Silica glass is fused from high-quality natural silica (known as silica glass). Due to the visible bubbles and airlines, silica glass is given the features of milky-white appearance, excellent heat and acids resistance.

 
 
Extremely high-purity
Silica glass is fused from high-quality natural silica (purity 99.9%).
 
Low gas content
Quartz glass is quite often used on high temperature sintering processes. Therefore, the stable performance of it is especially required. As it consists of small amount of OH (oxy-hydrogen), and it is possible to release the little gas such as hydrogen, we provide broad ra n ge of grades, in order to meet the varied appliances.
   
Lowest thermal expansion
The average expansion coefficient of silica glass is far lower than other types of glass and crystals. Compared with ceramics and hard glass, it is approximately only 17% of them, and 5% ~ 8% of general glass. Silica glass has the extremely high heat resistance, and it can retain the stability even fast cooling right after heating up.
   
The specific heat and thermal conductivity
Silica glass specific heat is 890~1140J/kg.k (20 ℃ ~ 1000 ℃ ), against with 920~1200J/kg.k of general glass. The thermal conductivity of it is 1.3w/Mk at the temperature of 0 ℃ ; and becomes 115w/Mk at the temperature of 100 ℃ , which is 10% lower than crystals. C ompar atively speaking , the quartz glass has nearly the same specific heat and the slightly lower thermal conductivity with Silica Glass.

 
   
Outstanding electric insulation
Silica glass has similar features with quartz glass. D ue to the existing structure of small bubbles, silica glass have lower dielectric loss than quartz glass.
   
Excellent mechanical properties
Mechanical properties of silica glass are quite different from those of metals. The modulus of elasticity, bending strength and tensile strength increases along with the rise of temperature. The modulus increases sharply when the tempe rature comes to 800 ℃ ~ 900 ℃ . Since silica glass is fused by high quality silicon, its stickiness of heat resistance is quite good. However, when silica glass is used for a longer period of time at the temperature of 1,050 ℃ or higher, it tends to bend .
 
High chemical stability
Silica glass offers superior resistance to acids. This becomes evident when they are used at a concentrated acid environments at high temperatures. Due to this high chemical stability, silica glass products have 30 times higher the acid resistance of enamel, and 150 times higher than chrome-nickel alloy or porcelains. Corrosion will occur, however, when applying hydrofluoric acid or hot concentrated phosphoric acid at temperature above 300 ℃ .
 
Production specification
  • Outer diameter is 6φ~230φ , and max imum length

    can be up to 3M, or dependent on customers' needs.

  • ilica glass tubes for household electrical heaters and industrial dryer furnaces. One closed end silica glass tubes for electroplating, aquaculture and aquarium.
 

Dimensional tolerance(mm)
   
 

化學成份( PPM )
   
 
物理性能