DELTA 3200 Professional has an ISO/ASA speed rating of 1000/31° (1000ASA, 31 DIN) to daylight.
Amazing results can be achieved with pushing it to 3200 though, as it is specifically made to have exceptional nice contrast & details in the blacks + highlights when doing so (compared to other stocks when pushing so many stops)!
 
ILFORD DELTA 3200 PROFESSIONAL is the world’s fastest black & white film. This panchromatic film is the perfect choice for any difficult available light photography conditions.
With its liberating high speed, unobtrusive grain structure and wide tonal range, DELTA 3200 is ideal for fast action and low light photography including night time shots, gigs, sport and indoor architectural applications where flash photography is forbidden.
DELTA 3200 can be processed in a wide range of different developers using spiral tanks, deep tanks and automatic processors.