2012 alibaba express products pyrex glass - customization

float glass/optical glass/Pyrex glass/white glass

Thermal properties

Maxiimun working temperature:

Short-term(10h) 500

Long-term(10h) 450

Viscosity of Glasses

Working point 10⁴dpas 1270

Softening point 10^7.6dpas 820

Annealing point 10¹³dpas 560

Strain point 10^14.5dpas 518

Transformation Temperature(Tg0 525

RTG

1 hour 110K

1-100hour 90K

100hour 80K

Glass Thickness RTS

3.8mm 175K

5.0-5.5mm 160K

6.5-12.0mm 150K

Technical Properties

Density25 2.3g/cm³

Youngs Modulus E 63kn/mm³JC/T678-1997

Poissons Ratio u 0.18 JC/T678-1997

Bending strength 59.3MPa JC/T678-1997

Hardness H 6 GB/T16534-1996

Thermal Properties

Coefficient of Linear Thermal α 20-300 3.3*10^-6k^-1

Thermal conductivity λ(90) 1.2W*(M*K)^-1

Specific Heat Capacity Cp(20-100) 0.83K1*(kg*k)^-1

Chemical Resistance

Hydrolytic resistance according ISO 719/DIN 12 111 HGB 1

According ISO 720 HGA 1

Acid resistance according ISO 1776/DIN 12 116 1

Alkali resistance according ISO 695/DIN 52 322 A 2

Optical Properties

Wavelength λ(nm) 435.8 479.9 546.1 589.3 643.8 656.3

Index of Refraction n 1.48023 1.47685(nF) 1.47326(ne) 1.47145 1.46975(nc) 1.46925

Refractive index nd(λ587.6nm) 1.47178

Panel size 1200*750mm 2000*800mm we will be happy to provide other sizes upon request

Test method: Plates of approximately 20*20cm2 are heated in an oven with recirculated air and then doused in the center with 50ml of room temperature water,at which5%of the samples suffer breakage. The plates are abraded before heating with 220 grit sandpa-per to simulate typical surface condition during practical use .