products

Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness

Basic Information
Place of Origin: Guangdong, China (Mainland)
Brand Name: Tianzhili
Model Number: sapphire glass
Price: US $5.00
Detail Information
Type: Watches For Parts Material: Sapphire
Size: 1-200mm Shape: Custom Shape
Surface Treatment: Polished Surface Quality: 80/50,60/40,40/20
High Light:

convex watch glass

,

convex crystal glass


Product Description

 

 

Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness

 

 

 

Product Description

 

 

Synthetic Sapphire is an aluminum oxide material grown in a hexagonal crystalline form. It’s a very hard material with a high resistance to heat. Because of its crystalline structure, material characteristics can change depending upon the requested orientation. SGP can CNC mill, drill, cut, lap, and polish Sapphire in many sizes, shapes, and surface finishes.

 

 

 

 

A synthetic sapphire crystal or “glass” is actually not glass at all. It is a very hard, transparent material made of crystallizing pure aluminum oxide at very high temperatures. Synthetic sapphire has the same hardness as natural sapphire gemstones, but without the colouring agents that give the gems their various hues. When it is heated, the synthetic sapphire forms round masses, that are then sliced into pieces with diamond-coated saws. These disks are then ground and polished into watch crystals. (One reason sapphire crystals are relatively expensive is that the tools required to cut and polish this extremely hard material are very costly.) Sapphire (whether natural or synthetic) is one of the hardest substances on earth. It measures 9 on the Mohs scale, which is a system for rating the relative hardness of various materials. (Diamond measures 10, the highest rating.) Watch crystals made of synthetic sapphire are often marketed as “scratch resistant” or “virtually scratchproof” because they are very difficult - but not impossible - to scratch. Diamond can scratch them; so can man-made materials that incorporate silicon carbide, which, with a Mohs rating of between 9 and 10, is harder than sapphire. So, if you accidentally scratch your watch on a simulated-stone surface or a wall that incorporates some of these silicon carbide materials, it could scratch the crystal.

 

 

Property

Specification

Thickness

0.5-50mm

Size tolerance

    0.02mm 

Edge Finish

   Ground and beveled

Surface Quality

   40-20 scratch-dig

Surface Flatness

λ/4 @ 633 nm

Parallelism

    ≤3 arc min (≤0.9 mrad)

Clear Aperture

  >80% of central diameter

Hardness (Knoop)

1370 kg mm-2

Young's modulus

3.4 x 1011 N m-2

Thermal Limit

22 W m-1 K-1

Thermal expansion coefficient

8.4 x 10-6 K-1

 

 

 

Company Information

Our company has a complete ,standardized and scientific quality management system.Characteristic lead the future. Characteristic products and service is the foundation of our cooperation,and we look forward to create brilliant achievements together with you.

 

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IMG_6313    IMG_6274

 

   

Inspection equipment

Inspection equipment

 

Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness 4     1

                        Interferometer                             Transmissivity detector

Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness 6      Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness 7

             Quadratic element                                   Orientometer

Custom Shape Convex Sapphire Glass For Watches 1-200 mm Thickness 8

      Flexural measurement

Contact Details
lijia

Phone Number : +8617722965647

WhatsApp : +8618606222729