Which of the following is NOT a category of skin contaminants?

The identification of contaminants that affect the skin is crucial in aircraft armament systems, as it relates to safety and health. The categories of skin contaminants are typically divided into three recognized types: chemical, biological, and physical.

Chemical contaminants include substances like solvents, oils, and fuels that can harm the skin or cause allergic reactions. Biological contaminants involve living organisms, such as bacteria, fungi, or viruses, that may cause infections or other health issues.

The term "mechanical" is not recognized as a typical category of skin contaminants in professional contexts. Instead, "physical" contaminants refer to non-living harmful agents such as dust, dirt, or debris that can cause irritation or abrasion.

Understanding these categories is essential for maintaining safety standards and ensuring that personnel are protected from harmful substances during their work.