BS EN IEC 60370:2018

What is BS EN IEC 60370-Thermal endurance of insulating resins and varnishes about? 

BS EN IEC 60370 is an international standard that describes methods for thermal endurance testing. The main objective of BS EN IEC 60370 is to determine the quality and performance of resins and varnish that are used as insulating materials. 

BS EN IEC 60370 covers methods of test for the determination of thermal endurance of electrical insulating resins and varnishes for impregnation purposes. It is done by means of impregnating glass cloth and measuring electric strength or breakdown voltage before and after heat ageing. 

It covers the materials described in IEC 60455‑3‑5 and IEC 60464‑3‑2 and similar materials. 

Who is BS EN IEC 60370-Thermal endurance of insulating resins and varnishes for? 

BS EN IEC 60370  for thermal endurance of insulating resins is relevant to: 

• Manufacturers of electrical insulating resins and varnishes 
• Manufacturers of electrical applications  
• Electrical engineers
• Mechanical industry 

Why should you use BS EN IEC 60370- Thermal endurance of insulating resins and varnishes? 

Resins are the mixture of a reactive polymer with other reactive components such as hardener accelerator, inhibitor, or reactive diluent, and with or without filler and additives, whereby virtually no volatile matter is released during the subsequent curing reaction. 

BS EN IEC 60370 provides you with two test methods: 

• Curved electrode system 
• Ball to plate method 

These test methods can help determine properties such as electric strength and breakdown voltage.  

Testing and compliance with BS EN IEC 60370 provides you with the performance of insulation materials. Properties of dielectric strength and resistance to heat that are vital for optimal insulation, can be assessed. As a result, the test results can help you make the right selection of electrical insulating materials that suit your specific engineering needs. You can demonstrate reliability and durability of your products by complying with BS EN IEC 60370. 

What’s changed since the last update? 

BS EN IEC 60370:2018 supersedes BS 7831:1995, which is withdrawn. This edition includes the following significant technical changes with respect to the previous edition: 

• This document is now describing two methods, the existing one, following ASTM D1932, and new a method following the requirements of IEC 60455-2 and IEC 60464-2 
• The theoretical background and way of calculation were removed and replaced by a reference to IEC 60216 
• The layout and numbering system was updated 
• For better understanding and illustration purposes examples were added