Borosilicate Clear Glass Rod
Physical data sheet
|
No. |
Physics performance
|
Numerical Value
|
Unit
|
|
1
|
coefficient of mean linear thermal expansion(20ºC-300 ºC)
|
3.3±0.1
|
10-6K-1
|
|
2
|
Transformation Temperature
|
525±15
|
ºC
|
|
3
|
Softening point
|
820±10
|
ºC
|
|
4
|
Working point
|
1260±20
|
ºC
|
|
5
|
Density at 20ºC
|
2.23±0.2
|
g/cm2
|
|
6
|
Mean thermal conductivity(20ºC-100ºC)
|
1.2
|
W/m.K
|
|
7
|
Refractive Index
|
0.92
|
l
|
Chemical Composition in approximate weight %( main components)
|
Item . |
SiO2
|
B2O3
|
AL2O3
|
Na2O +K2O
|
|
%
|
81
|
13
|
2
|
3.08
|
Chemical Data:
Hydrolytic resistance at 98ºC ISO719-HGB 1
Hydrolytic resistance at 121ºC ISO720-HGB 1
water resistance Grade 1 Test method: ISO1776
Acid resistant Class Grade 1 Test method: ISO1776
|
OD(MM)
|
Deviation
|
Out of round
|
Straightness
|
|
4
|
+ 0.4
|
0.4
|
3‰
|
|
6
|
+ 0.4
|
0.4
|
3‰
|
|
7
|
+ 0.4
|
0.4
|
3‰
|
|
8
|
+ 0.5
|
0.5
|
3‰
|
|
9
|
+ 0.5
|
0.5
|
3‰
|
|
10
|
+ 0.5
|
0.5
|
3‰
|
|
11
|
+ 0.6
|
0.6
|
3‰
|
|
12
|
+ 0.6
|
0.6
|
3‰
|
|
14
|
+ 0.7
|
0.7
|
3‰
|
|
16
|
+ 0.8
|
0.8
|
3‰
|
|
18
|
+ 0.9
|
0.9
|
3‰
|
|
20
|
+ 1.0
|
1.0
|
3‰
|
|
22
|
+ 1.2
|
1.2
|
3‰
|
|
24
|
+ 1.3
|
1.3
|
3‰
|
|
26
|
+ 1.4
|
1.4
|
3‰
|
|
28
|
+ 1.5
|
1.5
|
3‰
|
|
30
|
+ 1.6
|
1.6
|
3‰
|
|
32
|
+ 1.8
|
1.8
|
3‰
|
|
Special order can be taken according to requirement.
|
|||
Standard Length
Glass Rod-----------------------------------------1200+/- 20mm
Glass Rod-----------------------------------------1200+/- 20mm