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Related to pyrophoric: Pyrophoric iron, Organic peroxide


1. Spontaneously igniting in air.
2. Producing sparks by friction.

[From pyrophorus, substance that ignites spontaneously : from Greek purophoros, fire-bearing : puro-, pyro- + -phoros, -phorous.]


(ˌpaɪrəʊˈfɒrɪk) or


1. (Chemistry) (of a chemical) igniting spontaneously on contact with air
2. (General Physics) (of an alloy) producing sparks when struck or scraped: lighter flints are made of pyrophoric alloy.
[C19: from New Latin pyrophorus, from Greek purophoros fire-bearing, from pur fire + pherein to bear]


(ˌpaɪ rəˈfɔr ɪk, -ˈfɒr-)

capable of igniting spontaneously in air.
[1830–40; < Greek pyrophór(os) fire-bearing]
References in periodicals archive ?
RIYADH: Saudi Aramco's Haradh Gas Plant has pioneered the use of Concrete Canvas (CC) in the construction of a pyrophoric treatment area, the works for which were carried out by Saudi-based Freih Bin Owaidha Al Qahtani Sons Co Ltd (FOQSCO).
A chemical that is pyrophoric (UN GHS Hazard H250) is also a flammable liquid (UN GHS Hazard H228).
These materials are pyrophoric, ie these react very violently with the oxygen in the air, so that fire phenomena occur.
Open flames and pyrophoric chemicals expose laboratory workers to high risk potentials, and the handling of toxic, corrosive or flammable liquids is routine.
Pyrophoric materials are substances which have an auto ignition temperature which is below room temperature.
Pyrophoric substances such as iron sulfide auto-ignite in the presence of oxygen in an extremely exothermic reaction.
Some include enhancements such as additional fragmentation or pyrophoric, chemical, biological, and radiological materials, which increase the bomb's lethality or its explosive, incendiary, or psychological effect.
New additions under COMAH and CLP include pyrophoric liquids and solids and flammable aerosols.
Fire Investigator Mark Whitaker said: "It's called pyrophoric action and is a rare thing, but it's not impossible.
It was determined that R-40 was very chemically reactive with aluminum inside the refrigeration system and produced a violent reaction forming toxic and reactive compounds, some of which could be pyrophoric (spontaneously combust in the presence of air).