The quality specification of industrial naphthalene has the following indicators: appearance: flake or powder crystal; color: white, slight pink or light yellow is allowed; crystallization point: no less than 77.5 ℃ (containing naphthalene not less than 95.13%); non volatile matter: no more than 0.04% of grade I product; no more than 0.06% of grade II product; ash content: no more than 0.02% of grade I product. At present, the quality of industrial naphthalene produced in China has exceeded the above indexes. Industrial naphthalene is mainly used for the production of phthalic anhydride

1）聚脂樹脂和聚酯纖維（用于織造的確良）;

1) Polyester resin and polyester fiber (used to weave Dacron);

2）塑料、薄膜形成物和橡膠的增塑劑;

2) Plasticizers for plastics, film forms and rubber;

3)清漆和磁漆的醇酸樹脂等。

3) Varnish and enamel alkyd resin, etc.