I think the following confirms what the previous posting has stated:
A study by the European Chemicals Agency (ECHA), the organisation responsible for REACH, found that of 1,181 companies they inspected in 29 countries, mostly ‘downstream users’, i.e. formulators, regarding compliance with REACH, 52% were producing safety data sheets described in the study as ‘deficient’.
ECHA – REACH-EN-FORCE2
The risk assessment should consider the work activity, including:
All the substances hazardous to health (including biological agents and simple asphyxiants) arising from the work (use, produced, synthesised, created as waste or by-products, or released from processes or during accidents, incidents and emergencies);
Work done by sub-contractors, at the workplace, that may expose employees to substances hazardous to health.
COSHH ACoP, para. 57
Any risk assessment must start with the task, identify the chemicals being used, how they are used, and the resulting hazard.
Furthermore be aware that there are thousands of chemicals that have not been assigned a risk phrase/hazard statement and will thus almost certainly not appear on the safety data sheet. You can take water as an example. For many not a hazard, but if there is excessive exposure this can result in contact dermatitis and should be assessed and managed for COSHH compliance. Incidentally, wearing of occlusive gloves is equivalent to wet work, so also needs assessment, even if there is no direct exposure to chemicals.
There are no ‘short cuts’ for COSHH.
Chris