SHINKOSHA Crystals for a bright future
SHINKOSHA CO.,LTD.
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Sapphire
Sapphire for watch window
 
 
We supply sapphire to watch industry during over 35 years. Our products are highly admired by watch makers internationally. Sapphire for watch window
 
 
Moh’s hardness: 9
Knoop hardness: Normal to c axis: 1525 - 1660 kgf / mm2
parallel to c axis: 1670 - 2000 kgf / mm2
Density:

3.98 g / cm3
Melting point: 2,040 deg
 
  We would appreciate your request on size, shape, etc.
Please send any questions or requests for sales@shinkosha.com .
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