Pyromellitic dianhydride

Pyromellitic dianhydride
Names
	Preferred IUPAC name 1H,3H-Benzo[1,2-c:4,5-c′]difuran-1,3,5,7-tetrone
Identifiers
CAS Number	89-32-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	21106533;
ECHA InfoCard	100.001.726
EC Number	201-898-9;
PubChem CID	6966;
RTECS number	DB9300000;
UNII	2Z22T30QZQ ;
CompTox Dashboard (EPA)	DTXSID1026536 ;
	InChI InChI=1S/C10H2O6/c11-7-3-1-4-6(10(14)16-8(4)12)2-5(3)9(13)15-7/h1-2H Key: ANSXAPJVJOKRDJ-UHFFFAOYSA-N;
	SMILES C1=C2C(=CC3=C1C(=O)OC3=O)C(=O)OC2=O;
Properties
Chemical formula	C10H2O6
Molar mass	218.120 g·mol−1
Appearance	White solid
Density	1.68 g/cm3
Melting point	283 to 286 °C (541 to 547 °F; 556 to 559 K)
Boiling point	397 to 400 °C (747 to 752 °F; 670 to 673 K)
Solubility in water	Hygroscopic
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H317, H318, H334
Precautionary statements	P261, P272, P280, P285, P302+P352, P304+P341, P305+P351+P338, P310, P321, P333+P313, P342+P311, P363, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Pyromellitic dianhydride (PMDA) is an organic compound with the formula C₆H₂(C₂O₃)₂. It is the double carboxylic acid anhydride that is used in the preparation of polyimide polymers such as Kapton. It is a white, hygroscopic solid. It forms a hydrate.