12mm Low Borosilicate Glass Tubing For Glass Vials / Ampoules / Test Tubes

High quality and low price transparent borosilicate glass tube

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

Outstanding thermal shock and chemical stability
Drawn tube and bar products are manufactured using the latest technology to produce pristine surfaces that are smooth, non-porous, fully transparent and corrosion-resistant.
Borosilicate glass tubes, rods, profiles and capillaries are used in the production of laboratory glassware, glass fiber optic ferrules, NMR tubes, IVF pipettes, gas chromatographs, industrial instruments, process piping, solar thermal collectors and lamps.

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.

Batch preparation

First, the pretreatment of raw materials includes crushing of bulk materials, drying of pre-wetted materials, and treatment of iron-containing materials other than iron. The particle size after crushing should be 0.25 to 0.5 mm. Particles that are too coarse are not easily melted sufficiently, and the remaining powder will form stones or silicon-rich nodules in the glass; particles that are too fine are prone to disperse or agglomerate. The raw materials are accurately weighed in particle size according to a certain formula, and then mixed with a drum, stirring paddle or disc.
MeltingGlass is batch melted and refined at high temperatures to form a homogeneous, bubble-free, rock-free molten glass. The melting temperature of the glass batch varies with composition and is typically 1300-1600°C. The batch undergoes a series of physicochemical reactions that gradually and completely melt at high temperatures. With the increase of temperature, the viscosity decreased obviously, a large amount of gas and raw air escaped, the melt contained in it decomposed and the melt was clarified. The bubbles are removed at high temperature, and the chemical composition of the molten glass tends to be uniform. If necessary, mechanical stirring can be applied. After the clarification and uniform cooling are completed, the glass uniformly reaches the desired viscosity suitable for molding.

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