SFX is Ilford HP5 with some different dyes to give the infra-red sensitivity. You can use at 200 ISO as a normal b&w film. It has the grain of HP5. I process like FP4 (120 film is 9 minutes in 1+6 Ilfotec DDX 20C) when I do this but you need to play around as the dev time depends on how you expose, agitation, temperature, etc.