DIN EN 60371-3-3:1997
云母基绝缘材料规范.第3部分:各型材料规范.第3节:加热设备用硬质云母材料
Specification for insulating materials based on mica - Part 3: Specifications for individual materials - Sheet 3: Rigid mica materials for heating equipment (IEC 60371-3-3:1983); German version EN 60371-3-3:1995