Sapphire Crystal or Mineral Gla&a

Thread: Sapphire Crystal or Mineral Gla&a

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  1. #1
    Member GMT-II's Avatar
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    Sapphire Crystal or Mineral Gla&a

    Hi,I heard that Sapphire Crystal is the best glass  available for any desirable watch as their watch  cover. The second best option available will be mi neral glass. In terms of price,Sapphire will be mo re ex than mineral.It is also harder than mineral  meaning higher resistance to scratch.

    But I happen to know Sapphire is also most britter  of the 2. Meaining it will shatter more easily th an mineral.

    For me,I will prefer mineral more than Sapphire co s of the shattering factor! I personally tested bo th 
    sapphire and mineral scratch resistance lvl. Of co s, sapphire will be the best but mineral also perf orms quite well. I need to use plenty of strength  before leaving a marking on mineral.

    What i concern is ,if i accidently dropped my ex w atch with the face facing down from quite high lvl . Plus usually high end watch is quite heavily and  will provide additional force.

    Chances are sapphire will crack more easily than m ineral..

  2. #2
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    Re: Sapphire Crystal or Mineral Glᦆ

    Youmightwanttogetyourspacebarcheckedout.

  3. #3
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    Re: Sapphire Crystal or Mineral Glᦆ

    Thatisjus t messedup ma n.

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  5. #4
    Member GMT-II's Avatar
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    Re: Sapphire Crystal or Mineral Glᦆ

    I think when typing that time,my pc got corrupted.. Seems unable to solve the issue. Hope is still reable for u all guys.

  6. #5
    gsm
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    Re: Sapphire Crystal or Mineral Glᦆ

    I like sapphire for its its ability to resist scratches but I would rather have acrylic over mineral glass because you can polish scratches out and it is the most impact resistant. Acrylic also has that old school feeling. Gsm

  7. #6
    Member Avengeance's Avatar
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    Re: Sapphire Crystal or Mineral Glᦆ

    There was one time when my Citizen Nighthawk took a hit and I thought for sure I had put a ding in the scratch resistant mineral crystal. I had just got done cutting a 3" metal pipe.. then welded a bead around the end... then filed the edges down. My Nighthawk took a direct hit by that thing and it didnt leave a mark... I had to check my watch half a dozen times to believe it. Lets just say that I have a new respect for the scratch resistant crystal that Citizen uses. Im not sure if all the crystals are created equal but the ones they use on the Nighthawks are GOOD!
    - Nick

    Cars or Watches... that is the question!

  8. #7

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    Re: Sapphire Crystal or Mineral Gla&a

    Whomever can read the original post, should quote it, so others can read it.

    To me, it appears as:

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  9. #8
    stuffler,mike
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    Re: Sapphire Crystal or Mineral Glᦆ

    Iamnotgoingtoanswer

  10. #9
    Member JohnF's Avatar
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    Re: Sapphire Crystal or Mineral Glᦆ

    Hi -

    There is another alternative: acrylic, aka plexiglass.

    Acrylic scratches, but the scratches can be polished out. There are hardened acrylics as well that don't scratch nearly as much.

    Mineral glass doesn't scratch as easily, but once it's there, it's there: you gotta replace it instead. When it breaks, it breaks in pieces.

    Sapphire is artifical sapphire and is much more difficult to scratch (can be done, though!) and can even be hardened by various coatings (Sinn does this). When it breaks, it shatters into tiny pieces as it is more brittle, as you have mentioned.

    What is the best? Depends.

    For a high-end watch that will not see any severe use (sport, military) sapphire is appropriate because it will show the least wear over time. For a high-end military that is highly rated, sapphire can also be appropriate, under the caveat that a very thick sapphire is used to improve ruggedness.

    For extreme altitudes and space flight, acrylic is the choice as it will give the most before failing, and when it fails it doesn't let tiny bits of glass/sapphire get into the equipment. Very bad when that happens. My diving watches have thick acrylic crystals as well. Remember, scratches can be polished out!

    For the vast majority of lesser expensive watches, mineral glass is a very good compromise and allows the money you spend to be spent on the calibre inside the watch rather than the glass protecting the face.

    A friend of mine has a Sinn 356 and was contemplating have the acrylic replaced with a sapphire crystal until he realized that he could have the acrylic one replaced a number of times before the cost came up to that of the sapphire. So once every several months, whenever he changes his toothbrush, he uses his toothbrush one last time with some nice white toothpaste to polish his acrylic crystal on his 365.

    Works great, and you can't do that with glass or sapphire.

    JohnF
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  11. #10
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    Re: Sapphire Crystal or Mineral Glᦆ

    answered my question before i asked it

    my bm is going in for a new dial, and i was considering getting the crystal replaced with sapphire, as its my work watch ( firefighter)
    looks like i'll be getting an acrylic.

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