GB/T 20165-2025Rare earth polishing powder (English PDF)

1 Scope

This document specifies the grades and designation methods, technical requirements, test methods, inspection rules and marking, packaging, transportation, and other aspects of rare earth polishing powder.

Transmit, store and carry documents.

This document applies to powder products with certain polishing properties that are made from cerium-based rare earth compounds through chemical processing.

Note. Rare earth polishing powder is mainly used in cover glass (including mobile phone back cover), hard disk glass substrate, optical devices, crystal, rhinestone jewelry, liquid crystal glass substrate, etc.

Surface polishing.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the latest version (including all amendments) applies to this document.

This document.

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 8170 Rules for rounding off values and expression and determination of limit values

GB/T 12690.2 Chemical analysis of non-rare earth impurities in rare earth metals and their oxides - Part 2.Ignition temperature of rare earth oxides

Determination of quantity by gravimetric method

GB/T 12690.3 Chemical analysis of non-rare earth impurities in rare earth metals and their oxides Part 3.Moisture in rare earth oxides

Determination of quantity by gravimetric method

GB/T 14635-2020 Chemical analysis methods for rare earth metals and their compounds—Determination of total rare earth content

GB/T 18115.2 Chemical analysis of rare earth impurities in rare earth metals and their oxides Part 2.Lanthanum, praseodymium, neodymium, samarium,

Determination of the amount of europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium

GB/T 20166.1 Chemical analysis methods for rare earth polishing powders Part 1.Determination of cerium oxide content Titration method

GB/T 20166.2 Chemical analysis methods for rare earth polishing powders Part 2.Determination of fluorine content - Ion selective electrode method

GB/T 20167 Test methods for physical properties of rare earth polishing powders - Determination of polishing loss and scratches - Gravimetric method

GB/T 20170.1 Test methods for physical properties of rare earth metals and their compounds - Determination of particle size distribution of rare earth compounds

GB/T 20170.2 Test methods for physical properties of rare earth metals and their compounds - Determination of specific surface area of rare earth compounds

GB/T 31057.1 Tests for physical properties of granular materials - Part 1.Measurement of bulk density

GB 39176 Packaging, labeling, transportation and storage of rare earth products

GB/T 40795.2 Chemical analysis methods of lanthanum, cerium and their compounds - Part 2.Determination of rare earth content

JJG119-2018 Laboratory pH (Acidity) Meter

3 Terms and Definitions

The terms and definitions defined in GB/T 20167 apply to this document. […]