Lupus is an autoimmune disease. This means that the body's natural defense system (immune system) attacks healthy tissues instead of attacking only things like bacteria and viruses. This causes inflammation. Although some people with lupus have only mild symptoms, the disease is lifelong and can become severe.
Heat Settings for Fabrics. Use these basic iron temperature setting guidelines for your fabrics: acetate, 290 F; acrylic or nylon, 275 F; cotton, 400 F; linen, 445 F; polyester, silk or wool, 300 F; rayon, 375 F; triacetate, 390 F. For blended fabrics, use the lowest temperature recommended for the fibers in the blend.
To make cotton iron-free, the fabric is typically soaked in formaldehyde. (Credit: Robert Sheie). Your suspicion about formaldehyde in no-iron shirts, also known as wrinkle-free, is spot on. To be sure, you could write to the company and see if they disclose the chemical treatment or hide behind proprietary rights. I hate to iron as much as the next person, but to make cotton iron-free, the fabric is typically soaked in formaldehyde. When you press it flat it becomes wrinkle-resistant. Retailers warn that due to the change in molecular structure of the cotton shirt, the fabric becomes more brittle.