1.  inspection standard
1.1 Definition of nouns
1.2 Tools, equipment, environmental requirements
1.3. inspection item
1.4. Tempered glass screen protector appearance inspection standard
2, inspection Specification
2.1, DROP BALL TEST
2.2, DROP TEST
2.3, Hardness of surface
2.4, Fingerprint proof effect
2.5, High/low temperature storage
3, Quality contrast images
3.1 Glass cracks contrast after bending
3.2 Water drop

1.1 Definition of nouns
1.1.1 CG：Cover glass，Glass screen Protector。
1.1.2 Ink area: Cover Glass Ink area
1.1.3 Viewing Area: View Window area
1.1.4 S: square meter ( unit mm²)
D: diameter (unit: mm)
L: length (unit: mm)
W: width (unit: mm)
N: Number
D: Distance(unit: mm)
1.1.5 legend
1.1.5.1 Dot definition

1.1.5.2 Linear definition

1.1.5.3 The sawtooth definition

1.2. Tools, equipment, environmental requirements

1.2.1 Test condition
1.2.1.1 illuminance:800-1200Lux
1.2.1.2 temperature:23±2 ºC
1.2.1.3 humidity:50±20%RH
1.2.1.4 Inspection sight distance:30±5cm
1.2.1.5 Inspection point of view: up and down,
right and left 45º
1.2.1.6 Inspection time:10s（Defect is not visible
within 10 s, Can be seen as a good product）

1.2.2 Inspection equipment
1.2.2.1 2D microscope
1.2.2.2 table lamp
1.2.2.3 Ion fan
1.2.2.4 10 times ocular lens
1.2.2.5 comparison sheet
1.2.2.6 Black and white background
1.2.2.7 spectrophotometer

1.3. inspection item
1.3.1 appearance inspection：according to《Tempered glass screen protector
appearance inspection standard》
1.3.2 dimension measurement：Based on the engineering drawings。
1.3.3 The thickness of the ink inspection(Frame)：Based on the engineering
drawings
1.3.4 The hardness of surface：7H（750g）.

1.4. Inspection progress

1.5. Tempered glass screen protector appearance inspection standard

2.1, DROP BALL TEST
Test environment： Steel ball drop tester
Test objective： Test the product impact resistance performance
Test method： Free drop three times at height of 30cm（Center of screen protector）
Test standard：The product is not crush.

2.2, DROP TEST
Test environment： Drop test frame
Test objective：        Test the anti-dropping performance of glass screen protector
Test method：           Free drop at height of 30cm test frame（cement floor），Each test For
front side and opposite side.
Test standard：        Test sample appearance not cracked.

2.3, Hardness of surface
Test condition:   Pencil Hardness tester
Test objective:    Test the hardness of surface
Test method:       Use 7H pencil【MITSUBISHI】，pencil lead sharpening to cylindrical and smoothed flat on    the sand paper，install it on the pencil hardness tester(Pencil and horizontal plane angle of 45 °) ,load 765g, push pencils sliding forward not less than 7 mm, Then use the eraser wipe marks clean, check whether there is any scratch on product surface.
Test standard:     Product surface without scratches

2.4, Fingerprint proof effect

Test condition:   Water Angle tester、rubbing machine
Test objective:    Test the fingerprint proof effect of glass surface
Test method:      The initial water Angle ≥112±2°
Test standard:    Use No.0000 steel wool(superficial area 10*10MM),1000 g friction force, after 2000 times                                      friction ,water angle ≥100°

2.5, High/low temperature storage

Test condition： 80℃ /-40℃
Test objective：  High/low temperature storage performance test
Test method：    After placed in temperature 80℃/-40℃ 240 hours，placed in indoor temperature 24 hours,                                  Check the performance and appearance of the product.

Test standard： Sample performance and appearance conform to the finished product inspection standards.

3.1 Glass cracks contrast after bending
3.1.1 Powell Corning Glass

3.1.2 Powell Asahi Glass

3.1.3  Compare

3.2 Waterdrop
3.2.1 Powell Glass screen protector water drop

Powell always keeping high-end quality control, just one thing for our customer: Create wonderful experiences.

You protector, our business. Contact us purchasing the best glass screen protector now.