| N.O.S. |
| See Not Otherwise Specified (N.O.S.). |
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| NA |
| National Associations. |
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| NAB |
| National Associations Board (Cefic). |
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| NACE |
| Nomenclature of the Activities of the European Communities. |
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| NADWC |
| National Association of Waste Disposal Contractors (UK). |
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| NAFTA |
| North American Free Trade Agreement. |
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| naphtha |
| Petroleum naphtha is a petroleum distillate containing principally aliphatic hydrocarbons. It is the primary source from which petrochemicals are derived. |
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| NAS |
| National Academy of Sciences (USA). |
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| natural chlorine compounds |
| Chlorine is one of the elements most frequently found in nature; it is even more abundant than carbon. Chlorides, i.e. salts containing chlorine, are one of the few raw materials which will not be exhausted within the foreseeable future, even if chlorine consumption were to increase. Naturally-occurring chlorine compounds are present in our blood, skin and teeth, and chlorine in the form of hydrochloric acid has an important part to play in the digestive process. There are also organic compounds present in nature which contain chlorine; marine algae, for example, produce about 5 million tons of methyl chloride annually (ie: circa 15 times more than yearly industrial production). In total, more than 2000 natural organic chlorine compounds have already been identified. |
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| natural gas |
| Colourless, highly flammable gaseous hydrocarbon consisting primarily of methane, ethane, and small amounts of heavier gaseous hydrocarbon compounds such as propane. Ethane and propane, also called natural gas liquids (NGL), are converted into ethylene and propylene by steam cracking. It is a type of petroleum that commonly occurs in association with crude oil. |
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| NBR |
| See nitrile-butadiene-rubber (NBR). |
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| n-butane |
| See butane. |
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| NCD |
| New Chemicals Database (REACH Regulation). |
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| NCI |
| National Cancer Institute (USA). |
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| NCP |
| National Contact Point (as for EEC activity on EINECS). |
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| NDSL |
| Non-Domestic Substances List (set up under the Canadian Environmental Protection Act). |
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| NEL |
| No-effect Level. |
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| NEPA |
| National Environmental Protection Agency (China). |
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| NERC |
| National Environmental Research Council (UK). |
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| NESHAP |
| National Emission Standard for Hazardous Air Pollutants (USA). |
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B
