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Neoprene's burn point is around 260 °C (500 °F). [21] In its native state, neoprene is a very pliable rubber-like material with insulating properties similar to rubber or other solid plastics. Neoprene foam is used in many applications and is produced in either closed-cell or open-cell form.
The Book of the Dead of Hunefer, c. 1275 BCE, ink and pigments on papyrus, in the British Museum (London). After extracting the marrow from the stems of papyrus reed, a series of steps (humidification, pressing, drying, gluing, and cutting) produced media of variable quality, the best being used for sacred writing. [10]
The oldest known paper document in Europe is the Mozarab Missal of Silos from the 11th century, [73] probably using paper made in the Islamic part of the Iberian Peninsula. They used hemp and linen rags as a source of fiber.
Parkesine, the first member of the Celluloid class of compounds and considered the first man-made plastic, is patented by Alexander Parkes. [4] 1869: John Wesley Hyatt discovers a method to simplify the production of celluloid, making industrial production possible. 1872: PVC was accidentally synthesized in 1872 by German chemist Eugen Baumann ...
Carothers invented neoprene, a synthetic rubber; [16] the first polyester superpolymer; and, in 1935, nylon. The invention of Teflon followed a few years later and has since been proven responsible for health problems in those exposed to the chemical through manufacturing and home use. [17] DuPont introduced phenothiazine as an insecticide in ...
Although it may have been discovered earlier, chloroprene was largely developed by DuPont during the early 1930s, specifically with the formation of neoprene in mind. [4] The chemists Elmer K. Bolton , Wallace Carothers , Arnold Collins and Ira Williams are generally accredited with its development and commercialisation although the work was ...
The first printed book in Romania is made in 1508, Liturghierul. Octoihul is also printed in 1510, and Evangheliarul is printed in 1512 [56] 1534 Brașov: Johannes Honterus: At the time, the city was a part of the Eastern Hungarian Kingdom. 1545 Târgoviște: Dimitrije Ljubavić: Mostly religious books are printed, among them being Molitvenik. [57]
The earliest form of notebook was the wax tablet, which was used as a reusable and portable writing surface in classical antiquity and throughout the Middle Ages. [1] As paper became more readily available in European countries from the 11th century onwards, wax tablets gradually fell out of use, although they remained relatively common in England, which did not possess a commercially ...