Transparent quartz glass tube industry standard for electric light source and electric vacuum instrument

Transparent quartz glass tube industry standard for electric light source and electric vacuum instrument
(People's Republic of China building materials industry standard JC/T 598-1995)
(Transparent quartz glass tube for electric light source and electric vacuum instrument (formerly GB 658-1988 is invalid)

1 Subject content and scope of application

This standard specifies the product classification, specifications, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of transparent quartz glass tubes for electric light sources and electric vacuum meters.

This standard is applicable to transparent quartz glass tubes for electric light sources and electric vacuum meters (hereinafter referred to as quartz glass tubes). Other industrial quartz glass tubes can also refer to this standard.

2 Reference standard

GB/T 3284 quartz glass chemical composition analysis method
GB4121 quartz glass thermal discoloration test method
GB5949 transparent quartz glass bubble, gas line inspection method
GB10701 quartz glass thermal stability test method
Test method for hydroxyl content in GB/T12442 quartz glass

3 terms

3.1 Ellipticity: The difference between the largest and smallest diameters on the same cross section of a quartz glass tube.
3.2 Partial wall: The difference between the largest and smallest wall thickness on the same cross section of the quartz glass tube.
3.3 Bending: The degree of straightness of the quartz glass tube in the length direction.
3.4 gas line: a linear prismatic cavity in or on the surface of a quartz glass tube.
3.5 broken gas line: the open gas line exposed on the inner and outer surfaces of the quartz glass tube, the edge is sharp.
3.6 Pitting: Small spots on the wall of quartz glass. It is a trace that remains after the particulate impurities adhering to the tube wall are removed.
3.7 gas line density: the number of gas lines per square centimeter.
3.8 color line: The colored lines formed on the quartz glass tube after the impurities in the raw material are melted.
3.9 Groove: The surface of the quartz glass tube forms uneven grooves and ribs in the longitudinal direction.
3.10 Dirty: Foreign matter that can be removed on the surface of a quartz glass tube.
3.11 crystal grain: There are obvious tiny cracks on the quartz glass tube.
3.12 Scratch: The surface of the quartz glass tube is slender and worn.
3.13 Notch: An etched line, strip or face with a relatively large surface area.
3.14 Wrap: Foreign objects enclosed in the wall of the tube were observed with the naked eye.
3.15 Impurity: A component other than silicon dioxide (SiO2) in the composition of quartz glass.
3.16 Collapse: The surface of the quartz glass is broken like a shell.
3.17 crystallization: Quartz glass precipitates crystals at a specific temperature, causing devitrification.

4 Product Categories

4.1 Classification

According to the process, the following five categories:

a. Electric heating fused quartz glass tube (referred to as continuous fusion tube);
b. Vacuum pressure method quartz glass tube (referred to as pressurized tube);
c. Gas refining and ironing two-step quartz glass tube (referred to as gas-making two-step method tube);
d. Electrofusion two-step quartz glass tube (referred to as electrofusion two-step tube);
e. Vacuum atmospheric pressure quartz glass tube (referred to as atmospheric pressure tube).

4.2 Specifications

Specifications are shown in Table 1.
Table 1
OD wall thickness
3- 60 0.5- 3.0
Note: Length and other specifications are agreed upon by the supplier and the buyer.

4.3 Grade: Quartz glass tube is classified into three grades according to dimensional deviation, appearance, impurities and hydroxyl content, first-class products and qualified products.


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