Round 50ml Borosilicate Glass Tubing For Medicine

Borosilicate5.0 Glass Borosilicate Glass Tubing Round

raw material

Including main raw materials and auxiliary raw materials. The former refers to the introduction of raw materials such as the oxides that form the network structure of the glass, the intermediate oxides and the oxides outside the network; the latter can accelerate the melting of the glass or make it obtain certain necessary properties.

main ingreadient

According to the nature of the introduced oxides, it is divided into acidic oxide raw materials, alkali metal oxide raw materials and alkaline earth metal oxide raw materials.
① Acidic oxide raw materials: raw materials such as SiO2, B2O3, Al2O3, etc. SiO2 is the skeleton of the glass structure in silicate glass. It gives the glass high strength, good chemical stability, heat resistance and low expansion, but it will increase the melting temperature of the glass and increase the viscosity. The cited raw materials of SiO2 are silica sand, sandstone, and quartzite. Adding B2O3 to the glass can reduce the thermal expansion of the glass, increase the refractive index, thermal shock resistance and chemical resistance, reduce the viscosity of the glass when the temperature is higher, and increase the viscosity of the glass when the temperature is lower. The cited raw material for B2O3 is borax or boric acid. Adding Al2O3 to the glass can reduce the tendency of glass to crystallize and enhance the chemical stability, increase the strength, and increase the viscosity of the glass. The cited raw materials are usually feldspar with K2O or Na2O and SiO2, and industrial alumina can also be used. Cangzhou Tianchang Craft Glass Products Factory specializes in the production of various types of high borosilicate glass tubes
② Alkali metal oxide raw materials: raw materials with Na2O and K2O. Adding Na2O and K2O to the glass can reduce the melting temperature and viscosity, but it will make the chemical stability of the glass worse. The cited raw materials are soda ash (Na2CO3) and potash (K2CO3).

It mainly includes the steps of batch preparation, melting, forming, annealing and post-processing.

melt

The glass batch is melted and clarified at high temperature to form a uniform glass liquid without bubbles and stones. The melting temperature of the glass batch varies with the composition, but is usually 1300-1600°C. The batch material undergoes a series of physical and chemical reactions at high temperature and gradually melts completely. As the temperature increases, the viscosity decreases significantly, and a large amount of air and the gas generated by the decomposition of the raw materials rise from the melt and escape, making the melt clear. While removing bubbles at high temperature, the chemical composition of the glass liquid tends to be uniform, and when necessary, mechanical external force is added to stir. After the clarification and homogenization are completed, the temperature is lowered to make the glass liquid uniformly reach the viscosity suitable for the molding requirements.
Melting takes place in a glass melting furnace. Continuous melting in pool kilns for mass production. The batch material is added at one end of the kiln, and the formed glass liquid is discharged at the other end. It is melted intermittently in a crucible kiln in small batches.

Our service is a one-stop service
research and development
Professional engineers and technicians, with strong independent development ability, continuous innovation and creativity. First class production environment and strict inspection procedures ensure the performance and safety of your drugs.