Flame retardant coveralls of types 5 and 6 provide protection against flames, heat, and potentially hazardous particulates in environments where there's a risk of fire or exposure to heat sources. These coveralls are commonly used in industries such as firefighting, oil and gas, welding, and other situations where workers may face thermal hazards.

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ISO 14116:2015 Protective clothing — Protection against flame —

Limited flame spread materials, material assemblies and clothing.
Type 5 – Protection against airborne solid particulate chemicals 
(Norm: EN ISO 13982-1)
Type 6 – Limited protection against liquid mist (Norm: EN 13034)
EN 13688:2013 Protective clothing - General requirements
Electrostatic discharge if properly grounded (Norm: EN 1149-5: 2008)