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. 外觀：精萘應(yīng)該呈現(xiàn)出白色或微黃色的結(jié)晶固體，無雜質(zhì)和可見的不溶性物質(zhì)。

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：精萘的純度應(yīng)達(dá)到一定的標(biāo)準(zhǔn)，通常要求在99%以上。殘留雜質(zhì)的含量應(yīng)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. 熔點：精萘的熔點應(yīng)符合特定的范圍，通常要求在78攝氏度左右。這個標(biāo)準(zhǔn)可以用來檢驗精萘的純度和晶體結(jié)構(gòu)。

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：精萘應(yīng)具有低水分含量，以確保其穩(wěn)定性和防止可能的反應(yīng)或腐蝕問題。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. 無機(jī)雜質(zhì)含量：精萘必須符合一定的無機(jī)雜質(zhì)含量標(biāo)準(zhǔn)，如硫、氮、鐵、銅等。這些雜質(zhì)含量應(yīng)控制在較低的水平，以確保精萘的質(zhì)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，在存儲、包裝和運輸過程中，精萘還需要滿足一系列的安全和環(huán)境要求，以確保人員和環(huán)境的安全性。這些標(biāo)準(zhǔn)可能因地區(qū)和使用領(lǐng)域的不同而略有不同。因此，在實際使用過程中，應(yīng)該參考相關(guān)的國家或地區(qū)標(biāo)準(zhǔn)來確定具體的要求。

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.