1.Previous
3.Next

affordable aluminum became popular for hard hats around 1938, except for electrical applications. Fiberglass came into use in the 1940s.Injection-molded thermoplastics appeared in the 1950s, and began to dominate in the 1960s. Easily shaped with heat, it is cost-effective to manufacture. In 1952, MSA offered the Shockgard Helmet to protect linemen from electrical shock of up to 10,000

1.Previous
3.Next