锇：是一种密度大的自然元素——其密度是铅的两倍——这种蓝灰色的金属在需要硬度和稳定性的应用领域大放异彩。
Osmium (Os) : The densest of natural elements-twice as dense as lead-this blue-grey metal finds a home in applications where hardness and durability are essential.
石榴石产品硬度，比重，热稳定性测定。
Hardness, specific gravity and thermal stability of garnet product.
因此，辊子表面有极高的硬度、脆性及热不稳定性。另外，由于高的硬度使之具有高的裂纹敏感性。
Therefore, the roll surface is extremely hard and brittle and it is thermally unstable. In addition, it is highly crack sensitive because of the high hardness.
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