AS1940:2017 defines minor storage quantity limits - quantities below which reduced requirements apply and liquids may be stored on open shelves or work benches without a dedicated cabinet. Once those limits are exceeded, storage in a compliant AS1940 cabinet becomes mandatory.
The key minor storage thresholds for Class 3 flammable liquids stored indoors are:
| Environment | Packing Group I or II (e.g. petrol, acetone, toluene) | Packing Group III (e.g. kerosene, mineral turpentine) |
|---|---|---|
| Commercial / industrial buildings | 10 L per 50m² of floor area | 25 L per 50m² of floor area |
| Laboratories | 50 L per 50m² of floor area | 50 L per 50m² of floor area |
| Workshops | Approx. 1 L per 2m² (max 100 L) | Approx. 1 L per 2m² (max 100 L) |
If your stored quantity of flammable liquid exceeds the minor storage limit for your environment type, you are required to store those liquids in a cabinet that fully complies with AS1940. Even below the minor storage threshold, a compliant cabinet is strongly recommended as best practice - it significantly reduces fire risk and demonstrates a proactive duty of care under WHS legislation.
Note: Minor storage is not an exemption from all safety obligations. Controls around ignition sources, spill management, and emergency procedures still apply regardless of the quantity stored.