COSHH assessment form. A printable COSHH assessment for a cleaning task — the product, the hazards from its safety data sheet, who is exposed and how, and the controls that actually apply.

COSHH assessment is the duty most often discharged by filing a folder of safety data sheets. A data sheet is the manufacturer's information about a product; an assessment is what that means for your people doing your task in your building, and the two are not the same document.

So the form is built around the task rather than the product. The same bleach is a different assessment in a ventilated kitchen and a windowless toilet block, and an assessment per product cannot say so.

Dilution and contact time are fields copied from the label, never printed. They are product-specific and they change between a manufacturer's formulations, and a ratio on a free form is somebody mixing to the wrong strength for years — which here means an ineffective clean or a chemical burn.

The sheet says explicitly that products must not be mixed, and that is not boilerplate. The two things that produce chlorine gas are under every sink in the country, and the people most at risk are working alone, at night, in a small room, trying to shift something stubborn.