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Differences between low borosilicate and middle borosilicate control bottles

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[Abstract]:
Differences between low borosilicate and middle borosilicate control bottles

Differences between low borosilicate and middle borosilicate control bottles

 

1. The most important is the difference between its chemical properties: 3 ml vial, for example, low borosilicate small bottles of the inner surface of the water resistance of national standard is 2.6 mm, inner surface water resistant borosilicate small bottle in the national standard is 1.3 mm, simple said water resistance is small bottle in bottle manufacturing factory on the subsequent processing in the process of adsorption on the inner wall of the small bottle harmful alkaline oxides, such as potassium sodium oxide, the less water resistant is better, good water resistance to drugs of PH, acidity, clarity, and stability of various indexes such as it is very good.

 

2. Physical properties: the size tolerance of middle boron vial is very small. For example, the outer diameter tolerance of 16 tubes can be controlled at plus or minus 0.15mm.The tolerance of low borosilicate is large and unstable between batches. For example, the tolerance of outer diameter of 16 tubes can be controlled at plus or minus 0.2mm. The color is green, which is difficult to match with imported equipment or high-end equipment.

 

    1. The main difference between neutral glass and low-borosilicate glass and sodium-calcium glass is that it has good thermal stability and chemical stability. The online thermal expansion coefficient and the content of boron trioxide are also different from that of high-borosilicate glass.Accordingly, the identified items are:

 

    (1) linear thermal expansion coefficient: is one of the main physical properties of glass, it determines the thermal stability of glass, that is, the ability of glass to withstand temperature fluctuations, and linear thermal expansion coefficient is mainly determined by the chemical composition of glass.Therefore, the linear thermal expansion coefficient as the property of identification, can control the use of glass, and can reflect the type of glass composition.The linear thermal expansion coefficient of neutral glass is set as no more than 5× 10-6k-1 (20℃~300℃).

 

    (2) content of boron trioxide: it is the main component to improve the thermal and chemical stability of glass, and in a certain range, with the increase of its content, glass performance is better.Therefore, the determination of boron trioxide content as the identification of the items, can control the use of glass, and can reflect the type of glass composition.The content of B2O3 in neutral glass is determined to be no less than 8% (g/g).

 

    2. Water resistance of 121℃ particle method the water resistance of glass particles at 121℃ was measured and graded (YBB00252003), and the index was rated as level 1 according to the material performance.Control the chemical stability of glass materials.

 

    3. The water resistance of glass particles at 98℃ was determined by YBB00362004.The 98℃ pellet method is an important method widely used to test the water resistance of glass in the world.Neutral glass material should meet the requirements of HGB1 level.Control the chemical stability of glass materials.

 

    4. Inner surface water resistance test method and classification (YBB00242003) were adopted for inner surface water resistance at 121℃, and the index requirements reached HC1 level.Control the chemical stability of glass bottles.

 

    5. Acid resistance is mainly used to test the tolerance of glass to acid corrosion, and determine the grade of acid resistance quantitatively.The first method is grainy. The method is determined by the first method of determination of the resistance of glass to boiling hydrochloric acid corrosion (YBB00342004).Neutral glass shall meet class 1 requirements.The second method was flame spectrometry, which was determined by the second method of determination of the resistance of glass to boiling hydrochloric acid (YBB00342004).According to the amount of alkaline oxide precipitation per unit surface area of the glass to determine whether qualified.Neutral glass shall be less than or equal to 100 g/dm2.Control the chemical stability of glass bottles.

 

    6. Alkali resistance is mainly used to test the tolerance of glass to mixed alkali corrosion, so as to quantitatively determine the level of alkali resistance of glass.Methods the corrosion resistance of glass to boiling mixed alkali water solution was determined by YBB00352004.Control the chemical stability of glass bottles.

 

    7. Internal stress method: internal stress measurement method (YBB00162003) was adopted, and the indicators were still in ampoules (GB 2637-1995).Control the annealing process level of glass bottles.

 

    8. Vertical axis deviation method the vertical axis deviation measurement method (YBB00192003) was adopted, and the indicators were all in ampoules (GB 2637-1995).Control the flatness and overall symmetry of the bottom surface of the container.

    9. Arsenic, antimony, lead and cadmium leaching method the leaching amount of arsenic, antimony, lead and cadmium was tested (YBB00372004). The leaching limit of arsenic, antimony, lead and cadmium was set As: As≤0.2mg/L;Sb acuities were 0.7 mg/L;Pb acuities were 1.0 mg/L.Ensure the safety of ampoules.The 2005 review decided to increase the limit of cadmium leaching: Cd≤0.25mg/L.