The PE separator is characterised by excellent starting
capability and is suitable for a battery used under good
road conditions in a clement or cold weather region. In
Japan, due to the decrease in vibration of the battery
caused by the improvement in road conditions and the
popularisation of the MF battery, the envelope-type
separator is required for expanded-type calcium electrodes.
The application of this separator has spread to about
70% in batteries for common passenger cars. The
separator has replaced the leaf-type SPG separator.