Respirators for Silica Dust: P2, P3 and Fit Testing Explained

Cut a concrete slab, chase a brick wall, grind a tile or drill into rock and you're making silica dust. The particles that do the damage are too fine to see, they hang in the air long after the job looks clean, and the lung diseases they cause don't show up for years. Once they do, they don't go away.

Good dust control on the tool does most of the work. But when a respirator is part of the plan, the wrong one, or the right one worn badly, gives you a false sense of safety. This guide covers what P1, P2 and P3 actually mean, which respirator types suit silica work, why fit testing matters, and what Victorian employers should have on their radar.

Where Silica Dust Turns Up

Crystalline silica is in most rock, sand and clay, which means it's in a lot of everyday building materials. Dust is generated whenever these are cut, ground, drilled, chased, polished, crushed or swept up dry:

• Concrete, cement, mortar and render
• Bricks, pavers, roof and floor tiles
• Natural stone such as granite and sandstone
• Fibre cement sheet
• Excavation, tunnelling and quarrying through rock
• Abrasive blasting and cleaning up silica-containing dust

If your crew is doing any of the above, assume silica is in the mix until you know otherwise.

P1, P2, P3: What the Classes Mean

In Australia, particulate respirators are classed P1, P2 or P3 based on how well the filter captures fine particles. Higher number, higher filter efficiency. The class is only half the story though. Real-world protection depends on the respirator type and how well it seals to the wearer's face.

Particulate filters stop dust, not gas or vapour. If the job also involves solvents, adhesives or chemical fumes, you need a combination cartridge with a gas filter as well.

Choosing the Respirator Type

Disposable P2 Respirators

Lightweight and low cost, suited to short or occasional tasks with lower dust levels. A valve makes breathing out easier and cuts heat build-up, which helps people keep them on. They're single-shift items. Once one is damp, damaged, hard to breathe through or won't seal, bin it.

Reusable Half-Face Respirators

A silicone or rubber facepiece with replaceable filters. Better for regular dust work: a more reliable seal than most disposables, more comfortable over a full shift, and cheaper per day once you're using them often. Filters are swapped as they load up, and the facepiece is cleaned and stored between uses.

Full-Face Respirators

Covers the eyes and face as well as the nose and mouth, gives a higher level of protection than a half mask when correctly fitted, and solves the fogged-glasses-over-a-mask problem. A common step up for heavier or longer dusty work.

Powered Air-Purifying Respirators (PAPR)

A battery-powered fan pushes filtered air into a hood, helmet or face shield. Cooler and easier to breathe in over a long shift, and loose-fitting hoods don't rely on a face seal, which makes them an option for workers who can't pass a fit test with a tight-fitting mask. Worth considering for full-day exposure or higher-dust tasks.

Fit Testing and Fit Checking

This is where most respirator programs fall over. The filter can be perfect and the mask still useless if air leaks in around the edges.

• Fit testing is a formal test, done by a competent person, that confirms a specific make, model and size of tight-fitting respirator seals on a specific person's face. AS/NZS 1715 sets out how respirators should be selected, fit tested, used and maintained. Tight-fitting respirators used for silica work should be fit tested to each wearer before use. Fit testing is commonly repeated annually, and again whenever the model changes or the wearer's face changes (weight change, dental work, scarring).
• Fit checking is the quick seal check the wearer does every time they put it on. Cover the filter or mask, breathe in and out gently, and feel for leaks. If it leaks, adjust it or swap it before starting work.
• Facial hair breaks the seal. Anyone wearing a tight-fitting respirator needs to be clean shaven where the mask meets the face. If that isn't going to happen, a loose-fitting PAPR hood is the realistic alternative.
• Sizes matter. One size rarely fits a whole crew. Stock small, medium and large in whatever model you standardise on.

What Victorian Employers Should Know

In Victoria, silica work is covered by the Occupational Health and Safety Act 2004 and the Occupational Health and Safety Regulations 2017, which include a dedicated part on crystalline silica. Victoria runs its own OHS framework rather than the harmonised WHS laws used in most other states, so national guidance is a useful reference but it isn't the Victorian rulebook. A few points worth having on your radar:

• Engineered stone has been banned across Australia since 1 July 2024, but silica controls still apply to every other silica-containing material: concrete, brick, tile, natural stone and fibre cement.
• Under the Victorian regulations, respiratory protective equipment for silica work must comply with AS/NZS 1716, the Australian standard for respiratory protective devices, or equivalent requirements. Look for the AS/NZS 1716 mark on the packaging, and ask your supplier for certification details if it isn't shown.
• Work defined as high risk crystalline silica work needs a written crystalline silica hazard control statement before it starts.
• WorkSafe's construction guidance centres on controlling dust at the tool, through water suppression and on-tool extraction, backed by air monitoring and respirator use. A mask on its own isn't the plan.

For the detail that applies to your work, go straight to WorkSafe Victoria's crystalline silica guidance.

A Respirator Is the Last Layer

Respirators protect the person wearing them, and only while they're wearing them correctly. The controls that actually reduce the dust in the air come first:

• Choose lower-silica materials or methods that don't create dust where you can
• Use water suppression or on-tool dust extraction on cutting, grinding and chasing tools
• Clean up with a suitable industrial vacuum or wet methods, never dry sweeping or compressed air
• Keep other people out of the dust zone and limit time spent on dusty tasks

PPE backs those controls up. It doesn't replace them.

Quick Checklist

1. Identify every task that cuts, grinds, drills or disturbs silica-containing material.
2. Put dust controls on the tool first. Respirators back them up.
3. Use P2 as the minimum, and step up to full-face or PAPR for higher-dust or longer tasks.
4. Look for the AS/NZS 1716 mark on any respirator you buy.
5. Fit test tight-fitting respirators to each wearer, and teach the quick fit check.
6. Keep the seal area clean shaven, or provide a loose-fitting PAPR hood.
7. Stock multiple sizes and spare filters so nobody makes do.
8. Replace disposables every shift and filters when breathing gets harder.

Related reading: Welding PPE Explained covers fume and respiratory protection for welders, and our Complete Guide to Workplace PPE in Australia covers every category.