 Typically, most countries use the building elements curve for residential and commercial spaces, which is nearly identical in most countries as that is what results by burning wood.The building elements curve is characterized jointly by, including, but not limited to, DIN4102, BS476, ASTM E119, ULC-S101, etc.For industrial facilities in the hydrocarbon & petrochemical industries, a hydrocarbon curve (such as UL 1709) is used, reflecting a more rapid temperature rise.