Soda Blasting SWMS

Soda blasting is a low-abrasion media blasting technique using sodium bicarbonate propelled by compressed air to strip coatings, corrosion, soot or contaminants from substrates without damaging the underlying material. It is widely used across restoration, heritage conservation, marine maintenance, automotive refurbishment and corrosion-preparation works on structural steel, masonry and concrete. Although softer than silica or garnet abrasives, soda blasting still generates respirable dust clouds, high-velocity media rebound, elevated noise levels above 85 dB(A) and significant skin and eye exposure risks. Under WHS Regulation 2011 r291 and the equivalent harmonised 2025 provisions, abrasive blasting is classified as High Risk Construction Work when performed on a construction site, triggering a mandatory Safe Work Method Statement before work commences. The SWMS must identify hazards, document the hierarchy of controls, confirm worker consultation and be available for inspection by the regulator. This template provides a CIH-reviewed, editable framework compliant across all eight Australian jurisdictions.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where feasible, substitute soda blasting with chemical stripping, hand-tool removal or ultra-high-pressure water jetting to eliminate airborne abrasive dust entirely.
2. 2Elimination — Remove all non-essential personnel from the blast exclusion zone using a minimum 10 metre hard-barricaded perimeter with signage and spotter control.
3. 3Substitution — Where coating type permits, substitute dry soda blasting with wet/slurry soda blasting to suppress dust generation by 80–90% at the source.
4. 4Engineering — Conduct works inside a purpose-built blast enclosure or containment tent with HEPA-filtered negative-pressure extraction maintaining minimum 4 air changes per hour.
5. 5Engineering — Use deadman-controlled blast nozzles with automatic shut-off, whip-check restraints on every coupling, and pressure-rated hose tested to AS 1869.
6. 6Administrative — Pre-task sample legacy coatings for lead, chromate and asbestos per AS 4361.1 before disturbance; classify and manage hazardous dust accordingly.
7. 7Administrative — Implement a permit-to-work system, daily pre-start toolbox talks, rotation schedule limiting continuous blasting to 45-minute cycles, and exposure monitoring records.
8. 8Administrative — Provide training and competency verification per AS/NZS 4801 for all blast operators, pot tenders and supervisors before first use.
9. 9PPE — Supplied-air abrasive blasting helmet meeting AS/NZS 1716 with Class CE airline respirator, full blast suit, leather gauntlets and steel-capped boots.
10. 10PPE — Hearing protection rated SLC80 26+ dB, impact-rated safety eyewear under the hood, and barrier cream on exposed skin to mitigate alkaline irritation.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a heritage sandstone facade restoration in a CBD precinct, the blast crew assembles at 06:30 for the pre-start brief. The supervisor opens the Soda Blasting SWMS on a tablet and walks the three-person crew through each identified hazard, starting with respirable dust and confirming the building's 1962 construction date triggers the AS 4361.1 lead-testing protocol. Swab samples taken the previous day returned positive for lead at 0.4%, so the crew confirms the containment tent is sealed, negative-pressure extraction is running, and supplied-air helmets are connected to the filtered compressor located upwind. The pot tender signs on as the deadman controller and verifies whip-checks on every hose coupling. Each operator signs the SWMS sign-on register acknowledging they have been trained, fit-tested, and understand the 45-minute rotation cycle. Two hours into the shift, ambient temperature rises faster than forecast and one operator reports early heat stress symptoms. The supervisor pauses work, refers back to the heat stress control in the SWMS, shortens the rotation to 30 minutes, increases hydration breaks, and annotates the change on the live SWMS as a documented amendment. The crew re-signs the updated version before resuming, demonstrating the SWMS functioning as a living field document rather than a filed-and-forgotten compliance record.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing Risks of Hazardous Chemicals CoP; Construction Work CoP

Frequently asked questions