Perclean® is a trade name for perchloroethylene or Perc , or more specifically tetrachloroethylene (CAS Number ). Thus, the most effective search of computerized databases is conducted using tetrachloroethylene and/or CAS Number .
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The chemical composition information should be based on an analysis of the final or technical product. A technical grade product is not usually a pure substance and often contains other chemicals such as stabilizers, solvents, carriers, “inert” ingredients, or impurities. For the hazard evaluation process, these other chemicals must also be listed if they are more than 1.0% of the composition for non-carcinogenic substances or 0.1% of the product if the substance is a carcinogen. Correct identification of chemicals is critical for data retrieval. Use the precise chemical name and CAS number when searching for information.
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- A mixture will not be categorized as a combustible liquid so long as less than 1% of the total volume of components have flashpoints between 100º and 200ºF.
- Moisture in the air often increases the probability of spontaneous ignition of pyrophoric materials.
- Many mixtures will contain more than 1% of a flammable liquid and the mixture will have a flashpoint above 100ºF.
- Many of these are elements (e.g. , lithium, powdered aluminum, magnesium) or organometallic compounds .
A problem with the use of common names or abbreviations is that they may be used for more than one molecular entity. For example, TCE is sometimes used as an acronym for tetrachloroethylene, although it more frequently refers to trichloroethylene. To avoid confusion, literature is often indexed using the CAS number or the primary chemical name. An example of the type of chemical identification data that is needed is presented for Perclene®, a widely used industrial solvent.
Because this document can only present a limited discussion of the various hazards, you are encouraged to consult references that go into greater detail . Most toxicity and epidemiology reports will provide an analysis of the data and discover more conclude whether the results were positive or negative, or will describe the adverse effects observed at specific dose levels. Positive results mean that the exposed humans or animals were more likely to develop toxic effects than the non-exposed population.
The other major measure of statistical significance is the 95% confidence level for a specific data point. Most reports of toxicity testing will include some information on the confidence in the data. There are three key criteria that must be met, namely “statistically significant”, “positive study”, and “established scientific principles”. Thus, the evaluation of study results requires some knowledge of statistics, commonly accepted scientific test methodology, and the definitions of health hazards. The percent composition should be available in-house for all chemicals and products manufactured or imported.