Invar® 36 Alloy Rods, Bars, Plates and Sheet are available from Professional Plastics. Invar 36 is one of the controlled expansion alloys. It has an expansion rate roughly 10 % that of standard carbon steels. Also known as "Alloy E 36" or simply "Alloy 36", this amazing alloy is second only to Super Invar in having the lowest CTE available. Note: Recent testing has determined that increased hardness will decrease CTE in all temperature ranges in Invar alloys. Professional Plastics maintains 20 warehouses in the USA, Singapore and Taiwan. Buy Online or Request A Quote below.