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Eduard Simon, a German apothecary, discovers polystyrene. [2] 1844. Thomas Hancock patents the vulcanization of rubber in Britain immediately followed by Charles Goodyear in United States. [3] 1856. Parkesine, the first member of the Celluloid class of compounds and considered the first man-made plastic, is patented by Alexander Parkes. [4] 1869.
Rhinoplasty: Treatments for the plastic repair of a broken nose are first mentioned in the Edwin Smith Papyrus, [86] a transcription of text dated to the Old Kingdom from 3000 to 2500 BCE. [87] Surgical suture: The earliest reports of surgical suture date to 3000 BC in ancient Egypt, and the oldest known suture is in a mummy from 1100 BC. [88]
Membership in SPE helps plastics professionals advance their technical knowledge through conferences, seminars, and webinars; publications including Plastics Engineering magazine, SPE News, Plastics Insight Newsletter; and resources including the Materials Database, networking opportunities, and more.
California will conclude a two-year investigation into Exxon and the fossil fuel industry's role in causing global plastic pollution by summer and decide if it will file a lawsuit against oil ...
49 kya – 30 kya: Ground stone tools – fragments of an axe in Australia date to 49–45 ka, more appear in Japan closer to 30 ka, and elsewhere closer to the Neolithic. [46] [47] 47 kya: The oldest-known mines in the world are from Eswatini, and extracted hematite for the production of the red pigment ochre. [48] [49]
WWDC 2019 (June 3–7, 2019) WWDC 2019 was held from June 3 to June 7 at the San Jose Convention Center in California. [129] [130] At the keynote that kicked off the event, Apple announced iOS 13, iPadOS, macOS Catalina, tvOS 13, watchOS 6, a redesigned Mac Pro, the Pro Display XDR, [131] and the new SwiftUI framework.
Polyethylene terephthalate (or poly (ethylene terephthalate), PET, PETE, or the obsolete PETP or PET-P ), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. [5]
A calender is a series of hard pressure rollers used to finish or smooth a sheet of material such as paper, textiles, rubber, or plastics. Calender rolls are also used to form some types of plastic films and to apply coatings. [ 1] Some calender rolls are heated or cooled as needed. [ 2] Calenders are sometimes misspelled calendars .