We have a large selection Corning Gorilla Glass in stock.
The glass is great for strong and inexpensive screen displays.
Many smart phone manufacturers use inexpensive, yet very strong Gorilla glass for the phone's screen.
Client asks about our thin glass.
We wanted to get a quote for twenty-five 100mm, 30um thick wafers. We would like the wafers
SSP should be alright for us at this time.
We were wondering if you could help us with some questions about the glass:
What is the starting Corning Gorilla glass grade and specification, e.g. what thickness, modulus, temperature tolerance in general?
What is the starting thickness for thinning down?
What chemical is used for thinning down the glasses?
Has any kind of chemical strengthening has been performed on the thinned glass?
What kind of polishing process is used? How is it compatible with glass down to 30um?
Do we have the bending radius available for the 30um glass?
Do we have the temperature tolerance available for the 30um glass? That is, what is the maximum temperature the glass can tolerate before we see warpage.
We have 100mm , 30um glass wafer SSP ( SSP means single side processing in ours’, because slimming on one side from gorilla)
Answer to your questions on previous emails,
1 )glass transparent?
- Transmittance : > 91% @ 550nm
2) If it is less than 100um, how can it be easily mounted or handled when necessary?
-Since glass has 10 times stronger compressive strength than tensile strength,
it is important to handle it by placing it on a very flat surface such as flat marble plate or flat stage, etc.
- Logistics: Move by stacking packaging using gap(or slip) sheets
- During processing, a dedicated cassette made of soft material is required (if iron structure, may be damaged)
3)double side polish?
-Glass breakage is very easy to occur when there are cracks or scratches by polishing on the glass.
In particular, the ultra-thin glass is more easily damaged.
Polishing of the ultra-thin glass is not recommended because basically,
(in refer, fine scratching occurs when polishing the glass surface )
-So, we could not supply DSP type you required as below
76.2mm 100um DSP 76.2mm 50um DSP 76.2mm 30um DSP
100mm 100um DSP 100mm 50um DSP 100mm 30um DSP
150mm 100um DSP 150mm 50um DSP 150mm 30um DSP
4)as for coating SU-8 photoresist on glass?
-It is very difficult to coat PR on ultra-thin glass.
The reason for this is that if you hold the glass under vacuum during coating, it will be damaged.
5) flexible ?
- If there is no crack in the glass, the radius of curvature is R = 10mm or less.
6) need Sample 150 mm diameter with 50 um and 30 um ?
-no stock now and it is difficult to make wafer samples cureently ,
But we can send square-shaped samples as below.
: 63.8x151x0.03mm-1sheets, 69.6x120.3x0.1mm-1sh available
7) as for supply diameter > 150mm (with 30um) ?
-In principle, 300mm is also available, but it is not recommended due to very low yield in factory.
- it should be decided for within we can 200mm as you proceed
8) 1" glass wafer with thickness <100um , DSP ? , not available DSP
- if SSP , MOQ is 1500pcs
9) ) thin window material for X-ray beam (attenuation minimum) ?
(thickness < 100 microns or 100 um , melting point : 1000 – 2000 C )
-if you need hole, it is possible to make holes ( min hole =1.0mm) through which X-rays can pass.
-but melting point is not high , might be under 1000C ( softening point : 830~890C)
- Dimension tolerance : Target ± 100㎛
- Transmittance : > 91% @ wavelength = 550nm
- Refractive index : 1.51 ~ 1.55 @ 589.3nm
- Coefficient of linear expansion : 8.5~9.0 x 10^-6/℃
- Reflectivity : ~ 4%
-example thin glass- picture ( flat state , folding state ) : see the attached