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UPVC WINDOWS OXFORD

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History Oxford was first occupied in Saxon times, and was initially known as "Oxenaforda", meaning "Ford of the Ox"; fords being very important before the days of bridges.[1] It began with the foundation of St Frideswide's nunnery in the 8th century, and was first mentioned in written records in the Anglo-Saxon Chronicle for the year 912. In the 10th century Oxford became an important military frontier town between the kingdoms of Mercia and Wessex and was on several occasions raided by Danes. St Frideswide is the patron saint of both the city and university. In 1191, a city charter stated in Latin[2]: “Be it known to all those present and future that we, the citizens of Oxford of the Commune of the City and of the Merchant Guild have given, and by this, our present charter, confirm the donation of the island of Midney with all those things pertaining to it, to the Church of St. Mary at Oseney and to the canons serving God in that place. “Since, every year, at Michaelmas the said canons render half a mark of silver for their tenure at the time when we have ordered it as witnesses the legal deed of our ancestors which they made concerning the gift of this same island; and besides, because we have undertaken on our own part and on behalf of our heirs to guarantee the aforesaid island to the same canons wheresoever and against all men; they themselves, by this guarantee, will pay to us and our heirs each year at Easter another half mark which we have demanded; and we and our heirs faithfully will guarantee the aforesaid tenement to them for the service of the aforesaid mark annually for all matters and all services. “We have made this concession and confirmation in the Common council of the City and we have confirmed it with our common seal. These are those who have made this concession and confirmation.”

History Polyvinyl chloride was accidentally discovered on at least two different occasions in the 19th century, first in 1835 by Henri Victor Regnault and in 1872 by Eugen Baumann. On both occasions, the polymer appeared as a white solid inside flasks of vinyl chloride that had been left exposed to sunlight. In the early 20th century, the Russian chemist Ivan Ostromislensky and Fritz Klatte of the German chemical company Griesheim-Elektron both attempted to use PVC (polyvinyl chloride) in commercial products, but difficulties in processing the rigid, sometimes brittle polymer blocked their efforts. In 1926, Waldo Semon and the B.F. Goodrich Company developed a method to plasticize PVC by blending it with various additives. The result was a more flexible and more easily-processed material that soon achieved widespread commercial use.

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