Naphthene is an organic compound that, according to the regulations of the International Organization for Standardization (ISO) and other relevant institutions, meets the following standards:

1. 外观：精萘应该呈现出白色或微黄色的结晶固体，无杂质和可见的不溶性物质。

1. Appearance: Refined naphthalene should present as a white or slightly yellow crystalline solid, free from impurities and visible insoluble substances.

2. 精萘含量：精萘的纯度应达到一定的标准，通常要求在99%以上。残留杂质的含量应控制在非常低的水平。

2. Refined naphthalene content: The purity of refined naphthalene should reach a certain standard, usually requiring over 99%. The content of residual impurities should be controlled at a very low level.

3. 熔点：精萘的熔点应符合特定的范围，通常要求在78摄氏度左右。这个标准可以用来检验精萘的纯度和晶体结构。

3. Melting point: The melting point of refined naphthalene should meet a specific range, usually around 78 degrees Celsius. This standard can be used to test the purity and crystal structure of refined naphthalene.

4. 水分含量：精萘应具有低水分含量，以确保其稳定性和防止可能的反应或腐蚀问题。通常要求水分含量低于0.5%。

4. Moisture content: Refined naphthalene should have a low moisture content to ensure its stability and prevent possible reaction or corrosion issues. Usually, a moisture content of less than 0.5% is required.

5. 无机杂质含量：精萘必须符合一定的无机杂质含量标准，如硫、氮、铁、铜等。这些杂质含量应控制在较低的水平，以确保精萘的质量。

5. Inorganic impurity content: Refined naphthalene must meet certain inorganic impurity content standards, such as sulfur, nitrogen, iron, copper, etc. The content of these impurities should be controlled at a lower level to ensure the quality of refined naphthalene.

此外，在存储、包装和运输过程中，精萘还需要满足一系列的安全和环境要求，以确保人员和环境的安全性。这些标准可能因地区和使用领域的不同而略有不同。因此，在实际使用过程中，应该参考相关的国家或地区标准来确定具体的要求。

In addition, during storage, packaging, and transportation, refined naphthalene also needs to meet a series of safety and environmental requirements to ensure the safety of personnel and the environment. These standards may vary slightly depending on the region and field of use. Therefore, in actual use, specific requirements should be determined by referring to relevant national or regional standards.