IEC 60740-1:20 05规定了叠片的特性。它们的优选用途是变压器和电感器的铁芯。叠片由IEC 60404-8-4和IEC 60404-8-7中规定的磁性材料片和条制成。主要变化如下: a)添加了层压条YS、YSUI1、YSUI2和层压YEE2-1的范围； b)在上述端部延伸的范围YEI 1； c)范围YED2、YEF2、YEL2、YES2、YM1-5A和YM1-7A型被取消； d)国家指定被取消； e)指定叠片的电特性； f)添加的叠片的机械特性； g)为层压类型YEI 1、YUI 1、YUI 2、YM1添加的孔； h)在附录A中，定义了偏振J和场强H在特定总视在功率中的转换。对于无功功率和功率损耗的特性，指定了方程和常数。

IEC 60740-1:2005 specifies the characteristics of laminations. Their preferred use is cores for transformers and inductors. The laminations are made of sheets and strips of magnetic materials, specified in IEC 60404-8-4 and IEC 60404-8-7. The main changes are listed below:
a) ranges with lamination strips YS, YSUI 1, YSUI 2 and laminations YEE 2-.L added;
b) range YEI 1 extended at the above end;
c) ranges YED 2, YEF 2, YEL 2, YES 2, Type YM 1-5a and YM 1-7a cancelled;
d) national designations cancelled;
e) electrical characteristics for the laminations specified;
f) mechanical characteristics for laminations added;
g) holes added for lamination types YEI 1, YUI 1, YUI 2, YM 1;
h) in Annex A, a conversion of the polarisation J and the field strength H in a specific total apparent power is defined. For the characteristics of the reactive power and the power loss, equations and constants are specified.