The maximum operating temperature (ranging from Class B at to Class H at

Used as slot insulation and between commutator segments.

Minimum voltage thresholds the material must withstand before failing.

The standard outlines several parameters to ensure safety and performance in electrical machinery:

While many modern standards have shifted toward synthetic polymers, mica-based materials remain indispensable for "heavy-duty" electrical applications where reliability under extreme heat is non-negotiable. Manufacturers in the CIS region still reference GOST 25045 to ensure compatibility with legacy industrial infrastructure and to maintain a baseline of proven material durability. Sciences Of Europe No 133 (2024) - Calaméo