fire diamond
Chemical danger sign
A fire diamond is the diamond-shaped hazard warning sign displayed on chemical containers and storage tanks, divided into four colored sections indicating health hazard (blue), flammability (red), reactivity (yellow), and special hazards (white).
Each section contains a number from 0 to 4 rating the severity of risk.
Formally called the NFPA 704 diamond after the National Fire Protection Association standard.
The fire diamond on the tank showed a 4 for flammability.
Notice on a board
- color codedMarked by different hues
- hazmatToxic materials needing precautions
- warning signIndicator of potential danger
- emergency responseOrganized action during crises
Ignition temperature threshold
- combustibleCapable of burning
- flammableProne to ignition
- inflammableAble to catch fire
- ignitionStarting combustion process
burnable · spontaneous combustion · autoignition · burn rate · fuel load · ignition source
Prone to sudden change
- reactiveTending to respond
- oxidizerElectron-accepting reactant
- explosiveProne to sudden detonation
- polymerizationMonomers bonding into chains
Capacity to cause harm
- poisonousCapable of causing death
- carcinogenCancer-promoting agent
- irritantSource of vexation
- asphyxiantGas blocking oxygen access
neurotoxin · exposure · health hazard · teratogen · mutagen · allergen · respiratory · skin contact
Electron-accepting reactant
- asphyxiantGas blocking oxygen access
- corrosiveDestroys by chemical action
- acidLow-pH chemical compound
- alkaliAcid-neutralizing ionic compound
radioactive · biohazard · cryogenic · RAD
placard
Notice on a board
- color codedMarked by different hues
- hazmatToxic materials needing precautions
- warning signIndicator of potential danger
flashpoint
Ignition temperature threshold
- combustibleCapable of burning
- flammableProne to ignition
- inflammableAble to catch fire
ignition · burnable · spontaneous combustion · autoignition · burn rate · fuel load · ignition source
unstable
Prone to sudden change
polymerization · decomposition · incompatibility · exothermic · detonation
toxicity
Capacity to cause harm
- poisonousCapable of causing death
- carcinogenCancer-promoting agent
- irritantSource of vexation
asphyxiant · neurotoxin · exposure · health hazard · teratogen · mutagen · allergen · respiratory · skin contact · ingestion
oxidizer
Electron-accepting reactant
- asphyxiantGas blocking oxygen access
- corrosiveDestroys by chemical action
- acidLow-pH chemical compound
alkali · radioactive · biohazard · cryogenic · RAD