This document is prepared in accordance with the provisions of GB/T 1.12020 "Guidelines for Standardization Work Part 1 Structure and Rules for Starting Standardization Documents".
Drafting
Please note that some of the contents of this document may involve patents. The issuer of this standard does not assume responsibility for identifying patents.
This document is proposed by China Light Industry Federation.
This document is attributed to the National Technical Committee for Standardization of Glass Instruments (SAC/T C178).
1 Scope
This document specifies the technical requirements for the quality classification of glass measuring instruments and describes the test methods.
This document applies to the quality grading and testing of glass measuring instruments (burette, graduated aspirator, single-line aspirator, single-line volumetric flask, measuring cylinder and measuring cup).
2 normative reference documents
The following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB/T 6580 glass resistance to boiling mixed alkali aqueous solution erosion test method and classification
GB/T 6581 glass at 100C resistance to hydrochloric acid leaching flame emission or atomic absorption spectroscopy determination method
GB / T 6582 glass glass particles at 98C water resistance test method and classification
GB / T 12803 laboratory glass instruments measuring cup
The maximum allowable error of the volume of the cylinder should be in accordance with the requirements of Table 5
Table 5 maximum allowable error of the volume of the measuring cylinder
4.6 Measuring cup
4.6.1 Allowable error of capacity
The maximum allowable error of the volume of the measuring cup should be in accordance with the requirements of Table 8
Table 8 cup capacity maximum allowable error
4.6.2 Quality grading requirements of the measuring cup
Cup quality grading requirements should be in line with the requirements of Table 9
Table 9 cup quality grading requirements
5 Test methods
5.1 Structure type
Visually or with a minimum index value of 0.02mm caliper, angle ruler or appropriate measuring tools.
5.2 Specification size
Measured by calipers, height rulers and thickness gauges with a minimum index value of 0.02mm.
5.3 Appearance requirements
Measurement tools with a minimum index value of 0.02mm caliper and 10 times the reading magnification for the determination of 5.4 capacity and accuracy
Measured according to the test method specified in JJG196
5.5 Material
According to GB/T 28209 test method for the determination of 5.6 water resistance
According to GB/T 6582 test method for determination
5.7 Alkali resistance
According to GB/T 6580 test method for determination
5.8 Acid resistance
According to GB/T 6581 or GB/T 15728 test method for the determination of the GB/T 6581 test method of arbitration determination.
5.9 internal stress (birefringence of the light range difference)
According to GB/T 15726 test method for the determination of
5.10 mouth and plug tightness
The bottle will be filled with the nominal volume of water upside down 10 times (at least 10s in the inverted state) to observe the water seepage
Foreword 1 Scope 2 normative reference documents 3 Terms and definitions 4 technical requirements 5 Test methods 5.10 mouth and plug tightness
