High Quality Content by WIKIPEDIA articles! Sclerotin is a component of the cuticles of various Arthropoda, most particularly insects. It is formed by cross-linking members of particular classes of protein molecules, a biochemical process called sclerotization, but technically. The resulting material adds physical stiffness to the toughness of an insect`s chitinous exoskeleton. It is particularly prominent in the thicker, armoured parts of insect and Arachnid integument, such as in the biting mouthparts and sclerites of scorpions and beetles.