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Aluminium Oxide

Aluminium oxide particle testing standards are published by ISO, ASTm, and ONORM. ISO standards cover particle size analysis using electroformed sieves, determination of particles passing an aperture sieve, and sampling. ASTM standards cover standard practices for controlling errors in weighing collected aerosols and standard specification for aluminum oxide powder. ONORM 13920 covers aluminum alloy scrap consisting of skimmings, drosses, spills, and metallics.

ISO 2926:2013

Aluminium oxide used for the production of primary aluminium - Particle size analysis for the range 45 m to 150 m - Method using electroformed sieves

ISO 2926:2013 specifies a dry sieve method using electroformed sieves for determining the mass distribution of the particle sizes in aluminium oxide used for the production of primary aluminium. This method is applicable to calcined aluminium oxide containing a maximum of 20 % mass fraction of particles having a mean diameter exceeding 150 µm, and containing a maximum of 15 % mass fraction of particles having a mean diameter less than 45 µm. This method is not applicable to the use of woven wire sieves.

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ISO 23202:2006

Aluminium oxide used for the production of aluminium - Determination of particles passing a 20 micrometre aperture sieve

ISO 23202:2006 sets out a wet-sieving procedure for the determination of the percentage by mass of particles of smelter-grade alumina passing a 20 micrometre aperture sieve. This procedure is applicable for aluminas with a minus 20 micrometre content up to 4 %.

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ASTM D6552-06(2021)

Standard Practice for Controlling and Characterizing Errors in Weighing Collected Aerosols

1.1 Assessment of airborne aerosol hazards in the occupational setting entails sampling onto a collection medium followed by analysis of the collected material. The result is generally an estimated concentration of a possibly hazardous material in the air. The uncertainty in such estimates depends on several factors, one of which relates to the specific type of analysis employed. The most commonly applied method for analysis of aerosols is the weighing of the sampled material. Gravimetric analysis, though apparently simple, is subject to errors from instability in the mass of the sampling medium and other elements that must be weighed. An example is provided by aerosol samplers designed to collect particles so as to agree with the inhalable aerosol sampling convention (see ISO 7708, Guide D6062 , and EN 481). For some sampler types, filter and cassette are weighed together to make estimates. Therefore, if the cassette, for example, absorbs or loses water between the weighings required for a concentration estimation, then errors may arise. This practice covers such potential errors and provides solutions for their minimization. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM F7-95(2021)

Standard Specification for Aluminum Oxide Powder

1.1 This specification covers aluminum oxide (alumina) powder in two classes of particle size, two chemical grades, and two levels of acidity, for use as an insulating coating or as an ingredient of ceramic mixtures for components of electronic devices as follows: 1.1.1 Particle Sizes: 1.1.1.1 Class A —Particle size No. 500 nominal mesh (nominal average particle size = 24.3 μm). 1.1.1.2 Class B —Particle size No. 900 nominal mesh (nominal average particle size = 1.7 μm). 1.1.2 Chemical Grades —Grades 1 and 2 as specified under chemical requirements in Section 3 . 1.1.3 Acidity Levels : pH (acid) 4.5 to 6.5 and pH (neutral) 6.5 to 7.5. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The following safety hazards caveat pertains only to the test methods in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ISO 8220:1986

Aluminium oxide primarily used for the production of aluminium -- Determination of the fine particle size distribution (less than 60 mu/m) -- Method using electroformed sieves

The particles in the range of 63 to 16 m are quantitatively separated by sieving in an aqueous solution of a dispersing agent. The sieves are square-aperture or round-aperture electroformed sieves, depending on their origin. Each sieved fraction is dried and weighed.

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ISO 2927:1973

Aluminium oxide primarily used for the production of aluminium -- Sampling

Details the practical requirements for taking representative samples intended for chemical analysis and determination of the physical characteristics. Applicable to products during transport, loading/unloading, contimuous flow and storage. Will be revised when general methods are available. Taking samples is carried out without reduction of particle size by manual or mechanical removal of increments of constant mass. Storage of the increments and transport at ambient temperature in closed containers. Shall remain in the same physical and chemical state in which the sample has been drawn until the time of laboratory examination. Has also been approved by the IUPAC.

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ONORM EN 13920-16:2003

Aluminium and aluminium alloys - Scrap - Part 16: Scrap consisting of skimmings, drosses, spills and metallics (Austrian Standard)

This European Standard specifies characteristics, chemical composition and metal yield of aluminium scrap consisting of skimmings, drosses and spills. It also applies to the metallic obtained by dry processing of drosses and skimmings. Full lots of dross fines with particle size smaller than 0,8 mm, or loft of drosses with a metal yield less than 30 % are not within the scope of this Standard.

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