Nonhazardous liquid-protective aprons cover the front of the worker from the chest to the knee or below. Sometimes called bib aprons, they are sleeveless and have an open back to keep workers cooler than full-coverage garments. Nonhazardous liquids include paint, water, and mild cleaning chemicals encountered in maintenance, autobody, and wastewater facilities.

Hazardous-chemical protective aprons cover the front of the worker from the chest to the knee or below. Sometimes called bib aprons, they are sleeveless and have an open back to keep workers cooler than full-coverage garments. Hazardous chemicals are encountered in labs, chemical manufacturing, and petroleum processing facilities.

Nonhazardous liquid-protective smocks have sleeves and tie on the back to cover a worker's front, sides, arms, and shoulders. They are knee length or longer. Nonhazardous liquids include paint, water, and mild cleaning chemicals encountered in maintenance, autobody, and wastewater facilities.

Hazardous-chemical protective smocks have sleeves and tie on the back to cover a worker's front, sides, arms, and shoulders. They are knee length or longer. Hazardous chemicals are encountered in labs, chemical manufacturing, and petroleum processing facilities.

Chemical-protective smocks with secondary flame resistance are worn over a base layer of personal flame-resistant clothing (such as shirts and pants) when there is an intermittent or low risk of encountering fire. These garments are not a primary source of flame protection. Smocks have sleeves and tie on the back to cover a worker's front, sides, arms, and shoulders. They are knee length or longer. Hazardous chemicals are encountered in labs, chemical manufacturing, and petroleum processing facilities.