**What is BS 1728-11 - Determination of silicon using perchloric acid method about?**

BS 1728 is a British Standard on the testing methods for the analysis of aluminium and aluminium alloys.

BS 1728-11 is the 11^th part of the BS 1728 series that discusses the determination of silicon using the perchloric acid method for the analysis of aluminium and aluminium alloys. Aluminium alloys are widely used in engineering structures and components requiring lightweight or corrosion resistance.

**Who is BS 1728-11 - Determination of silicon using perchloric acid method for?**

BS 1728-11 on the determination of silicon using perchloric acid method applies to:

Manufacturer of aluminium products and alloys
Silicon manufacturers
Product design engineers
Quality testing personnel

**Why should you use BS 1728-11 - Determination of silicon using perchloric acid method?**

Perchloric acid is used to separate potassium from sodium in many laboratory tests and industrial processes that use the salts of perchloric acid including explosives and plating metals. Perchloric acid may explode, and it decomposes on heating producing toxic and corrosive fumes. The presence of iron in aluminium helps decrease casting defects, improves tensile, yield, and hardness, and maintains strength at high temperatures.

BS 1728-11 provides you with the principle of silicon in which the silicon is converted to insoluble silica by the dissolution of the metal with sodium hydroxide solution followed by evaporation with hydrogen peroxide and fuming with an excess of perchloric acid. If tin and antimony are present, they are volatilized as the bromides. After filtration, the silica obtained is determined by the loss of weight of the calcined precipitate after treatment with sulphuric and hydrofluoric acids.

BS 1728-11 gives you the range in which the method is recommended for silicon contents from0.1 per cent upwards. This helps you with the analysis of aluminium and aluminium alloys. BS 1728-11 exemplifies silicon using the perchloric acid method for the analysis of aluminium and aluminium alloys.

BS 1728-11:1960

Methods for the analysis of aluminium and aluminium alloys - Determination of silicon (perchloric acid method)

Current, Under Review

Published:

24 May 1960