THE AD V ANT A GES Microphotography of metallic coating Coat ET A 100 Zn Index of hardness 70 DPN Coat Zeta 94 Zn 6 F e Index of hardness 179 DPN Coat Delta 90 Zn 10 F e Index of hardness 244 DPN Coat ET A 100 Zn Index of hardness 70 DPN Base steel Index of hardness159 DPN Coat Gamma 75 Zn 25 F e 11 Galv anizing provides great resistance Once the freshly cleaned material is submerged in the molten zinc bath 450C 840 degrees F a metallurgical bond is created composed of inter metallic layers and a pure zinc layer T he frst inter metallic layer is actually harder than the base steel T his quality is what gives galv anized steel its great impact and abr asion resistance T he soft pure zinc layer helps absorb some of the shock and the inter metallics protect the base material