ISO 15906:2007 PDF

Name: ISO 15906:2007 — Carbonaceous materials for the production of aluminium — Baked anodes — Determination of the air permeability
SKU: ISO 15906:2007
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Carbonaceous materials for the production of aluminium — Baked anodes — Determination of the air permeability

Название (английский):

ISO 15906:2007

Carbonaceous materials for the production of aluminium — Baked anodes — Determination of the air permeability

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 30 апреля 2007 г.
Издание:: ISO IS 15906 edition 1 version 1
ICS:: 71.100.10

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Описание (английский):

ISO 15906:2007 describes a method for the measurement of the air permeability of baked anodes, by determining the resistance to airflow of a specimen of specified volume at room temperature, within the range of air permeability between 0,01 nPm (nanoperms) and 10 nPm. "Green" anodes are considered to be impermeable to gas. Therefore, this test is most applicable to "baked" carbon material.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview - ISO 15906:2007 (air permeability of baked anodes)

ISO 15906:2007 specifies a laboratory method to measure the air permeability of baked carbonaceous anodes used in aluminium production. The standard defines a comparative test that determines the resistance to airflow through a cylindrical specimen at room temperature, covering a permeability range from 0.01 nPm to 10 nPm (nanoperms). “Green” (unbaked) anodes are treated as gas-impermeable; the method is intended primarily for baked anodes and similar carbon materials.

Key topics and technical requirements

Test principle: comparative timing method - measure the time to draw a specified air volume through the specimen and compare with a calibrated standard to calculate permeability in nPm.

Specimen geometry and preparation: 50 mm diameter (±0.4 mm), 20 mm height (faces parallel within ±0.05 mm). Cores are sampled per ISO 8007-2; outer 20 mm discarded, then a 20 mm section dried at 110 °C for 4 h.

Apparatus essentials: permeability cell with airtight rubber seal, membrane vacuum pump (down to 100 mbar vacuum; outlet up to 4 bar; flow up to 25 L/min), U-tube manometer with proximity sensors, high‑precision capillary standards (1–2 nPm range) for calibration, and an impermeable disc for leak checks.

Calibration and calculation: apparatus calibrated using capillary standards of known air permeability; test times between manometer sensor levels are used to compute a calibration factor and sample permeability (expressed in nPm).

Precision: stated for anode samples in the 0.7–3.4 nPm range. Repeatability r = 0.06 nPm; reproducibility R = 0.04·X + 0.09 nPm (X = material average).

Reporting: test report must reference the standard and include producer/customer names, batch references, test date/place, and results.

Applications and users

ISO 15906:2007 is practical for:

Anode manufacturers performing quality control on baked anodes.

Primary aluminium producers monitoring anode integrity to reduce air/CO2 attack and optimize anode life.

Materials testing and QA/QC laboratories evaluating permeability for product acceptance or R&D.

R&D groups developing microporous/carbonaceous materials where gas permeability is a performance parameter.

Measuring air permeability helps predict anode durability in reduction cells and supports process and material improvements.

Related standards

ISO 8007-2:1999 - referenced for sampling plans and sampling from prebaked anodes.

Prepared by ISO/TC 226 (Materials for the production of primary aluminium).

Keywords: ISO 15906:2007, air permeability, baked anodes, carbonaceous materials, aluminium production, nanoperms, anode testing, permeability measurement.

ISO 15906:2007 PDF

Abstract

Похожие стандарты

Overview - ISO 15906:2007 (air permeability of baked anodes)

Key topics and technical requirements

Applications and users

Related standards

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