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THE
ORCBS > Hazardous
Waste > Programs & Guidelines > Waste Disposal Guide >
 N.O.S.
Marking (Not Otherwise Specified)
Some chemical waste offered for disposal may have to be identified under one of the N.O.S. (not otherwsie specified) shipping names indexed in the Hazardous Materials Table (Appendix G). This is due to practical considerations which prohibit listing all dangerous materials by name, and the fact that new chemical products are introduced annually, allowing only periodic updating of the chemical indexes. If the hazard class of the waste is known and that waste is not listed by name in the Hazardous Materials Table, then an N.O.S. shipping name must be assigned.
If a proper shipping name is listed on the manifest by an N.O.S. entry (i.e., Flammable Liquid N.O.S.), the entry does not provide sufficient information about the material to ensure that appropriate action be taken in the event of an accident. For this reason, it is necessary that these N.O.S. descriptions be supplemented with the technical name of the material(s).
Chemical Compatibility
Accidental mixing of one hazardous waste with another may result in a vigorous and dangerous chemical reaction. Generation of toxic gases, heat, possible overflow or rupturing of receptacles, fire, and even explosions are possible consequences of such reactions.
The Chemical Compatibility Chart (Appendix C), shows chemical combinations believed to be dangerously reactive in the case of accidental mixing. The chart provides a broad grouping of chemicals with an extensive variety of possible binary combinations.
Generally speaking, an “X” on the chart indicates where one group can be considered dangerously reactive with another group. However, there may be some combination between the groups that would not be dangerously reactive; therefore, the chart should not be used as an infallible guide.
The following procedure explains how the chart should be used in determining compatible information.
- Determine the reactivity group of a particular waste.
- Enter the chart with the reactivity group that forms an unsafe combination with the chemical in question.
For example, crotonaldehyde is an aldehyde in group 19. The chart shows that chemicals in this group should be segregated from sulfuric acid and nitric acids, caustics, ammonia and all types of amines (aliphatic, alkanol, and aromatic). According to note A, crotonaldehyde is also incompatible with nonoxidizing mineral acids.
Appendix C. Compatibility Table
Disposal
Of Unknowns
Waste
Disposal Guide Table of Contents
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