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BS EN 1057:1996 was adopted across Europe in 1996, “Copper and copper alloys – Seamless, round copper tubes for water and gas in sanitary and heating applications”. It replaced the previously familiar standard BS 2871 Part 1: 1971, “Copper and Copper Alloys – Tubes – Copper tubes for water, gas and sanitation”.
In drawing up this standard, the opportunity was taken to rationalise tube sizes across Europe. At first glance to UK users, familiar with BS 2871 Part 1, the changes to the standard may have seemed quite large and the available options quite confusing. Yorkshire Copper Tube simplified this process by branding their products as Yorkex, Kuterlon and Minibore in line with Tables X, Y and W in BS 2871 Part 1.
Under BS EN 1057, temper condition (material strength) is designated with an ‘R’ number, the higher the number indicating a stronger material. Soft condition is denoted R220, half hard R250 and hard R290. Because of the variety of sizes both diameter and thickness should be specified when ordering to BS EN 1057. For example when ordering half hard copper tube with an outside diameter of 15mm and a thickness of 0.7mm (formerly 15mm BS 2871 Part 1 Table X tubing) the official designation is EN 1057 – R250 – 15 x 0.7mm. More simply it can be ordered as 15mm Yorkex.