https://www.superiorwasher.com/washers/8880/430-Stainless-Steel-Flat-Washers.html
This video provides information about a type of flat washer made from special material — 430 stainless steel. The 430 stainless steel flat washers are used in corrosive and moderate heat applications as they are considered a reliable sealing hardware under these conditions.
430 stainless steel flat washers are commonly used in various industries and applications such as heating elements, washing appliances, farming equipment, chemical processing and chimneys. This type of flat washer can be custom-manufactured according to the client’s specification.