Flammable solids pyrophoric

CONSENSUS REPORTS Reported in EPA TSCA InventorjL ACGIH TLV TWA 2 mg(Al)/m3 SAFETY PROFILE Pyrophoric, moisture-sensitive, flammable solid. Danger from spontaneous combustion. When heated to decomposition it emits toxic fumes of Al. 

This section contains a number of regulations aimed at specifically identified substances (e.g., in Subpart D, fiammable, combustible, and pyrophoric liquids in Subpart E, flammable solids, oxidizers, and organic peroxides) and must be consulted by any shipper subject to EPA s pretransport regulation. 

Hazard Class 4 is composed of flammable solids. Additionally, some pyrophoric and water-reactive liquids are included under the 4.2 Spontaneously Combustible and... 

Chapter 6 Flammable Solids Class 4.1 Flammable Solids Flash-Point Solids/Snblimation Combnstible Dnsts Class 4.2 Spontaneons Combnstibles Spontaneons Ignition Pyrophoric Solids and Liqnids Incidents... 

Inflammability or Flammability (latter is preferred in modern usage). The ease with which a material (gas, liquid or solid) will ignite, either spontaneously (pyrophoric), from exposure to a high-temperature environment (autoignition), or to a spark or open flame. It also involves the rate of spreading of a flame once it has started. The more readily ignition occurs, the more flammable the material less easily ignited materials are said to be combustible, but the line of demarcation is often indefinite, and depends on the state of subdivision of the material as well as on its chemical nature... 

PYROPHORIC MATERIAL. Any liquid or solid that will ignite spontaneously in air at about 130F (54.4C). Titanium dichloride and phosphorus are examples of pyrophoric solids tnbutylaluminum and related compounds are pyrophoric liquids. Sodium, butyLithium, and lithium hydride are spontaneously flammable in moist air because they react exothermically with water, Such materials must be stored in an atmosphere of inert gas or under kerosene. Some alloys (barium, misch metal) are called pyrophoric because they spark when slight friclion is applied. 

Cleaning Up Spread the zinc out on a watch glass for about 20 min before wetting it and placing it in the nonhazardous solid waste container. Sometimes zinc dust from a reaction like this is pyrophoric (spontaneously flammable in air) because it is so finely divided and has such a large, clean surface area able to react with air. The aqueous filtrate should be neutralized with sodium carbonate, zinc salts removed by vacuum filtration, and the filtrate diluted with water and flushed down the drain. The zinc salts are placed in the nonhazardous solid waste container. The filtrate from the fractional crystallization should all be placed in the organic solvents container. Allow the solvent to evaporate from the sodium sulfate in the hood and then place it in the nonhazardous solid waste container. 

---