Know how! [The way you treat Marwitz frames made of the new optyl]

Catalogue Number: 2083
Know how! [The way you treat Marwitz frames made of the new optyl]
Category: Memorabilia and ephemera
Sub-Category: Advertising, trade and products
Corporation: MARWITZ Optyl-Brillen
Year Of Publication/Manufacture: Undated
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Germany
Publisher/Manufacturer: MARWITZ Optyl-Brillen
Description Of Item: Booklet, stiff card sky blue cover, 10 pages, 15 black and white illustrations. The booklet advertises that Marwitz optyl frames are now avaiable and gives advice on lens insertion, frame adjustment and cementing nose pads
Historical Significance: This booklet probably dates from the 1970s when 'optyl' began to be used for 'plastic' spectacle frames. Cellulose acetate was the most common plastic used for 'plastic' spectacle frames prior to 1975. It is often called zylonite, zylo or zyl in the USA or less commonly xylonite in the UK. Cellulose nitrate was used in earlier times (and also confusingly sometimes called zyl) but is highly flammable and has not been not used for many years. Polymethyl methacrylate (Acrylic, PMMA, Perspex) was used in the 1950s and 1960s but was never a common frame material. Epoxy resins began to be used in the 1970s under the name of 'Optyl' and it was claimed to be hypoallergenic and also less likely to distort CR39 lenses, which had beome to replace glass for spectacle lenses from the 1970s, into a bitoric shape. See: Dowaliby M, Nichols E, Bailey ME.Comparative study involving bitoric effect of hard resin lenses mounted in optyl frames, zylonite frames, and metal frames. Am J Optom Physiol Opt. 1980 Feb;57(2):109-12. and Herzberg J. [Studies on a new epoxy plastic "Optyl" for the manufacture of spectacle frames]. Berufsdermatosen. 1973 Feb;21(1):1-6.
How Acquired: Donated by Elizabeth Hatfield, member of the College
Date Acquired: August 2012
Condition: Mint
Location: Archive office. Pamphlet and ephemera filing cabinet. Drawer 5

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