ROLES OF PRE-FINISHED STEEL


Pre-finished steel plays a critical role in the aesthetics and durability of the building envelope and needs careful consideration to make sure the most appropriate product is chosen to provide optimum performance.


With this in mind, Colorcoat® branded products have been specifically developed to comprise a number of layers, with each layer performing a different function.


Figure 1. Typical coating layers for single-sided Colorcoat® pre-finished steel


Key


■Primer ■Pre-treatment ■Metallic coating ■Base substrate ■Backing coat


Topcoat


Topcoat


The topcoat gives the final appearance of the product and protects it from the external environment; the thicker the coating the better the protection. The specific coating used for the topcoat also determines the UV resistance.


Backing coat


All Colorcoat® products have a high performance, corrosion-resistant backing coat.


Metallic coating


The metallic coating is vital in the overall corrosion protection of the cladding. Colorcoat Prisma® and Colorcoat HPS200 Ultra® products use Tata Steel’s unique Galvalloy® metallic coating, made up of 95% zinc and 5% aluminium.


HDG provides sacrificial protection; the thicker the layer of coating, the more protection it offers. However, in aggressive environments it may leave cut edges vulnerable to increased rates of corrosion.


Galvalloy® offers both increased barrier and sacrificial protection, preventing and reducing the rate of corrosion even at the cut edge.


99


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112  |  Page 113  |  Page 114  |  Page 115  |  Page 116