# The Bread and Flour (Wales) Regulations 2025, Schedule 3: Specification for iron powder

Extent: E+W

Specification for iron powder for the purpose of Schedule 1, paragraph 2, Table 2
(1)BS 410:1969 “Specification for test sieves”. Published by the British Standards Institution on 31 August 1971. Available at: https://knowledge.bsigroup.com.
Definition
Iron powder consisting ... of finely-divided metallic iron containing at least 90% by weight of iron and conforming to the requirements of this Schedule.
Chemical name
Iron
Chemical formula
Fe
Assay
Accurately weigh 0.25 g of sample into a stoppered flask. Add a hot solution of 1.25 g of copper sulphate pentahydrate in 20 ml of water and shake for 10 minutes. Filter rapidly and wash the filter with water; acidify the mixed filtrate and washings with sulphuric acid, and titrate with N/10 potassium permanganate. Each ml of N/10 potassium permanganate is equivalent to 0.005585 g of iron.
Description
Fine greyish-black powder of such granularity that not more than 0.1% by weight remains on a British Standard 410:1969 wire sieve nominal aperture size 150 μm and not more than 5% by weight on a British Standard 410:1969 wire sieve nominal aperture size 53 μm.
Identification
Solubility
At least 95% of the iron content when determined by the following method.
Accurately weigh 0.1 g of sample into a 750 ml conical flask. Add 450 ml 0.2% weight in weight hydrochloric acid previously warmed to 37°C. Stir continuously for 3 hours, maintaining the temperature at 37°C. Cool to room temperature and dilute to 500 ml with distilled water. Filter; determine the iron content of the filtrate by a suitable method. Calculate the total iron in solution as a percentage of the metallic iron content of the sample taken.

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Source: https://www.legislation.gov.uk/wsi/2025/88/schedule/3 (the official version)
Page: https://openlegislation.uk/bread-and-flour-wales-regulations-2025/schedule-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.