There are at least three bands called Sulphur.

1. There is a band called Sulphur that play black/death metal from Bergen, Norway, formed in 2000.
They are signed to well-known French label Osmose productions, on which they have released:

Outburst Of Desecration EP 2007 (2005 demo re-released)
Cursed Madness 2007
Thorns in Existence 2009

Links:

Dark Essence Records website: http://www.darkessencerecords.no/artists/sulphur/

Dark Essence Records webshop: http://www.karismarecords.bigcartel.com

2. There is also an Australian dark ambient act called SulphuR, which began as an experimentative project by Australian solo artist Mike S. at the turn of the millenium as an expressive force.
The majority of material is performed using live sampling and synthesis over a backdrop of brooding loops to bridge the bleak emotions of dark ambient with a death industrial paranoia.

Releases to date are:
Der Fluch des Lebens (CD) Cranial Fracture Recordings 2005

Tracks Appear On:
Like Music To Their Ears Vol. 2 (CD) The Chimera Vortex Mechanoise Labs 2004
DVT - Pulse Of The Mind (CDr) Stummenfilm Antihumanism Records 2005

3. And there was an English indie pop band called Sulphur that released 2 EPs ("Highchair" and "2cv") in 1994 on London's Transglobal Records. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.