Quartz Glass Products

FGQuartz produces a comprehensive portfolio of quartz glass products for customers who demand exceptional purity, thermal stability, optical clarity and chemical resistance. Whether you require standard components or custom‑engineered solutions, our team delivers high‑quality fused silica parts to meet the most stringent specifications. Below you will find an overview of our product range, along with a summary of the physical properties and technical specifications that make quartz an indispensable material.

Quartz Glass Properties & Technical Specifications

Quartz glass, also known as fused silica, is composed almost entirely of silicon dioxide. Through careful melting and refinement, impurities are reduced to parts per million levels, providing extraordinary material characteristics. Key properties include an extremely low coefficient of thermal expansion, a high softening point, broad optical transmission from ultraviolet to infrared wavelengths and remarkable resistance to thermal shock and chemical attack. These attributes enable quartz to perform reliably in high‑temperature furnace environments, optical systems, laboratory apparatus and precision instrumentation.

Property Specification
The density of 2.2 cm3
The compressive strength 1100 MPa
The bending curvature 67 MPa
Tensile strength 48 MPa
Poisson’s ratio 0.14 – 0.17
Young’s modulus 72000 MPa
The rigid mode 31000 MPa
Mohs hardness 5.5 – 6.5
The deformation points 1280°C
Softening point 1780°C
Annealing temperature 1250°C
Specific heat 670 J/kg·°C
Thermal conductivity 1.4 W/m·°C
The refractive index 1.4585
Coefficient of thermal expansion 5.5 × 10⁻7 cm/cm·°C
Hot working temperature 1750 – 2050°C
Short-term service temperature 1300°C
Long-term service temperature 1100°C
The resistivity 7 × 107 Ω·cm
Dielectric strength 250 – 400 kv/cm
Dielectric constant 3.7 – 3.9
Dielectric absorption coefficient < 4 × 104
Dielectric loss factor < 1 × 104