Modal fabric is very similar to Viscose, Rayon, and Lyocell. But modal is usually compared to lyocell, which is the organic form of Rayon. Modal and lyocell are both organically sourced; Organic Rayon or lyocell is obtained from the eucalyptus tree. The steps involved in the production process are very similar. However, Lyocell or organic Rayon, as it is also called, is more eco-friendlier than modal. The production of modal fabric uses a chemical known as sodium hydroxide. The manufacturing process of organic Rayon does not involve any chemicals and is entirely eco-friendly.