Manganese (dust / fume / compounds, as Mn) is a **WES_reduced** listing. Previous WES expressions in the CSV extract sit at **TWA 1 (dust); 1/3 (fume)** mg/m³. From **1 December 2026**, the Workplace Exposure Limit is **Inhalable 0.1; respirable 0.02** mg/m³ **as Mn** (per Safe Work Australia’s published changes and our CSV extract). That is...
From 1 December 2026, peracetic acid has a Workplace Exposure Limit (WEL) for the first time. Safe Work Australia lists it as a peak limitation of 0.4 ppm (1.24 mg/m³). The listing has no 8-hour TWA and no STEL. A peak limitation is the maximum concentration measured over the shortest time possible, not exceeding 15...
Portland cement is a **WES_reduced** listing on Safe Work Australia’s published changes. The Workplace Exposure Standard sits at **TWA 10** mg/m³. From **1 December 2026**, the Workplace Exposure Limit is **TWA 1 respirable** mg/m³ (per SWA’s published changes and our CSV extract). That is not a tidy rename of the same column — it is...
Why this pair matters Diacetyl (2,3-butanedione) is a new WEL substance: 0.04 mg/m³ (0.01 ppm) as an 8-hour TWA and 0.07 mg/m³ (0.02 ppm) as a STEL. WES remains the reference until 30 November 2026; WEL applies from 1 December 2026 once implemented. Check your WHS regulator. Where it shows up Flavour compounding and food...
Why HSE and ops should care But-2-yne-1,4-diol (2-butyne-1,4-diol) is a new airborne contaminant with an 8-hour WEL of 0.5 mg/m³. WES remains the reference until 30 November 2026; WEL applies from 1 December 2026 once implemented. Check your WHS regulator. Where airborne risk shows up Fine chemical manufacture, electroplating and formulation. Bag tipping, weighing, milling,...
Why this number matters 1-Bromopropane (n-propyl bromide or nPB) is a new WEL substance: 0.5 mg/m³ (0.1 ppm) as an 8-hour TWA. WES remains the reference until 30 November 2026; WEL applies from 1 December 2026 once implemented. Check your WHS regulator. Where it shows up Vapour degreasing and precision cleaning. Adhesive/coating formulations, aerosols and...
Two stories travel together in WHS channels: everything changes on 1 December 2026, and RCS halves to 0.025. For tunnelling dust programs, both need a clear correction. WES becomes WEL and new entries appear, including DPM as respirable elemental carbon. But the RCS value remains 0.05 mg/m³ respirable on 1 December 2026. Do not write...
Tunnelling puts people and diesel plant in the same confined air volume for long shifts. Diesel particulate matter (DPM) is the particulate fraction of diesel exhaust that occupational hygienists sample when discussing elemental carbon in a heading, portal or plant bay. From 1 December 2026, Safe Work Australia’s national list introduces a Workplace Exposure Limit...
Bisphenol-A (BPA) has a new WEL of 2 mg/m³ (8-hour TWA). WES applies until 30 November 2026, then WEL applies when implemented. Exposure profile BPA may occur in resin, polycarbonate and epoxy manufacture, powder handling, bag emptying, blending, charging, milling, maintenance, labs and clean-down. Skin contact and sensitisation remain separate from airborne comparison. SEG and...
Respirable barium sulfate is a new WEL listing at 1.35 mg/m³ (8-hour TWA). Inhalable barium sulfate is separate; do not collapse fractions. WES applies until 30 November 2026, then WEL applies once implemented. Check your WHS regulator. Why PCBUs should act now Powder handling, bag cutting, hopper charging, milling, screening, fillers, plastics compounding, pack-out, damaged...
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