What hazard is hydrogen gas?
Hydrogen is a colorless gas with no odor. It is not toxic; the immediate health hazard is that it may cause thermal burns. It is flammable and may form mixtures with air that are flammable or explosive. Hydrogen may react violently if combined with oxidizers, such as air, oxygen, and halogens.
Is hydrogen a Category 1 flammable gas?
There are two categories for flammable gases: category 1 gases are those that are ignitable at 13% or less, by volume, in air with a flammable range of at least 12% (e.g., Hydrogen); all other flammable gases are assigned to category 2 (e.g., Ammonia).
What is the UN ID for hydrogen?
Chemical Identifiers
| CAS Number | UN/NA Number | DOT Hazard Label |
|---|---|---|
| 1333-74-0 | 1966 | Flammable Gas |
| NIOSH Pocket Guide | International Chem Safety Card | |
| none | HYDROGEN |
Is hazard identification on SDS?
Section 2: Hazard(s) Identification This section identifies the hazards of the chemical presented on the SDS and the appropriate warning information associated with those hazards.
What percentage of hydrogen is flammable?
4 percent to 74 percent
Hydrogen has a very broad flammability range—a 4 percent to 74 percent concentration in air and 4 percent to 94 percent in oxygen; therefore, keeping air or oxygen from mixing with hydrogen inside confined spaces is very important.
What is a Category 4 hazard?
Gases under pressure. 4 Groups include: Compressed gas, Liquefied gas, Dissolved gas, and Refrigerated liquefied gas. Flammable liquids. Categories 1 – 4. Flammable solids.
What is a Category 2 flammable gas?
Category 2 means Gases, other than those of Category 1, which, at 20°C (68°F) and a standard pressure of 101.3 kPa (14.7 psi), have a flammable range while mixed in air.
Is hydrogen gas flammable?
Hydrogen used in the fuel cells is a very flammable gas and can cause fires and explosions if it is not handled properly. Hydrogen is a colorless, odorless, and tasteless gas.
What is a Section 2 hazard identification?
Section 2 – Hazard(s) identification includes the hazards of the chemical and the appropriate warning information associated with those hazards. Section 3 – Composition/information on ingredients identifies the ingredient(s) contained in the product indicated on the SDS, including impurities and stabilizing additives.