Rare earth - Determination of moisture content in rare earth products

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Number

2026/126
Issue date

20-04-2026
Expiration date

19-06-2026
Status

Finished

Description

This document specifies a gravimetric method for the determination of the moisture content in rare earth solid concentrate, rare earth oxides and rare earth fluorides.

The specified measurement ranges for moisture are shown in Table 1. An instrument capable of achieving the below ranges is used for this determination.

Table 1 — Measurement range — Gravimetric method

Sample types	Validated measurement range in the inter-laboratory test (mass fraction %)	Applicable measurement range by this determination method (mass fraction %)
Rare earth solid concentrates	0,16 to 6,65	0,10 to 10,0
Rare earth oxides
Rare earth fluorides

This document is not applicable to:

a) lanthanum oxide and neodymium oxide;

b) rare earth oxides containing lanthanum oxide or neodymium oxide, such as lanthanum-cerium oxide, praseodymium-neodymium oxide, etc.

This document does not involve sampling.

NOTE Since the lanthanum oxide and neodymium oxide will react with water and carbon dioxide in the air, moisture cannot be accurately determined. However, this method can also be a guidance for the determination of the moisture in these materials.

International reference number

ISO 24548:2025

Project type

Adoption