The main fluids flowing through them are natural gas and hot/cold water.Stainless flex hoses (ss flex hose) are manufactured from special stainless sheet strips having the content stated in TSE and EN ISO European standards. Several material types are referred to in the relevant standards. So in order to explain the issue simpler, we will mention only the common types, known as 304/304L, 316/316L.
The stainless hoses have a melting point of approximately 1400-1450 degrees Celsius (⁰C). Therefore, they are very resistant against a possible fire.The outer coatings (tube) have no fire-preventive specification. The coating is expected to protect the hose against cleaning chemicals and not to pose any breathing hazard by releasing the hazardous chemicals it contains.