Helical spring, we can also call it spiral spring, is the composition of wounded flat ribbon metal with round cross section, typically in stainless steel and other alloy material. The load evenly spreads across each individual band therefore it has a relatively high spring load with smaller deflection range.
The length, sizes of them can be customized based on application. They usually be made of 301 Stainless Steel, Hastelloy C276, Elgiloy or equivalent, 316 Stainless Steel, Beryllium Copper (BeCu) and other materials what you want. According to the shape and winding direction, helical springs can be divided into ordinary cylindrical , variable diameter helical springs, and left and right springs.
Spring energized Seals are commonly used for medium to high pressure applications under very slow or static condition. Recommended for vacuum and cryogenic sealing application.So they are specifically used in Petrochemical Industry, Oil & Gas Industry, Semi-Conductor Industry, Food and Beverage Industry, Mining Industry and many other industries.