优等品是指符合质量标准中有关优等品各项技术条件的产品，是合格品中最高等级的产品。对产品的性能、寿命、安全性、可靠性、经济性、外观、包装等都有严格的要求和规定。优等品需经有关主管部门评定确认，并获得各级颁发的优质产品证书。国家对于商品的等级划分为四个级别：优等品、一等品、合格品和不合格品。
产品严格按照国家标准设计生产，所有原材料及配件均选用优等品。
Products in strict accordance with the national standards for design and production, all raw materials and accessories are selected excellent products.
实际上称这些物品为优等品会更好，但是现在已经很难改变这种惯用说法了。
It would have been better to call such goods superior, but it is toolate to change such a widely accepted convention.
物理状态：单斜晶，优等品为无色透明体，一等品为无色或带淡黄色晶体。
Physical : features : monoclinic, lolorless for excellent, lolorless or light yellow crystal for first grade.
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