Benzoyl chloride has a new 8-hour WEL of 2.8 mg/m³ (0.5 ppm). WES governs until 30 November 2026; WEL applies from 1 December once implemented. Check the WHS regulator.
Where it appears
Reactive acyl chloride may occur in fine chemical, pharmaceutical, dye and specialty production, toll synthesis, laboratories, drum/IBC transfer, filter changes, maintenance and waste. Vapour and mist potential matter; open sampling and line breaks can create peaks.
SEG and register checks
- Separate charge operators, sampling technicians, filter crews, maintenance and lab synthesis.
- Ask how long systems are open, whether LEV is capture-tested, and whether contractors are included.
- Name the substance on the register, SDS, permits, induction and spill plans.
Controls
- Eliminate or substitute and use closed charging or vapour return.
- Engineer sealed sampling, LEV, scrubbers and purge-before-break methods.
- Minimise open time; use line-break permits and vapour spill drills.
- Select compatible gloves, clothing and organic-vapour RPE with fit testing.
Monitoring readiness
Baseline representative campaign days, including charge, sample and line-break tasks. Agree validated media and recovery with the lab; report mg/m³ and ppm with assumptions. Do not use generic VOC badges without validation or invent a STEL. Compare to 2.8 mg/m³ (0.5 ppm), report LOD/LOQ, and keep dermal risk separate.
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