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  Ƿ SPEC: 1 2 3

 

 

Surstrate Material SPEC

 

Green Soda Lime

SL

White Crown

WC

Borosilicate

LE

Synthetic Quartz

QZ

  Composition 

 

 

 

 

SiO2

73

70

60

100

B2O3

 

 

5

 

Al2O3

1

 

15

 

Na2O

15

8

1

 

K2O

1

9

1

 

RO

10

14

18

 

Thermal Properties 

 

 

 

 

Coefficient of Expansion

(50-200°C) x 10-7/°C

94

93

37

4-5

Softening point (°C)

740

710

900

1600

Transformation temp (°C)

562

520

673

 

Strain point (°C)

511

505

636

1000

Optical Properties 

 

 

 

 

Light transmittance (%)

d=2.3mm, wavelength = 400 nm

90

91

91

90

(wavelength = 200 nm)

Refractive index nd

1.52

1.52

1.53

1.46

Chemical Properties 

 

 

 

 

(weight loss mg/cm2)

 

 

 

 

Water (25°C, 4 h)

1.2 x 10-3

1.2 x 10-3

8 x 10-4

8 x 10-5

NaOH (5%) (100°C, 6 h)

1.1

1.1

1.4

0.9

HCL (5%) (80°C, 1 h)

1 x 10-2

1 x 10-2

5 x 10-3

4 x 10-4

Mechanical Properties 

 

 

 

 

Specific gravity

2.49

2.55

2.58

2.20

Young modulus (kg/mm2)

7000

7340

7540

7413

Sheer modulus (kg/mm2)

2870

2980

3260

33170

Knoop Hardness (kg/mm2)

540

530

657

615

Electrical Properties 

 

 

 

 

Bulk resistivity @ 200°C

7.7

9.6

10.6

12.5

Di-electric constant at IMH, R.T.

7.5

7.1

6.1

4.0