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 Hesalite Crystal -- Why?

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andrema
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PostSubject: Hesalite Crystal -- Why?   Hesalite Crystal -- Why? Icon_minitimeMon Apr 12, 2010 9:35 pm

I did a little digging prior to buying my Speedmaster and I found this interesting -- from the Omega site.

Question - Why is the Speedmaster Professional "Moon Watch" fitted with a hesalite crystal?

Answer - The Speedmaster Professional is worn by astronauts in outer space. When NASA chose this watch, they requested a hesalite crystal, which "unlike a sapphire crystal" does not break into tiny fragments on impact.This feature is very important for astronauts, as the tiny fragments of a broken sapphire crystal would pose a danger in a zero-gravity environment.


Hesalite crystal facts -- from http://omega.watchprosite.com/show-forumpost/fi-677/pi-3285826/ti-537576/s-0/


Hesalite or from other supplier could also be brandname Perspex. Both of them a PMMA sheet



Tradename Material Manufacturer

Hesalite PMMA sheet G-S Plastic Optics gsoptics.com][url=http://gsoptics.com/]gsoptics.com

Perspex PMMA sheet Lucite International [url=http://www.luciteinternational.com/]www.luciteinternational.com]www.luciteinternational.com][url=http://www.luciteinternational.com/]www.luciteinternational.com



Proporties of the materiel is:

• Exceptional light transmission with virtually no colour bias - even in thick blocks.
• Excellent resistance to outdoor weathering.
• Good resistance to impact.
• A high gloss, hard surface.
• High tensile strength and rigidity.
• Easily thermoformable with simple workshop tools.
• Easy to clean.
• Capable of being fully recycled.

____________________________________
M A R K


Last edited by andrema on Mon Apr 12, 2010 10:18 pm; edited 1 time in total
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AtomicTom
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PostSubject: Re: Hesalite Crystal -- Why?   Hesalite Crystal -- Why? Icon_minitimeMon Apr 12, 2010 10:08 pm

Makes sense ! Hesalite Crystal -- Why? 803574 Also if it's good enough to work in space, then
it's going to work fine down here ! It is actually very cool that Omega
kept the Hesalite crystal in the watch, instead of replacing it with glass.
It makes it more authentic imho !..VERY interesting information ! Hesalite Crystal -- Why? Icon_smile

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Hesalite Crystal -- Why? NewSigcopy
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Northwestguy
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PostSubject: Re: Hesalite Crystal -- Why?   Hesalite Crystal -- Why? Icon_minitimeMon Apr 12, 2010 10:33 pm

DIDN'T know that Mark! Thanks for sharing the info.
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PostSubject: Re: Hesalite Crystal -- Why?   Hesalite Crystal -- Why? Icon_minitimeMon Apr 12, 2010 10:36 pm

The history of the selection of the Speedy is good reading. Chuck Maddox's website is excellent and as I recall has the entire saga beginning with some admin/logistics weenies going out to a local Houston Jewelry store and buying one each of about 5-6 chronos on hand. Then there is the "redo" demanded by Bulova and the American Watch companies after repeatedly failing the engineering tests. Good stuff.
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merichar
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PostSubject: Re: Hesalite Crystal -- Why?   Hesalite Crystal -- Why? Icon_minitimeMon Apr 12, 2010 10:50 pm

On a side note Hesalite was used because the Flame Fusion had yet to be perfected.
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