SIST EN 60893-3-7:2004/A1:2010

Overview

SIST EN 60893-3-7:2004/A1:2010 is a Slovenian adoption of the European and international standards (EN 60893-3-7:2004/A1:2009 and IEC 60893-3-7:2003/A1:2009). This standard outlines specifications for industrial rigid laminated sheets based on polyimide resins intended for use as electrical insulating materials. The document provides individual material requirements, focusing on key properties such as mechanical strength, electric strength, insulation resistance, and flammability performance.

Polyimide resin-based rigid laminated sheets are widely recognized for their excellent heat resistance, electrical insulation properties, and durability. These materials are essential for applications in electrical and electronic industries where reliability and safety are critical.

Key Topics

• Material Specifications: Defines the requirements that rigid laminated sheets must meet when manufactured with polyimide resins for electrical insulation purposes.
• Impact Strength: Sets revised minimum values for CHARPY and IZOD impact strengths, ensuring adequate mechanical robustness for all sheet types.
• Flexural Strength: Establishes minimum flexural strength requirements at room temperature and after high-temperature exposure, confirming the material's performance stability.
• Electrical Properties: Details minimum values for electrical strength and breakdown voltage, both perpendicular and parallel to the sheet laminations, to ensure high insulation performance.
• Insulation Resistance: Specifies minimum insulation resistance after immersion in water, indicating suitability for humid or challenging environments.
• Flammability: Assigns flammability categories to monitor laminate production consistency, though this is not a comprehensive assessment of fire hazards in all use conditions.
• Water Absorption: Includes maximum water absorption limits to safeguard material integrity in the presence of moisture.

Applications

Rigid laminated sheets based on polyimide resins offer a combination of electrical insulation, high thermal stability, and mechanical strength. Their primary applications include:

• Electrical Switchgear: Utilized as insulation barriers and supports in high-voltage switchgear due to their reliable dielectric properties.
• Motors and Transformers: Used for slot wedges, insulation end laminates, and support structures within electric motors and transformers, especially where high temperatures are expected.
• Printed Circuit Boards (PCBs): Serve as a base material in specialized PCBs for demanding or high-heat environments.
• Industrial Control Systems: Incorporated into relays, contactors, and other control equipment that require long-term electrical isolation and thermal endurance.
• Aerospace and Transport: Specified for electrical insulation components exposed to fluctuations in temperature and mechanical stress.

By adhering to SIST EN 60893-3-7:2004/A1:2010, manufacturers and users ensure that laminated sheets deliver predictable, standardized performance for critical electrical insulation tasks, supporting safer and more reliable system operation.

Related Standards

For further technical specification and harmonization, the following related standards should be referenced:

• IEC 60893-2: Provides general test methods for rigid laminated sheets based on thermosetting resins.
• EN 60893-3 Series: Covers requirements for other types of industrial rigid laminated sheets made from various resin systems.
• IEC 60626: Standard for combined flexible materials for electrical insulation.
• ISO 275: Outlines determination methods for water absorption in plastics.
• IEC 60216: Deals with the thermal endurance of insulation materials.

These references contribute to a comprehensive framework for material selection, testing, and quality assurance in the field of electrical insulating materials. Utilizing harmonized standards supports interoperability, safety, and regulatory compliance across international markets.