Taped seam chemical protection coveralls of types 4B, 5B, and 6B are specialized protective garments designed to provide an additional level of protection against chemical hazards, particularly in situations where the risk of liquid penetration is higher. The "B" in the type classification indicates that the coveralls have taped seams, which enhances their ability to prevent liquid penetration through seams.

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Type 4B – Biological protection (Norm: EN 14126)
Type 5 – Protection against airborne solid particulate chemicals 
(Norm: EN ISO 13982-1)
Type 6 – Limited protection against liquid mist (Norm: EN 13034)
Electrostatic discharge if properly grounded (Norm: EN 1149-5: 2008)
Protection against particulate radioactive contamination (EN 1073-2)