Material data

Our TGI borosilicate glass “I-330” can meet the highest demands placed on household glassware. It complies in full with the international standards for borosilicate glass 3.3, e.g. DIN ISO 3585.

TGI borosilicate glass type “I-330” is characterised by the diversity of its applications and processing options. It is approved for use with foodstuffs and is both dishwasher- and microwave-safe. This glass is therefore the optimum choice for all households. In addition, we always ensure flawless, practical handling of our large batches to meet the needs of our customers exactly.

For your information, here is the chemical composition of our TGI borosilicate glass I-330:

80 by wt. SiO₂
13 by wt. B₂O₃
4 by wt. Na₂O₃
2 by wt. Al₂O₃
1 by wt. K₂O

Chemical properties:

Water resistance tested to DIN ISO 719 (at 98 °C): HGB 1 with a typical consumption of 0.04 ml hydrochloric acid [c(HCl) = 0.01 mol/l] per one gram glass grit
Water resistance tested to DIN ISO 720 (at 121 °C): HGA 1 with a typical consumption of 0.04 ml hydrochloric acid [c(HCl) = 0.02 mol/l] per one gram glass grit
Alkali resistance tested to DIN ISO 695: class A2 with a typical mass loss of 150 mg/dm²
Acid resistance tested to DIN 12 116: class 1
Acid resistance tested to DIN ISO 1776 with a typical alkali delivery of 50 mg Na₂O/dm²

Physical properties:

Mean linear thermal expansion:
α (20 °C ... 300 °C) = 3,3 ± 0,1 x 10^–6 K^–1
Density at 20 °C: ρ = 2,23 g/cm³
Mean thermal conductivity (20 °C ... 100 °C):
λ = 1,2 W m^–1 K^–1
Working point:
ϑ_f1 = 1250 °C at a viscosity of η_f1 = 10⁴ dPa · s
Littleton/Softening point:
ϑ_f2 = 815 °C at a viscosity of η_f2 = 10^7,6 dPa · s
Annealing point:
ϑ_f3 = 560 °C at a viscosity of η_f3 = 10¹³ dPa · s
Strain point:
ϑ_f4 = 510 °C at a viscosity ofη_f4 = 10^14,7 dPa · s
Transformation temperature: t_g = 530 °C
Maximum permitted usage temperature: 500 °C
Modulus of elasticity: E = 64 GPa