1.Description
Our color tubing in dark blue and light blue are popular in Ameican market.

2.Popular size(OD*W (mm))
For heavy wall
19*3.0 , 25*4.0 , 28*4.0 ,  45*5.0,
50*7.0,  51*8.5,  51*4.0,  51*8.5,
60*7.0,  65*5.0,  65*5.0,   75*5.0, 
25*4.0,  32*4.0,   44*4.0,  
For light wall
19*2.0,  30*2.0, 57*2.1,  60*2.5,
60*2.2,  70*2.0, 80*1.5,  80*2.0,
85*2.0

3.Main Composition

a) SiO2: 80±0.5%

b) B2O3:13±0.2%

c) Al2O3:2.4±0.2%

d) Na2O(+K2O):4.3±0.2%

4.Physical and Chemical Properties

a) Coefficient of mean linear thermal expansion(20/300℃):3.3±0.1(10-6K-1)

b) Transformation temperature: 525±15℃

c) Melting point::1,260±20℃

d) Softening point:820±10℃

e) Density at 20℃:2.23g/cm2

f) Hydrolytic resistance at 98℃: ISO719-HGB1

g) Hydrolytic resistance at 121℃: ISO720-HGA1

h) Acid resistance class:ISO1776-1

i) Alkali resistance class:ISO695-A2