为了降低水泥膨胀所引起的膨胀应力，延长瓷绝缘子的使用寿命，在胶装时一般在瓷体和水泥之间涂一层沥青缓冲层。

In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.

youdao

为了降低水泥膨胀所引起的膨胀应力，延长瓷绝缘子的使用寿命，在胶装时一般在瓷体和水泥之间涂一层沥青缓冲层。

In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.

youdao