** Low borosilicate glass tube COE 7.0
** Sizes can be produced by customers' request.
|
Physical Property
|
|
No.
|
Physical performance
|
Numerical Value
|
Unit
|
|
1
|
Coefficienf of mean linear thermal expansion(20ºC,300ºC)
|
7.0±0.1
|
10-6K-1
|
|
2
|
Transformation temperature
|
550±15
|
ºC
|
|
3
|
Softening point
|
750±10
|
ºC
|
|
4
|
Working point
|
1110±20
|
ºC
|
|
5
|
Density at 20ºC
|
2.46±0.02
|
g/cm3
|
|
Main Composition
|
|
SiO2
|
B2O3
|
Na2O
|
BaO
|
CaO
|
Al2O3
|
|
70
|
6.6
|
11
|
<2
|
<3
|
6.2
|
|
Chenical Property
|
|
Water resistance to ISO720
|
1
|
|
Water resistance to European Pharmacopoeia
|
1
|
|
Water resistance to USP23
|
1
|
|
Acid resistance Class(DIN12116)
|
1
|
|
Alkali resistance Class(ISO695)
|
2
|
|
