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The material is borosilicate 3.3.And the working temperature is 450-500C.
Adopt platinum molding technology to produce 25mm and above OD glass tubesBorosilicate 3.3 series glass is a kind of special type glass material with the features of low expansion coefficient,high temperature resistance,high intensity, high rigidity, transparency and chemical stability. It doesn't explode in high temperature, and can be forged and drawn to variety of formation when soften. All these splendid features enable it to be widely used in the field of solar energy,chemical industry, pharmaceutical packaging, electric light source,artificial crystal, artificial craft decoration and so on.Compared with ordinary glass. It's non poisonous, and it has made the big progress in its mechanical property, thermal stability, hydrolytic resistance.acid resistance and alkali resistance glass High borosilicate glass products: We can provide a full range of borosilicate glass products, such as borosilicate tube, glass rods Glass tube OD from 4mm~315mm Glass rods dia from 3~42mm Glass wall thickness: 1.0mm~10mm Technical data for glass tube Main composition:1) SiO2: 80 +/-0.5% 2) B2O3: 13 +/-0.2% 3) Al2O3: 2.4 +/-0.2% 4) Na2O(+K2O): 4.3 +/-0.2% Chemical properties: 1) Coefficient of mean linear thermal expansion (20 C/300 C):3.3 0.1 (10-6K-1) 2) Transformation temperature: 525 +/-15 C 3) Working point: 1, 260 +/-20 C 4) Softening point: 820 +/- 10 C 5) Density at 20 C: 2.23G/cm 6) Hydrolytic resistance at 98 C: ISO719-HGB1 7) Hydrolytic resistance at 121 C: ISO720-HGA1