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HRC 4

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Garments compliant to HRC (Hazard Risk Category) 4, as defined by NFPA 70E, 2009 edition, have an arc rating that is greater than or equal to 40 cal/cm².

Common arc ratings that are available in HRC 4 clothing include 40 cal/cm², 65 cal/cm² and 100 cal/cm². These high arc ratings are achieved with multiple layers of flame resistant fabrics and modacrylic liners. However, many cold weather work wear items, such as a quilted coat, may have an arc rating of 40 cal/cm² or higher. 

To aid in a decision-making process, consider this:

* HRC 4 cold weather work wear is just that: it is a highly durable coat and bib that you would wear all day in the elements.  

* HRC 4 short coats and bib overalls are less durable fabrics, but provide the protection. These items are intended for indoor use or limited outdoor jobs. 

HRC 4 may also be called Level 4. In some cases, incorrectly, users may refer to HRC 4 as Class 4. Class 4 applies to ANSI standards, and other standards, but not to NFPA 70E. HRC and Level are correct identifiers. To ensure correct communication of a need, use the arc rating.