metallfog

Metallfog is a term used in some industrial safety contexts to describe a cloud of fine metal-containing particulates and fumes suspended in air that arises during metalworking and related operations. The phenomenon is most commonly observed in processes such as welding, grinding, cutting, smelting, galvanizing, or thermal spraying, where metal is heated, ablated, or mechanically dispersed.

The aerosols typically consist of metallic particles and metal oxides; particle size ranges from submicron to a few micrometers, enabling inhalation and deposition in the respiratory tract. The exact composition depends on the metal being worked and additives in the process.

Health and safety considerations focus on inhalation exposure and irritation. Inhalation of metallfog can cause acute effects such as irritation of the eyes, nose, throat, and lungs, and with repeated exposure metal fume fever and potential long-term respiratory or cardiovascular effects. The risk profile varies with metal type; zinc oxide, iron, copper, and nickel fumes are common concerns.

Workplace controls emphasize source reduction and capture of emissions. Elimination or isolation of sources, local exhaust ventilation, enclosures, and wet or low-dust machining methods reduce emissions. Personal protective equipment such as respirators and eye protection, along with air monitoring and adherence to national or international exposure limits, are standard components of risk management.

Terminology varies by region and industry. Metallfog is not a formal scientific term; more standardized terms include metal fumes and metal aerosols. The phrase is used by some language communities and practitioners to describe the visible or measurable fog of metal particles produced during processing.