Pyrophoric material

Requirements for pyrophoric materials storage are covered or referenced in UFC Section 8003.8. Included are requirements for signage, ignition control, spill control, drainage, secondary containment, ventilation, separation from incompatibles, fire protection, explosion control, electrical reliability requirements, and alarm/monitoring requirements. 

Cleanrooms utilize several types of air handling systems to create the desired controlled environment  

Each of these systems must be properly coordinated with the other to ensure a safe occupancy is provided for people and the physical assets. The UBC and UFC stipulate requirements for ventilation rates, separation of air streams, and the relationships between each system. The Uniform Mechanical Code (UMC) provides additional technical requirements. When the operations in the cleanroom utilize hazardous materials, the HVAC systems are a vital element in the code-mandated life safety package. 

---

L. R. Kehnan, W. D. Wilkinson, A. B. Shuck, and R. C. Goert2, The Safe Handling ofRadioactire Pyrophoric Materials ANL-5509, Argonne National Laboratory, Argonne, lU., 1955. 

Ingress of air into reactor containing pyrophoric material. Possibility of fire / deflagration. 

Pyrophoric material exposed to air when equipment is opened for clean-ing/maintenance. Possibility of fire and operator exposure. 

Spontaneous combustion of pyrophoric material in the filter after opening or blowing dry. 

There are no pyrophoric materials such as peroxides, acetylides or sulfides, or other internal ignition possibilities such as static present, either normally or through abnormal conditions. 

Chemical reaction sources catalysis, reaction with powerful oxidants, reaction of metals with halocarhons, thermite reaction, thermally unstahle materials, accumulation of unstahle materials, pyrophoric materials, polymerization, decomposition, heat of adsorption, water reactive solids, incompatihle materials. 

Location and General Requirements. Locations shall be classified depending on the properties of the flammable vapors, liquids or gases or combustible dusts or fibers that may be present and the likelihood that a flammable or combustible concentration or quantity is present. Where pyrophoric materials are the only materials used or handled, these locations shall not be classified. 

Inorganic oxides are usually prepd by intimate contact between the element and oxygen or air. The reaction may be rapid and exothermic, as when finely divided pyrophoric materials ignite spontaneously in air or oxygen. Examples of these materials are iron, lead and phosphorus.-Or, the reaction may be slow as when iron oxidizes when exposed to ordinary moist air, or when aluminum oxidizes at the surface upon exposure to air. Much of the time oxidation re-... 

Pyrophoric materials Reaction rate/heat Electrical switches and Vapor cloud explosions... 

See Furfuryl alcohol Acids See other pyrophoric materials... 

See Other METAL CYANIDES (AND CYANO COMPLEXES), PYROPHORIC MATERIALS... 

See related PYROPHORIC MATERIALS See other SILVER COMPOUNDS 2888. Isophthalovl chloride... 

On warming, or on treatment with ether, the solvated complex give a black pyrophoric material of unknown constitution. 

It is pyrophoric in ambient air when finely divided. See other metal sulfides, pyrophoric materials... 

See Other METAL HALIDES, PYROPHORIC MATERIALS, REDUCANTS... 

---