“These hats have one serious drawback, aluminum is a great conductor of electricity.” Bullard’s distinctive three-rib, heat-resistant fiberglass hard hat was developed in the 1940s. In the ...

The company’s distinctive three-rib, heat-resistant fiberglass hard hat was developed in the 1940s. In the 1950s and 1960s, thermoplastics replaced fiberglass. In 1982, the standard hard hat ...

The original Hard Boiled Hat was manufactured out of steamed canvas, glue, a leather brim, and black paint. Over the years, mainly because of advances in materials such as fiberglass, the hard hat ...

which are made of fiberglass materials instead of the plastic and composite materials most of the common hard hats are constructed from today. That said, I sell these paintjobs as novelty items ...

By the early 1940s, hard hats transitioned to fiberglass, then a decade later there was a transition to thermoplastics, which is still used today. Gone are the hard hats made from steamed canvas ...