![]() ![]() When used as a wood finish, linseed oil dries slowly and shrinks little upon hardening. The durability of putty is owed to the drying properties of linseed oil. ![]() Traditional glazing putty, consisting of a paste of chalk powder and linseed oil, is a sealant for glass windows that hardens within a few weeks of application and can then be painted over. The introduction of linseed oil was a significant advance in the technology of oil painting. It is available in varieties such as cold-pressed, alkali-refined, sun-bleached, sun-thickened, and polymerised (stand oil). It can also be used as a painting medium, making oil paints more fluid, transparent and glossy. Linseed oil is the carrier used in oil paint. WWII poster soliciting linseed oil for use in paint A can of French linseed oil. The water-repelling (hydrophobic) nature of the resulting hydrocarbon-based material is advantageous. Most applications of linseed oil exploit its drying properties, i.e., the initial material is liquid or at least pliable and the aged material is rigid but not brittle. In 1991, One Meridian Plaza, in Philadelphia, was severely damaged in a fire, in which three firefighters perished, thought to be caused by rags soaked with linseed oil. The oxidation of linseed oil is exothermic, which may lead to spontaneous combustion. Rags soaked with linseed oil stored pose fire hazard because they provide a large surface area for rapid oxidation. To prevent premature drying, linseed oil-based products (oil paints, putty) are stored in airtight containers. This polymerization, which is called " drying", results in the rigidification of the material. Having a high content of di- and tri-unsaturated esters, linseed oil is susceptible to polymerization reactions upon exposure to oxygen in air.
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