ISO 806:2004 PDF

Aluminium oxide primarily used for the production of aluminium — Determination of loss of mass at 300 degrees C and 1 000 degrees C

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Title (English):

ISO 806:2004

Aluminium oxide primarily used for the production of aluminium — Determination of loss of mass at 300 degrees C and 1 000 degrees C

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: October 12, 2004
Edition:: ISO IS 806 edition 2 version 1
ICS:: 71.100.10

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Description (English):

ISO 806:2004 specifies a method for the determination of loss of mass on heating of aluminium oxide at 300 °C and further loss of mass on ignition at 1 000 °C. By industry convention, these mass losses are often referred to as "moisture (MOI)" and "loss on ignition (LOI)" respectively. This method is suitable for calcined alumina in the range 0,2 % to 5 % loss of mass at 300 °C and 0,1 % to 2 % loss of mass at 1 000 °C. This method provides for samples to be treated on an "as-received" basis for determination of actual MOI and LOI in alumina samples. To improve precision of analysis in cases where "as-received" results are not required, samples can be "air-equilibrated" prior to analysis. "Air-equilibration" can greatly affect MOI results and significantly alter LOI results. The "air-equilibration" procedure and its effects are discussed. Instrumental methods are also discussed.

Technical details

Technical committee: ISO/TC 226 - Materials for the production of primary aluminium
SKU: ISO 806:2004

Abstract

Overview

ISO 806:2004 specifies a standardized laboratory method for determining mass loss of aluminium oxide (alumina) when heated to 300 °C and subsequently to 1 000 °C. Industry terminology treats the 300 °C mass loss as moisture (MOI) and the additional loss at 1 000 °C as loss on ignition (LOI). The method is suitable for calcined alumina with typical ranges of 0.2–5 % MOI and 0.1–2 % LOI, and it supports both manual and instrumental (thermogravimetric) analyses.

Key topics and technical requirements

Scope and purpose: Measurement of mass loss at 300 °C (2 h) and at 1 000 °C (2 h) on defined test portions; results reported as percent mass loss.
Sample handling: Minimize atmospheric exposure; samples may be tested “as‑received” or intentionally “air‑equilibrated” (Annex A). Air‑equilibration improves precision but raises MOI and can alter LOI.
Apparatus:
- Platinum crucibles with lids (≈25 ml capacity)
- Oven controllable at (300 ± 2) °C with forced air circulation
- Furnace controllable at (1 000 ± 10) °C
- Balance with resolution 0.0001 g
- Vacuum desiccator with specified heat sink and desiccant tray
Procedure summary:
- Condition crucible (1 000 °C, 15 min), weigh
- Add ~(5 ± 0.5) g test portion, heat at 300 °C for 120 min, cool in desiccator, weigh
- Ignite dried portion at 1 000 °C for 120 min, cool in desiccator, weigh
- Calculate MOI and LOI (dried or undried basis) and report to 0.01 %
Desiccants & safety: Phosphorus pentoxide, activated alumina, or magnesium perchlorate; warnings about hazards and regeneration of magnesium perchlorate.
Instrumental methods: Thermogravimetric analysis (TGA) is acceptable if ramp times and atmospheres are validated to match manual method accuracy and precision.

Applications and who uses it

Quality control in primary aluminium production and smelter-grade alumina manufacturing.
Laboratories performing compositional certification, incoming raw material inspection, and process control.
Industrial chemists, QA/QC engineers, laboratory managers, and standards compliance officers who need reproducible MOI/LOI data for product specification, storage decisions, and process optimization.
Useful for vendors and purchasers requiring consistent reporting of moisture and volatile content.

Practical notes

Air exposure rapidly increases apparent MOI and LOI; follow either the as‑received or air‑equilibrated protocol consistently.
Maintain strict temperature control and weigh immediately after controlled cooling to avoid re‑adsorption.
Use TGA only after demonstrating equivalence with the manual method (precision data and interlaboratory validation referenced in Clause 9).

Related standards

ISO 806:2004 prepared by ISO/TC 226 (Materials for the production of primary aluminium)
Based on AS 2879.1‑2000; precision guidance per AS 2850
Replaces earlier ISO 806:1976 and ISO 803:1976

Keywords: ISO 806:2004, aluminium oxide, alumina, loss on ignition, LOI, moisture (MOI), 300 °C, 1000 °C, thermogravimetric, as-received, air-equilibrated, test method.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Scope and purpose: Measurement of mass loss at 300 °C (2 h) and at 1 000 °C (2 h) on defined test portions; results reported as percent mass loss.
Sample handling: Minimize atmospheric exposure; samples may be tested “as‑received” or intentionally “air‑equilibrated” (Annex A). Air‑equilibration improves precision but raises MOI and can alter LOI.
Apparatus:
- Platinum crucibles with lids (≈25 ml capacity)
- Oven controllable at (300 ± 2) °C with forced air circulation
- Furnace controllable at (1 000 ± 10) °C
- Balance with resolution 0.0001 g
- Vacuum desiccator with specified heat sink and desiccant tray
Procedure summary:
- Condition crucible (1 000 °C, 15 min), weigh
- Add ~(5 ± 0.5) g test portion, heat at 300 °C for 120 min, cool in desiccator, weigh
- Ignite dried portion at 1 000 °C for 120 min, cool in desiccator, weigh
- Calculate MOI and LOI (dried or undried basis) and report to 0.01 %
Desiccants & safety: Phosphorus pentoxide, activated alumina, or magnesium perchlorate; warnings about hazards and regeneration of magnesium perchlorate.
Instrumental methods: Thermogravimetric analysis (TGA) is acceptable if ramp times and atmospheres are validated to match manual method accuracy and precision.

Applications and who uses it

Quality control in primary aluminium production and smelter-grade alumina manufacturing.
Laboratories performing compositional certification, incoming raw material inspection, and process control.
Industrial chemists, QA/QC engineers, laboratory managers, and standards compliance officers who need reproducible MOI/LOI data for product specification, storage decisions, and process optimization.
Useful for vendors and purchasers requiring consistent reporting of moisture and volatile content.

Practical notes

Air exposure rapidly increases apparent MOI and LOI; follow either the as‑received or air‑equilibrated protocol consistently.
Maintain strict temperature control and weigh immediately after controlled cooling to avoid re‑adsorption.
Use TGA only after demonstrating equivalence with the manual method (precision data and interlaboratory validation referenced in Clause 9).

Related standards

ISO 806:2004 prepared by ISO/TC 226 (Materials for the production of primary aluminium)
Based on AS 2879.1‑2000; precision guidance per AS 2850
Replaces earlier ISO 806:1976 and ISO 803:1976

Keywords: ISO 806:2004, aluminium oxide, alumina, loss on ignition, LOI, moisture (MOI), 300 °C, 1000 °C, thermogravimetric, as-received, air-equilibrated, test method.

ISO 806:2004 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Practical notes

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Practical notes

Related standards

Related standards

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