Transparent Quartz Glass Tube

Al

Ca

Fe

K

Na

Li

Mg

Pb

B

Ba

Mn

Zn

20

2.1

1.2

3.4

3.4

0.6

0.4

0.01

0.3

0.2

0.4

0.2

Purity

99.999%Sio2

The Current Highest Temperature °C

900

Density 20°CKg.m3(×103) 

2.2

Heat Expansion Coefficient Cm/Cm°C

5.5X10-7

Softening Point°C

1550

Annealing Point°C

1200

Strain Point °C

1100

Heat Exchange Index W(Cm. °C)(0-650°C)  

0.017

Dispute Pressure Intension Mpa

640

Dispute Tension Intension Mpa

60

Dispute Inflection Intension Mpa

110

Rigidity Modulus Gpa

32

Yang’s Modulus Gpa

74

Resistance Index Ω.cm  

1018

Electrical Pressure-Resistant kv/mm(a.t20°C) 

16-43

Dimension Deviation
(%)

OD

in (mm)

Grade

I,II,III

Wall Thickness Deviation
(%)

W.T

(in mm)

Tolerance

2.6≤φ<4.8

±0.3

0.6-1.0

±18

6≤φ<13

±0.3

1.1-1.5

±14

13≤φ<30

±3.0

1.6-2.0

±12

30≤φ<60

±3.0

2.1-2.5

±12

80≤φ<100

±5.0

2.6-3.0

±12

100≤φ<120

±5.0

4.6-5.6

±24

Ellipticity

Not over the absolute value of OD deviation

3-5%

Deflection of Wall

Not over the absolute value of wall thickness deviation

0.5%

Air line Length Air line Width

6≤φ<12

No limitation

Transparent quartz glass tubes are divided into Grade I, II and III according to the length of air lines and airbubbles

13≤φ<26

Angularity

Not over the tube length

3%

Length

Deviation

±1

Item

No.

Test Item

Test Method

Test Requirement

Note

5-1

Surface

Visual

Caliper

1) The surface should be clear, no dark spot, crack, airline, color bar, oval that affect the appearance.

2) No scratch, crack.

By JC/T-892

-2001

By JC/T-892

-2001

5-2

Airline

Visual

Caliper

Single length of airline ≤7mm, total length of airlines must not exceed 5% of the tube length.

5-3

Bubbles

Visual

OD≤0.2mm, Max 3pcs per cm², Max 25pcs per meter

5-4

Size

Caliper

All sizes should accord with the specification.

As per

drawing

5-5

Performance

constant temperature furnace

Keep 15mins under 1100-1200°C, and put into 20±2°C, then no crack with cold water.