Filters - DIN Thread

DIN-thread filters

DIN 40 mm threaded filter cartridges — the universal connection standard used across most Australian and European reusable respirators. Cartridges in this range are cross-compatible with Maxiguard, CleanAir CA-5, and most other DIN-thread half-face and full-face respirators.

Filter classifications

• P-series (particulate): P1 (low-toxicity dust), P2 (silica, wood dust, welding fume, bacteria), P3 (asbestos, highly toxic particulate).
• A-series (organic vapour): A1 (light solvents), A2 (paint spray), A3 (heavy solvent exposure).
• B-series (inorganic gas): chlorine, chlorine dioxide, hydrogen sulphide (below permissible exposure limits).
• E-series (acid gas): sulphur dioxide, other acid gases.
• K-series (ammonia): ammonia and ammonia derivatives.
• ABEK: combined A+B+E+K for general multi-gas exposure.
• ABEK-P3: multi-gas plus particulate — the all-purpose workshop filter.
• Specialist: Hg (mercury), formaldehyde, and other scheduled-substance filters.

Filter capacity

The number after the letter (A1, A2, A3) indicates capacity. A higher number means a larger carbon bed and longer service life at the same concentration — not a higher protection level. Choose capacity based on expected exposure duration and concentration.

Particulate efficiency

• P1 — ≥80% efficiency.
• P2 — ≥94% efficiency.
• P3 — ≥99.95% efficiency.

Shelf life and storage

Sealed filters have a 3–5 year shelf life from manufacture date, marked on the packaging. Unopened storage in dry conditions. Once opened and installed on a mask, filter service life is use-driven — replace at breathing resistance increase (particulate), smell/taste breakthrough (gas), or at manufacturer's stated service time, whichever comes first.

Standards & compliance

All filters certified to AS/NZS 1716 with clear class marking on the cartridge and packaging. Selection must follow AS/NZS 1715 based on monitoring data for the relevant hazard.

Frequently asked questions

Can I mix filter brands on a single mask?

Physically yes — the DIN thread is universal. Operationally discouraged; stick to one brand within a respirator program to simplify compliance documentation and ensure consistent seal behaviour.

How long does a painting cartridge last?

Depends on spray density and ventilation. A2-P3 cartridges typically last a full day of controlled brush work, or 2–4 hours of heavy spray work. Replace on taste breakthrough or at the end of each major spray session.

Do ABEK filters cover solvent paint and 2-pack polyurethane?

ABEK covers most organic solvents used in acrylic and alkyd paints. For 2-pack polyurethane containing isocyanates, supplied air or PAPR is strongly recommended — isocyanate breakthrough on ABEK cartridges can be sudden and unpredictable.

Do you offer trade or bulk pricing?

Yes — trade accounts get 5% off RRP, and subscription programs for regular filter delivery are available. Apply for a trade account →