Standard Specification for Electrical Insulating Varnishes
STANDARD published on 1.12.2025
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Designation standards: ASTM D3955-25
Publication date standards: 1.12.2025
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process. The varnishes are classified according to grades: Grade DA; Grade DO; Grade DM; Grade DS; Grade DW; and Grade DT. This specification covers both flexible and rigid, solvent and solventless insulating varnishes. The insulating varnishes are classified according to thermal classes: Class 130; Class 155; Class 180; Class 200; and Class 220. Quality conformance tests shall be performed to conform to the specified requirements.
Keywords:
varnish, air-dry, varnish, electrical, varnish, silicone, varnish, solvent containing, varnish, thixotropic, varnish, water containing,, ICS Number Code 29.035.60 (Varnished fabrics)