Hazardous Products Regulations — 7.2.1
Exclusions — aerosols 7.2.1 (1) Any product that is classified in a category of the hazard class “Aerosols” need not be classified in any category or subcategory of this hazard class. Exclusions — chemicals under pressure (1.1) Any product that is classified in a category of the hazard class “Chemicals Under Pressure” must not be classified in any category or subcategory of this hazard class. Categories — flammable gas (2) A flammable gas is classified in a category or subcategory of this hazard class in accordance with the following table: TABLE Column 1 Column 2 Column 3 Item Category Subcategory Criteria 1 Flammable Gases — Category 1A, Flammable Gas A flammable gas that (a) is ignitable when mixed with air at a concentration ≤ 13.0% by volume; or (b) has a flammable range when mixed with air ≥ 12 percentage points, regardless of the lower flammability limit, unless data demonstrate it meets the criteria for the subcategory “Flammable Gases — Category 1B, Flammable Gas” 2 Flammable Gases — Category 1B, Flammable Gas A flammable gas that meets the criteria for the subcategory “Flammable Gases — Category 1A, Flammable Gas”, but does not meet the criteria for the subcategory “Flammable Gases — Category 1A, Pyrophoric Gas”, “Flammable Gases — Category 1A, Chemically Unstable Gas A” or “Flammable Gases — Category 1A, Chemically Unstable Gas B”, and that has (a) a lower flammability limit of > 6.0% by volume in air; or (b) a fundamental burning velocity < 10 cm/s 3 Flammable Gases — Category 2, Flammable Gas A flammable gas that does not meet the criteria for the subcategory “Flammable Gases — Category 1A, Flammable Gas” or “Flammable Gases — Category 1B, Flammable Gas” Subcategories — chemically unstable gas (2.1) A chemically unstable gas is classified in a subcategory of this hazard class in accordance with the following table: TABLE Column 1 Column 2 Item Subcategory Criteria 1 Flammable Gases — Category 1A, Chemically Unstable Gas A A flammable gas that, at 20°C and at the standard pressure of 101.3 kPa, is a chemically unstable gas 2 Flammable Gases — Category 1A, Chemically Unstable Gas B A flammable gas that, at > 20°C or at a pressure > 101.3 kPa, is a chemically unstable gas Subcategory — pyrophoric gas (2.2) A pyrophoric gas is classified in the subcategory of this hazard class in accordance with the following table: TABLE Column 1 Column 2 Item Subcategory Criteria 1 Flammable Gases — Category 1A, Pyrophoric Gas A flammable gas that is a pyrophoric gas Calculation method (3) Test data have priority over data obtained using a calculation method. If a calculation method is used to establish whether a gas is classified in this hazard class, the calculation method set out in the International Organization for Standardization standard ISO 10156:2017 entitled Gas cylinders — Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets , as amended from time to time, or any other calculation method that is a scientifically validated method, must be used. Data permits classification in category or subcategory (4) If the data obtained using a calculation method referred to in subsection (3) support the conclusion that the gas must be classified in a category or subcategory of this hazard class in accordance with the tables following subsection 7.2.1(2), (2.1) or (2.2), the gas must be classified in the appropriate category or subcategory. Data does not permit classification in category or subcategory (5) If the data obtained using a calculation method referred to in subsection (3) support the conclusion that the gas is a flammable gas, but do not permit for the determination of classification in the appropriate category or subcategory of this hazard class, the gas must be classified in the subcategory “Flammable Gases – Category 1A, Flammable Gas”. SOR/2022-272, s. 20