In industrial plants, refineries, and oil fields, workers are required to wear Flame Resistant (FR) clothing. This gear is highly regulated, heavily tested, and incredibly expensive. But the way workers maintain this gear after hours is completely undermining the technology. The biggest culprit? Industrial laundry services and commercial dry cleaners who starch and heavily press FR garments to make them look crisp and professional.
To understand why starch kills FR clothing, you have to understand how the two main types of FR fabrics work. Inherently FR fabrics, like Nomex, have the fire resistance baked into the molecular structure of the fiber. Treated FR fabrics, like traditional Indura cotton, have a chemical fire retardant bonded to the inside of the cotton fibers. When exposed to a flash fire, this chemical reacts with the heat and releases a gas that smothers the flame, causing the fabric to char and self-extinguish rather than burst into flames.
When you apply starch to an FR garment, you are coating the fibers in a thin layer of refined, highly flammable carbohydrate. Starch is basically paper glue. In a flash fire, that starch coating ignites instantly, burning hotter and faster than the actual fabric underneath it. This intense, localized heat from the burning starch can actually overwhelm the FR chemical treatment, causing the fabric underneath to break open and expose the worker's skin to the fire.
Even with inherently FR fabrics like Nomex, starch is a disaster. Nomex doesn't burn, but when exposed to extreme heat, it will melt and shrink. A heavy starch coating alters the way the fabric breathes and reacts to thermal energy, causing it to shrink unevenly and rip at the seams during a flash fire, completely defeating the protective envelope of the garment.
FR garments should never be dry-cleaned. The harsh dry-cleaning solvents strip the chemical treatments right out of the fabric. And they should absolutely never be starched. If your safety department is using an industrial laundry service, you must explicitly verify in the contract that they are using a strict "no starch, no fabric softener" protocol for your FR loads. If a worker hands you an FR shirt that has sharp, stiff creases down the sleeves and feels like cardboard, that shirt is a severe burn hazard and should not be allowed on the refinery floor. FR clothing is meant to protect your life, not win a beauty pageant.
