级为B级。
适用于电机、电器设备中作为绝缘结构零部件,并可在潮温环境和变压器油中使用。
以较高的机械性能和电气性能,广泛应用在发电机、马达、电子器具上作为绝缘材料和构件。在变压器油压环境和湿度环境中也非常适用。
7、环氧树脂和所用的固化剂的反应是通过直接加成反应或树脂分子中环氧基的开环聚合反应来进行的,没有水或其它挥发性副产物放出。它们和不饱和聚酯树脂、酚醛树脂相比,在固化过程中显示出很低的收缩性(小于2%)。