A semi-drying oil is an
oil
An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated ...
which partially hardens when it is exposed to air. This is as opposed to a
drying oil
A drying oil is an oil that hardens to a tough, solid film after a period of exposure to air, at room temperature. The oil hardens through a chemical reaction in which the components crosslink (and hence, polymerize) by the action of oxygen (not ...
,
which hardens completely, or a
non-drying oil
A non-drying oil is an oil which does not harden and remains liquid when it is exposed to air. This is as opposed to a drying oil, which hardens (through polymerization) completely, or a semi-drying oil, which partially hardens. Oils with an iodi ...
, which does not harden at all. Oils with an
iodine number
Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...
of 115–130 are considered semi-drying.
Examples of semi-drying oils
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Corn oil
Corn oil (North American) or maize oil (British) is oil extracted from the germ of corn (maize). Its main use is in cooking, where its high smoke point makes refined corn oil a valuable frying oil. It is also a key ingredient in some margarines. ...
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Cottonseed oil
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Sesame oil
Sesame oil is an edible vegetable oil derived from sesame seeds. The oil is one of the earliest-known crop-based oils. Worldwide mass modern production is limited due to the inefficient manual harvesting process required to extract the oil. O ...
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Grape seed oil
Grape seed oil (also called grapeseed oil or grape oil) is a vegetable oil derived from the seeds of grapes. A by-product of the winemaking industry, it is typically used for edible applications.
Uses
Cooking
Grape seed oil has a moderatel ...
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Sunflower oil
Sunflower oil is the non-volatile oil pressed from the seeds of the sunflower (''Helianthus annuus''). Sunflower oil is commonly used in food as a frying oil, and in cosmetic formulations as an emollient.
Sunflower oil is primarily composed ...
See also
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Painting oil
Oil paint is a type of slow-drying paint that consists of particles of pigment suspended in a drying oil, commonly linseed oil. The viscosity of the paint may be modified by the addition of a solvent such as turpentine or white spirit, and va ...
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Seasoning cast iron
References
{{DEFAULTSORT:Semi-Drying Oil
Visual arts materials
Painting materials
Oils