Which of the following is NOT a required element on shipping papers for hazardous materials?

The presence of emergency contact information, UN number, and hazard class on shipping papers for hazardous materials is crucial for safety and regulatory compliance. Emergency contact information ensures that immediate assistance can be reached in case of an incident involving the materials. The UN number serves as a unique identifier for the specific type of hazardous material, which aids in proper identification and handling during transport. The hazard class categorizes the material based on its specific hazards, ensuring that anyone involved in the shipping or transport process is aware of the dangers associated with the material.

In contrast, a delivery schedule is not a necessary element on shipping papers for hazardous materials. While coordinating delivery is important for logistics, it does not pertain to the safety aspects and specific identification required for hazardous materials. Thus, it can be excluded from the mandatory information needed on shipping papers, making it the correct answer in this context.