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API RP 582

Recommended Practice Welding Guidelines for the Chemical, Oil, and Gas Industries, Fourth Edition
standard by American Petroleum Institute, 05/01/2023

ASTM D785-23

Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials
standard by ASTM International, 03/15/2023

IEC 60383-1 Ed. 5.0 b:2023

Insulators for overhead lines with a nominal voltage above 1000 V – Part 1: Ceramic or glass insulator units for a.c. systems – Definitions, test methods and acceptance criteria
standard by International Electrotechnical Commission, 07/01/2023