Name: 1,4,5,8-Naphthalenetetracarboxylic acid
Synonyms: Naphthalene-1,4,5,8-tetracarboxylic acid
Chinese Names: 1,4,5,8-萘四甲酸
Molecular formula：C₁₄H₈O₈
Structural formula：

Molecular weight:304.21
CAS Registry Number: 128-97-2
EINECS: 204-924-7

Shape:
　　 Light yellow or white powder. 1,4,5,8-naphthalenetetracarboxylic acid has no fixed melting point, it will be decomposed at 200-250℃, dewatering and form
1,4,5,8-naphthalenedianhydride at 140-150℃. It is easily dissolved in acetone that contain water, dissolved in water and hot acetic acid slightly, dissolved in benzene, chloroform, CS2 and ethanol hardly. It is indissolved in organic solvent.
Use:
　　 1,4,5,8-naphthalenetetracarboxylic acid is mainly used in producing reduction bright orange (reduction claret 2R) and reduction scarlet GG, reduction brown B and reduction brown 5R. 1,4,5,8-naphthalenetetracarboxylic acid could produce new polyamide, TNM polyamide and TNM polymer that are good in insulation, counter-radiate and heatproof (above 400℃).
Packing:
　　 Two layers packing, the internal is sealed with polyester plastic bag without toxicity, the external is paperboard bucket and the net content is 25kg, or pack in accordance with the consumers' demands.
Transportation:
　　 Load and unload lightly, do not be exposed to the sun and rain. This is not dangerous thing, so it could be transported commonly.
Storage:
　　 At dry and cool place, take care of being wetted.