Which standard is referenced for closing, sealing, and reinforcement methods of fiberboard boxes?

The standard referenced for closing, sealing, and reinforcement methods of fiberboard boxes is ASTM D1974. This standard provides specific guidelines and requirements for properly sealing and reinforcing corrugated fiberboard boxes to ensure they are securely closed and can withstand the rigors of storage and transportation.

In the context of packaging, the proper sealing techniques and materials are critical for maintaining the integrity of the box and protecting its contents from damage. ASTM D1974 outlines various closure methods and the materials suitable for achieving a strong seal, which is essential for safety during shipping.

Other standards mentioned, like ISO 9001, focus on quality management systems more broadly and do not specifically address packaging methods. ANSI Z89.1 pertains to head protection and is unrelated to the packaging of fiberboard boxes. ASTM D5118 is concerned with the performance of fiberboard boxes for specific applications, but it does not primarily focus on the sealing and reinforcement methods like ASTM D1974 does. Thus, ASTM D1974 is the most relevant and correct choice for the given context.