Glass manufacturing is inherently hot work. Furnace temperatures often exceed 2,500 degrees Fahrenheit, and the environment must be carefully engineered to manage heat and protect workers. The tragic reality is that in the USA from 1992 to 2017, exposure to heat killed 815 workers and seriously injured more than 70,000. As extreme heat becomes more frequent, employers and regulators face a critical question: how to safeguard workers without shutting down industries that rely on high temperatures?
In 2024, the Occupational Safety and Health Administration (OSHA) released a draft rule titled “Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings.” The proposal seeks to create a uniform standard for all sectors under OSHA’s jurisdiction.
While worker safety is paramount, many manufacturers argue that OSHA’s proposed rule is too prescriptive. The National Association of Manufacturers (NAM), of which the Glass Manufacturing Industry Council (GMIC) is a member, has criticised the draft as unworkable, explaining that the rule would require employers to identify heat hazards, implement engineering and work‑practice controls, establish emergency response plans, train personnel, maintain extensive records and add paid break mandates.
From the perspective at GMIC, a uniform 80 degrees Fahrenheit trigger does not reflect the realities of glass production. Furnaces run continuously at extremely high temperatures, with robust ventilation, insulation and protective gear designed to manage heat.
In response to industry concerns, Senators Bill Cassidy (R‑LA) and Jim Risch (R‑ID) introduced the Heat Workforce Standards Act in 2026. The bill aims to block the Department of Labor from finalising or enforcing the 2024 heat standard.
Glass manufacturing relies on continuous melting and cooling cycles. Plants invest heavily in ventilation systems, refractory materials and personal protective equipment to manage heat. GMIC members routinely monitor ambient and personal temperatures, ensure proper hydration, and rotate tasks to minimise heat exposure. The draft OSHA rule does not differentiate between processes that inherently require high heat and those that can operate at moderate temperatures. Treating a glass furnace the same as an outdoor construction site oversimplifies the risk profile.
GMIC has a long history of collaborating with the U.S. Department of Energy to improve energy efficiency and reduce emissions. Projects like regenerative burners, waste‑heat recovery and electric melting demonstrate that innovation, not regulation, can reduce both heat exposure and greenhouse gas emissions. A prescriptive regulation could slow these efforts by forcing companies to allocate capital toward compliance instead of research and development.