Propane, having said that, has an exceedingly high number of BTUs for each cubic foot in its outer cone, and so with the appropriate torch (injector design) it may make a faster and cleaner Reduce than acetylene, which is considerably more handy for heating and bending than acetylene. 455 kJ/mol.[29] https://www.propanraya.com/id/produk/propan-epoxy-bond