Base materials for printed circuits; part 2: specifications; specification No. 4: epoxide woven glass fabric copper-clad laminated sheet, general purpose grade (IEC 249-2-4:1987/A2:1992)

This technical specification defines the requirements for unidirectional glass fiber-reinforced epoxy laminate materials used as substrates for printed circuit boards. It specifically addresses vertical burning behavior as a critical safety metric for electrical insulation applications. The document establishes rigorous testing procedures to evaluate the flammability characteristics of these composite materials under standardized fire conditions. It focuses on the performance of ordinary grade epoxy-based laminates reinforced with woven glass fibers, ensuring consistency in manufacturing and quality control across the industry. Compliance with this document ensures that materials meet specific safety thresholds regarding fire propagation when exposed to vertical ignition sources. The outlined methods provide a uniform framework for manufacturers and regulators to assess the inherent fire resistance of such laminates, facilitating international trade and safety assurance in electronic equipment manufacturing. Adherence to these guidelines helps maintain high standards of product reliability and user safety within the broader context of electrical and electronic components.