GB/T 8146-2022 in English

Revision highlights and technological evolution

Compared with the 2003 version of the standard, the new version has made a leap forward in the detection methods and coverage: The new automatic electronic softening point tester method is added to achieve accurate value determination, and the innovative platinum-cobalt colorimetric method is introduced for highly transparent rosin products. The Lovibond colorimetric method is written into the normative appendix to form a multi-gradient color evaluation system.

Comparison of core detection items

Analysis of key detection technologies

Optimization of spectrophotometric colorimetric system

Establish a three-level color evaluation matrix: conventional products use rosin color standard blocks (≤5 levels); refined light-colored rosin uses Ghana 18-level color scale; water-white rosin specifies platinum-cobalt standard colorimetric solution...

Breakthrough in softening point determination

Practice has proved that the automatic determination instrument is 80% more efficient than the traditional method, and the innovative medium of replacing pure water with glycerol at >80°C effectively prevents the risk of explosive boiling...

Gas chromatographExperimental quality control

74 kinds of standard sample data were prepared to verify the system applicability, and a three-stage functional verification was established: separation ≥1.5; symmetry factor 0.9-1.5; repeatability RSD <0.8%. Improper pretreatment of the muffle furnace may cause an ash content error of 34%...

Implementation recommendations and management applications

Laboratory specification system

Strengthen reagent control and verification - GB/T601 preparations are equipped with a validity period traceability mechanism. Measuring instruments such as muffle furnaces must meet the CNAS-cl01 calibration curve acceptance...

Operation reminder: Sample melting must be carried out on a corrosion-resistant laboratory bench to prevent tetramethylammonium hydroxide from corroding the operating table.