Special materials

T glass

T glass contains a higher percentage of silica (SiO2) and alumina (Al2O3) than general-purpose E glass used for composite materials. As a result, its fiber displays highly advanced mechanical and thermal performance.

Like carbon, aramid, and other fibers, T glass is efficient as reinforcement for advanced composite materials and is used by itself or as a hybrid with carbon fiber in aerospace and sports.

T glass is also used in high-performance electronic materials for its low thermal expansion and high tensile elasticity.

■ Composition

(Unit: wt %)

Composition T glass E glass
SiO₂ 64 ~ 66 52 ~ 56
Al₂O₃ 24 ~ 26 12 ~ 16
CaO - 20 ~ 25
MgO 9 ~ 11
R₂O - 0 ~ 0.8
B₂O₃ - 5 ~ 10

■ Characteristics

Characteristics T glass E glass
Density (g/cm³) *1 2.5 2.6
Tensile strength (GPa) *2 4.8 3.2
Tensile elasticity modulus (GPa) 86 75
Maximum elongation percentage (%) 6.16 4.8
Thermal expansion coefficient (×10-6/℃) *1 2.8 5.6
Softening point (℃) *1 >1000 844
  • *1 Measured values for lumps of glass.
  • *2 Tensile strength is measured using glass fiber called "virgin fiber", which has less defects.
  • * The data listed above are examples of actually measured values and not standard ones.
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