... ,30H-48H,30SH-45SH,30UH-40UH,28EH-33EH High corrosion resistant Very well stable Lower price Very well stable Lower price ... ,30H-48H,30SH-45SH,30UH-40UH,28EH-33EHSalt spray test: 24 to 72 hours Coating: Ni, Zn, Epoxy, Silver, Glod, Chrome, Passivation ... Structure: Block, Tile, Disc, Ring, Segment, Cylinder, etc.High corrosion resistant