Which materials are commonly used in the construction of safety helmets?

The choice specifying polycarbonate, fiberglass, and high-density polyethylene accurately represents the materials commonly used in the construction of safety helmets due to their specific properties that enhance safety and performance.

Polycarbonate is favored for its high impact resistance, lightweight nature, and ability to withstand high temperatures, making it an ideal choice for head protection in various hazardous environments. Fiberglass is known for its strength and durability, providing excellent protection against impacts and penetration. High-density polyethylene is another popular material in helmet construction because of its strong resistance to chemical and environmental factors, as well as its lightweight characteristics, which improve comfort for the wearer.

Together, these materials contribute to helmets that are not only effective in protecting against physical hazards but are also practical for extended use in a range of occupational and recreational settings.