Issue 12, Oct/Nov
ADVERTORIAL PHILIP GRAHAME
basket tray. The zinc web is easily detached, can become airborne and cause damage to IT systems in the same way as zinc whiskers and increase data hall contamination during installation.
The resulting surface finish is shown on the photographs below.
CONCLUSION
The phenomenon of zinc whiskers is directly attributable to a surface finish that has been electroplated zinc (zinc plated). It is therefore prudent to eliminate as far as possible all products that have this form of zinc coating from a data centre installation.
In order to eliminate the risk of zinc whiskers a hot-dip galvanised finish should be specified. However, to eliminate zinc whiskers and zinc flakes a Hot-Dip Pre- Galvanised finish to BS EN 10346 or equivalent should be specified.
PRE-GALV TYPE HOT-DIP GALVANISING PROCESS (BS EN 10346) This method of hot-dip galvanising involves the application of zinc onto the
surface of sheet steel in a continuous process at the steel mill. The galvanised sheet steel is then punched and formed into the final product e.g. cable tray, cable ladder or basket tray. Hence the term pre-galvanised i.e. galvanised before manufacture.
In general terms the pre-galv and post-galv processes are very similar in that the steel is prepared using alkali, acids, and annealing before being immersed in a bath of molten zinc. There is however, one important difference in the final stages of the pre-galv process when the steel strip is passing through the molten zinc at extremely high speed (200m/min). As the strip exits the bath a set of gas knives wipe off the excess zinc and the surface is rapidly cooled to leave a smooth finish.
The resulting surface finish is shown on the photographs below.
• Cable Trunking compliant with BS EN 50085. Hot-Dip Pre-Galvanised to BS EN 10346.
Philip Grahame International manufacture a full range of cable trunking, cable tray, basket tray, cable ladder and suppports to these specifications that eliminate zinc whiskers and zinc flakes.
This can be phrased in the following ways; • Hot-Dip Pre-Galvanised Finish
• Pre-Galvanised Finish • Pre-Galvanised to BS EN 10346 or equivalent
Below are suggested full specifications that could be used for each product range.
• Cable Tray compliant with BS EN 61537. Hot-Dip Pre-Galvanised to BS EN 10346.
• Cable Ladder compliant with BS EN 61537. Hot-Dip Pre-Galvanised to BS EN 10346.
• Basket Tray compliant with BS EN 61537. Hot-Dip Pre-Galv Equivalent to BS EN 10346.
SHOULD YOU REQUIRE FURTHER DETAILS
OR ASSISTANCE WITH YOUR SPECIFICATION PLEASE CONTACT:
phil.harding@philipgrahame.co.uk www.datacenterdynamics.com 73
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