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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 12: Material Safety: a Personal and Technical Report on Hazardous Material Handling
      9  Reading and Understanding MSDSs

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Hazard Ratings
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Section Six - Health Hazard Data
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Section Five - Reactivity Data

Figure 414: MSDS Section Five: Reactivity Data

 


This section describes the possible hazardous reactions of the substance that may occur, the conditions and materials that may facilitate or trigger these reactions, conditions and materials that should be avoided and what hazardous byproducts may form from the decomposition of the product.

In the arena of workplace safety, a hazardous reaction may be loosely defined as the sudden and often unexpected, change in a substance’s physical state (solid, liquid, gas) temperature, density, volume, and/or chemical structure.

Hazardous reactions present a serious danger to workers if the possible reactions are not recognized and controlled. Fires, explosions, the production and/or release of toxic or dangerous substances, and the depletion or displacement of oxygen are just a few of the perilous consequences of hazardous reactions that have gone astray. Sometimes, unfortunately, the results of such incidents are employee injuries and fatalities.

The chemical reaction called polymerization is when smaller molecules (monomers) join to form a larger molecule (polymer). This type of reaction usually produces heat and pressure. Many substances can readily undergo polymerization when exposed to temperature increases, sunlight, ultraviolet (UV) radiation, X-rays or if they make contact with incompatible chemicals.

Hazardous polymerization is the uncontrolled occurrence of this type reaction. Once started, the heat that it produces often accelerates the reaction. The uncontrolled buildup of heat and pressure can cause a fire or an explosion, or rupture closed containers.


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Hazard Ratings
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Section Six - Health Hazard Data
Next Topic/Section

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