Posted By GavinR Hi Guys, Quick question regarding how to identify if you are likely to approach a WEL for a substance? E.g. Small abrasive flapper disc used to polish a steel surface. 15-20 times per shift (8 hr) for approx 15-30 secs per time. The MSDS for the disc gives WEL for dusts. No other R phrasing from MSDS for the substance. Very little dust can be seen during the process and we are only introducing this process now. Good ventilation in the area, not confined. Wondering if there was any need for personal monitoring? Ta

Posted By GavinR Hi, Its as follows: Silicon Carbide (0-30%) 10mg/m3, Aluminium Oxide (0-30%) 10mg/m3, Zirconium Oxide (0-30%) 5 mg/m3, Cryolite (0-10%) 2.5mg/m3 and Kaolin (0-10%) 10 mg/m3. Cheers!

Posted By GavinR Thanks, but i'm actually unsure how i can make the call for this and other such substances? If i was to approach it by arranging personal monitoring, atmospheric montoring, etc for every substance with a WEL surely it would be inpractiable. I want to learn a method of determining when specific testing is required and when it is not. Sorry, problem seems like a stupid question but i don;t want to miss something out during the assessments but i know monitoring will cost the earth for the amount of things we have! Cheers

Posted By Coshh Assessor Well, I would start by looking at the processes / areas that you expect to be the worst - where you know there is most dust, most vapour in relation to the WEL. Then do some monitoring for those - if they are well below the WEL, go home happy; if they are high, then deal with those exposures and then go on to look at the ones lower on the list. So rank them all and then work down the list until you can see you can stop - rather than trying to make a judgement for each individual case in isolation, which I agree could end up with going over the top.