1. The important difference is its chemical properties: the national standard for water resistance on the inner surface of low borosilicate ampoules is 2.6mm, while the national standard for water resistance on the inner surface of medium borosilicate ampoules is 1.3mm, and the indicators such as transparency and stability are very good.

2、Physical properties: Medium boron vial size tolerance is very small and matches better with production equipment; low boron silicate ampoule has large tolerance and is unstable between batches. For example, the tolerance of the outer diameter of 16 tubes is plus or minus standard 0.3mm and the colour is green, which is difficult to match with imported equipment or high-end equipment.

The main difference between neutral glass and low borosilicate ampoule and soda lime glass is good thermal and chemical stability, and also different from high borosilicate glass in terms of online thermal expansion coefficient and boron trioxide content. Identification is as follows:

(1) the coefficient of linear thermal expansion: is one of the main physical properties of glass, it determines the thermal stability of the glass, that is, the ability of the glass to withstand temperature changes, and the coefficient of linear thermal expansion is mainly determined by the chemical composition of the glass. Therefore, the coefficient of linear thermal expansion as a performance identification index, not only can control the performance of the glass, but also can reflect the type of glass composition.

(2) Boron trioxide content: is the main component to improve the thermal and chemical stability of the glass, within a certain range, as its content increases, the better the performance of the glass. Therefore, the determination of boron trioxide content as an identification project, not only to control the performance of glass, but also to reflect the type of glass composition. Now the content of B2O3 in neutral glass is not less than 8% (g/g).

2, 121 ℃ particle method of water resistance, the use of 121 ℃ under the glass particle water resistance determination and grading method ℃, according to the material properties to determine the index for 1 level. Control the chemical stability of glass materials.

3. 98°C particle method of water resistance determines the water resistance of glass particles at 98°C. The 98°C particle method is an important method widely used internationally to determine the grade of water resistance of glass. Neutral glass materials should meet the requirements of HGB1. Control the chemical stability of the glass material.

4, 121 ℃ internal surface water resistance test method and grading ℃ Indicator requirements to HC1. control the chemical stability of glass bottles.

5、Acid resistance is mainly used to test the degree of acid corrosion resistance of glass, so as to quantitatively determine the grade of acid resistance. The first method is the weight method. The first method is to determine the corrosion resistance of glass to boiling hydrochloric acid. The grade is determined according to the weight loss per unit surface area of the glass. Neutral glass should meet the requirements of Class 1, the next method is flame spectrometry, determined by the second method. Passage can be judged on the basis of the amount of alkaline oxide precipitated per unit surface area of the glass. Neutral glass should be less than or equal to 100μ g/dm2. control the chemical stability of the glass bottle.

6、Alkali resistance is mainly to test the degree of glass resistance to mixed alkali corrosion, so as to quantitatively determine the level of alkali resistance of glass.

7、The internal stress method is an internal stress measurement method with an ampoule as the indicator. Control the level of glass bottle annealing process.

8. The vertical axis deviation method is used to determine the circular runout with the low borosilicate ampoule as the indicator. To control the flatness and overall symmetry of the bottom surface of the container.