怀来天元特种玻璃有限公司LOGO 简体中文 | EngLish
 
 


1.Normal size
(OD*W (mm))
  For heavy wall:
  51*4.0, 25*4.0, 25*4.0, 28*4.0,
  32*4.0, 32*3.2, 38*4.0, 44*4.0,
  44*4.0, 51*4.0, 51*4.8,51*7.0,
  51*7.0, 38*3.2,
  For light wall:

  10*1.5, 12*2.0, 12*2.2, 12*1.5,
  12*2.5, 13*1.8, 13*1.5, 
16*2.4,
  16*1.8, 18*1.8, 18*2.0, 
19*3.0,
  

2.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%

3.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

 
 
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