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Southern Sheeting Supplies, Industrial, Agricultural, Domestic

Non-Prime Materials


In order to answer this, it is necessary to understand the process by which sheets are manufactured.

The uncoated steel is shipped from the steel mill to the coating plant as a coil of pre-galvanised steel, ready to be applied with one of the various coloured coatings available.

If, during this coating process a fault develops on the coating line, or the operator feels the coating has not been perfectly applied, the material will be set aside and classified as ‘non-prime’. The reasons for this are many and varied but may include:

Other reasons for material to be classified as 'non-prime' include:

It is important to remember that the galvanised substrate is the same whether ‘prime’ or ‘non-prime’, however the difference in the ‘non-prime’ coating means it will almost certainly have a reduced life. It is impossible to say how long it will be before a breakdown in the surface coating begins and a noticeable difference in the materials' appearance occurs, however it' likely to occur quicker than with a 'prime’ sheet. It could happen within just a few years or, it may well take many years.

Of course, the sheets can be over-painted at a later stage as to maintain the appearance where desired, and as the substrate is galvanised steel, the effect on the overall life of the sheet, in terms of perforation, will be marginal in comparison.

Generally speaking if long term reliability of the colour and coating is required, on-going maintenance of the sheeting is difficult, or just for peace of mind, you may want to consider investing in the additional cost for full prime, guaranteed material.