Standards
In 1997, the American National Standards Institute revised its performance standards for hard hats. What exactly the standards are is not publicly disclosed except to paying members. Conformity to these standards and regulation are not necessary but almost all manufactures comply:
- ANSI Type I / CSA Type 1 hard hats meet stringent vertical impact and penetration requirements.
- ANSI Type II / CSA Type 2 hard hats meet both vertical and lateral impact and penetration requirements and have a foam inner liner of expanded polystyrene (EPS).
- A Class E hard hat has been proof-tested to insulate up to 20,000 volts of electrical potential.
- ANSI have compliance for hard hats and their combustibility or flammability criteria.
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—John Dos Passos (1896–1970)