Center Control Smart Home Display Screen Ultra Thin Glass For Smart Speaker

Range of set value

69.0-72.0

4.5-8.0

＜0.01

6.0-8.0

3.5-5.0

0.1-1.0

13.0-14.5

1

Density

g/cm3

GB/T5432-2008

2.48±0.01

2

Refractive Index

/

GB/T 2680-2021

1.51±0.01

3

Young's Modulus

Gpa

GB/T 37780-2019

73.0±0.5

4

Transmittance

%

GB/T 2680-2021

≥91.5

5

Volume Resistivity

lg(Ω .cm)

GB/T 31838.2-2019

≥10.0

6

Dielectric Constant

/

SJ/T 11043-1996

≥7.0

7

Softening Point

℃

GB/T 28195-2011

750±10

8

Strain Point

℃

GB/T 28196-2011

516±5

9

Annealing Point

℃

GB/T 28196-2011

562±5

10

Thermal Conductivity

W/( m.K)

JC/T 675-1997

0.682±0.10

11

Thermal Expansivity

* 10-7/℃

SJ/T 11036-1996

85±5

12

Photoelastic Coefficient

nm/cm/MPa

BS 7604-1-1992

27.0±0.2

13

Poisson's Coefficient

/

GB/T 28195-2011

0.23±0.02

14

Vickers-hardness

HV

GB/T 16534-2009

610±10

CS(MPa)

DOL(um)

CS(MPa)

DOL(um)

CS(MPa)

DOL(um)

CS(MPa)

DOL(um)

3H

≥650

≥7.0

≥650

≥8.0

≥650

≥9.0

≥650

≥10.5

4H

≥600

≥8.0

≥600

≥9.0

≥600

≥11.0

≥600

≥12.5

5H

≥600

≥9.0

≥600

≥10.0

≥600

≥11.5

≥600

≥13.0

1

Dimensional Tolerance

1300*1100*(±2mm)

Tape Measure

2

Thickness

0.50~1.1    ±0.05m

1.3~2.0     ±0.05m

Micrometer

3

Thickness Difference

≤0.04mm

Micrometer

4

The Diagonal Difference
(Perpendicularity)

≤0.3%

Tape Measure

5

Stripe

≤Level2

Point Sources of Light

6

Flatness

(Before Tempering)

0.50~0.55  ≤0.15%(=h/L)

0.70~2.0   ≤0.10%(=h/L)

1

Effective Mass Area

All areas outside 10mm of the edge are effective mass areas.

2

Appearance  Defects

Scratches

w≤0.03mm, Allowed

0.03mm＜w≤0.05mm,L≤25mm (Controlled by point defects)

w＞0.05mm, Not allowed

Fluorescent Lamp 2000-2500Lux

Bubbles

d≤0.05mm, Not counted

0.05mm＜d≤0.2mm,  Numbers≤5 /m²

d＞0.2mm,Not allowed

Inclusions such as stones and sticky tin

d≤0.05mm, Not counted

0.05mm＜d≤0.2mm, Numbers≤5 /m²

d＞0.2mm,Not allowed

3

Edge Defects

Chipping

Single chipping

L≤2.0mm,W≤1.0mm,D≤1/2 of the thickness (as the right picture showed).

The cumulative length of chipping is less than 10% of the edge length of the glass plate.

4

Cracks and missing corners

Not allowed

5

Surface stains (glass shavings, attachments, point contamination)

No stains that cannot be removed by ordinary detergents are allowed.

d≤0.05mm, Not counted

0.05mm＜d≤0.3mm,  Numbers≤5 /m²

d＞0.3mm,Not allowed

The same method as appearance detection.

1

1300x1100x0.25

900

2

1300x1100x0.33

1020

3

1300x1100x0.40

900

4

1300x1100x0.50

750

5

1300x1100x0.55

680

6

1300x1100x0.70

550

7

1300x1100x0.82

490

8

1300x1100x0.95

420

9

1300x1100x1.0

410

10

1300x1100x1.1

370

11

1300x1100x1.3

310

12

1300x1100x1.5

280

13

1300x1100x1.6

250

14

1300x1100x1.8

230

15

1300x1100x2.0

200