Methylcellulose (or methyl cellulose) is a chemical compound derived from the cellulose of vegetables. Like cellulose, it is not digestible. "A" type food gums are Methylcellulose or modified vegetable gum. Hydroxypropyl Methylcellulose is also known as carbohydrate gum. Unlike other gelifiers, Methylcellulose gelifies when heat is applied. When cold it acts as a thickener. There is a wide range of viscosity in Methylcellulose, which affects the final result of the gelification.