| LAB |
| See linear alkylbenzene (LAB). |
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| LAS |
| See anionic surfactants (LAS). |
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| latex (pl. latices) |
| A water emulsion of a synthetic rubber or plastic obtained by polymerisation and used especially in coatings, paints and adhesives. Latices include a binder dispersed in the water and form films by fusion of the plastic particles as the water evaporates. Properties of these films, such as hardness, flexibility, toughness, adhesion, colour retention, and resistance to chemicals, depend on the composition of the plastic. |
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| LC50 |
| Median Lethal Concentration. A statistically derived concentration that can be expected to cause death in 50% of animals exposed for a specific time. |
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| LCA |
Life Cycle Assessment.
ALSO: Life Cycle Analysis. |
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| LCI |
| Life Cycle Inventory. |
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| LCP |
| Large Combustion Plant. |
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| LCPD |
| Large Combustion Plant Directive. |
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| LD50 |
| Median Lethal Dose. Statistically derived single dose that can be expected to cause death in 50% of dosed animals. |
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| LDPE |
| See low-density polyethylene (LDPE). |
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| LEL |
Lower Explosive Limit of a flammable material. See explosive limits.
ALSO: LFL (Lower Flammable Limit). |
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| LERC |
| Local Emergency Response Commission (USA). |
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| LEV |
| Local Exhaust Ventilation. |
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| LFL |
Lower Flammable Limit of a flammable material. See explosive limits.
ALSO: LEL (Lower Explosive Limit). |
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| LH |
| See luteinising hormone (LH). |
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| linear alkylbenzene (LAB) |
| Linear alkylbenzene (LAB), the material used to produce LAS, is derived exclusively from petroleum bi-products - benzene and paraffins derived from kerosene. It is a component of laundry detergents and other cleaning products that was created to help put an end to foaming in rivers and streams. Because of its environmental safety, it is used by many companies and consumers around the world. |
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| linear low-density polyethylene (LLDPE) |
| A plastic that is used predominantly in film applications due to its toughness, flexibility and relative transparency. LLDPE is the preferred resin for injection moulding because of its superior toughness and is used in items such as grocery bags and garbage bags. |
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| Liquefied Petroleum Gas (LPG) |
| See Liquid Petroleum Gas (LPG/LP gas). |
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| Liquid Petroleum Gas (LPG/LP gas) |
Ethane, ethylene, propane, propylene, normal butane, butylene, and isobutane produced at refineries or natural gas processing plants, including plants that fractionate new natural gas plant liquids.
ALSO: Liquefied Petroleum Gas. |
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| LLDPE |
| See linear low-density polyethylene (LLDPE). |
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