Manufacturing Process

What are the steps for tempering glass?

  • Glass is cut into the required shape first. This has to be completed before the glass is tempered, as the tempering process will weaken the glass if it is cut or etched later and can increase the chance of breakage.

  • The glass is inspected for imperfections as cracks or bubbles may cause the glass to break during the tempering process. If any defects are found then the glass cannot be tempered.

  • The cut edges are sanded and polished smooth. This removes any burrs created during cutting or etching.

  • The glass is washed to remove any grains of glass deposited during sanding, as well as any dirt that may interfere with the tempering process.

  • The cut glass is heated in a tempering oven. Glass is fed into the tempering oven in batches or continuously. The oven reaches temperatures of over 600 degrees Celsius (1,112 degrees Fahrenheit), with the industry standard being 620 degrees Celsius (1,148 degrees Fahrenheit).

  • The heated glass is then subjected to high-pressure blasts of air at various angles. This rapid cooling causes the outer surfaces of the glass to cool and contract faster than the center, giving the tempered glass its strength.

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Oleophobic Coating

What is oleophobic coating?

Oleophobic coating is an oil-resistant coating that is applied to smartphones and tablet touch screens to protect the touch screen from natural finger oil or skin oil from your face while talking on the phone.

Oleophobic when translated from Greek literally means "afraid of oil", but Oleophobic does not mean “oil proof” or “smudge-proof”. You will still leave fingerprints on your smartphone or tablet’s screen which becomes obvious after using your touch screen device for a few minutes.

However, the oleophobic coating is designed to repel the oils and dirt from your skin making it easier to clean with just a microfibre cloth. The skin oils will not “stick” to the screen so they will be easy to simply wipe off.

You won’t need any cleaning chemicals, water or other fluids to clean your touch screens, just a cleaning cloth and a small amount of energy.

Why you should not use cleaning solutions on your touch screen?

The special oleophobic coating on your device’s touch screen is there to help wipe fingerprints, oils and dirt off of the screen easy with just a microfibre cloth.

If you use cleaning fluids regularly on your screen you will remove the oleophobic coating and leave your touchscreen without any protective coating.

Once the oleophobic coating is removed you will still get the same amount of fingerprints on your screen, but a cleaning cloth or microfibre cloth will not easily remove these marks any longer.

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Touch Screen Sensitivity

How does CORAL maintain your touch screen's sensitivity?

The CORAL Screen Shield tempered glass screen protector has a layer of technologically advanced silicone pressure sensitive adhesive (PSA) that allows the screen protector to attach firmly to your touch screen so the sensitivity is not altered.

What is silicone pressure sensitive adhesive (PSA)?

Pressure sensitive adhesive (PSA) is a relatively thin flexible adhesive either single or double side coated. PSA will adhere to a variety of substrates when applied to most clean and dry surfaces with pressure. Pressure sensitive adhesives do not require solvent, water or heat to activate the adhesive. The bond is directly influenced by the amount of pressure which is used to apply the adhesive to the surface.

Relative to other PSA types silicone PSA has a low initial tack, but can withstand higher temperatures than both rubber and acrylic adhesive and will bond well with silicone substrates.

Silicone PSA also provides better UV, temperature and solvent resistance than other adhesives.

The shear resistance of silicone PSA is also greater than most other pressure sensitive adhesive types. Shear resistance is the measurement of force required to pull the pressure sensitive material parallel to the surface to which it was affixed.

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Test Results for CORAL Screen Shield Tempered Glass

PropertyCharacteristicUnitSpecificationResultTest Method
Dimension Thickness ? 330±5 335 Micrometer Method
Optical Transmittance % ≥97.0 98.5 JIS K-7105 (ASTM D1003)
Optical Haze % ≤0.3 0.2 JIS K-7105 (ASTM D1003)
Mechanical Hardness (without Silicone Pressure Sensitive Adhesive (PSA)) H ≥9H 9H Pencil Hardness Test
Mechanical Adhesion - 100/100 100/100 JIK s-5600
Mechanical Steel Wool (250g/100 times) - No Scratches No Scratches S/W #0000
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