Schedule 3 Specification for iron powderI1
England and Wales
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 F1... 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 f1 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. |
Annotations
Textual amendments
- F1
Word in Sch. 3 omitted (1.8.2025) by virtue of The Amendments to Subordinate Legislation (Miscellaneous Corrections) (Wales) Regulations 2025 (S.I. 2025/805), regs. 1(2), 13(4)(a)
Commencement
- I1
Sch. 3 in force at 19.2.2025, see reg. 1(2)
Footnotes
- f1
(1)
BS 410:1969 “Specification for test sieves”. Published by the British Standards Institution on 31 August 1971. Available at: https://knowledge.bsigroup.com.