If a substance is dangerous for supply, the supplier must send you a data sheet when the product is first ordered, if the formulation changes, or if you ask for a sheet. If it is not dangerous for supply the supplier should include instructions for safe use with the package. Report suppliers who refuse to provide safety information to HSE.
The parts of a safety data sheet you may find most useful are:
[Further information on Safety data sheets](http://www.hse.gov.uk/coshh/basics/datasheets.htm) is available.