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Description and features

The curing mechanism between Vicura MC-68 (Pyromellitic Acid Diphenyl Imidazoline Salt) and the epoxy resin is complex. Two parallel processes are taking place; direct reaction between the imidazoline and the epoxy group and homopolymerization of the epoxy resin that is catalyzed by Vicura MC-68. Compared to most of the powder coating systems where the optimal ratio between the crosslinker and the binder is close to the stoichiometric one, in the case of Vicura MC-68 the optimal ratio is generally determined empirically. For epoxy resins that are typically used for powder coatings (epoxy equivalent weights between 700 – 1000) amounts of 8,0 – 10,0 % of Vicura MC-68 are recommended as good starting points.

  • Also available with added calcium carbonate (Vicura MC-68L)


Europe: Vicura MC-68 is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 20 KG carton boxes.

United States, Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

This substance (CAS: 54553-90-1) has been registered under
REACH (EC) 1907/2006.

Product Identification

CAS number54553-90-1
EC number259-224-2
HS code2933 2990 90


Appearance White very fine powder
Assay ≥99.00 %
Melting range 220 – 230 °C
Water content ≤0.50 %


Vicura MC-68 (Pyromellitic Acid Diphenyl Imidazoline Salt) is an organic salt of polycarboxylic acid and cyclic amidine. It is used as a crosslinker in manufacturing of matt epoxy and polyester/epoxy hybrid powder coatings. Vicura MC-68 has more pronounced matting effect compared to Vicura MC-55. When used as a single crosslinker in formulating matt epoxy powder coatings gloss levels lower than 10 (Gardner 600) can be obtained. The gloss can be increased by partially replacing Vicura MC- 68 with the “high gloss crosslinker” Vicura MC-31. The desired ratio between the two crosslinkers should be determined experimentally. In polyester/epoxy powder coatings the gloss level in the range of 10 – 70 (Gardner 600) is controlled by replacing part of the polyester with Vicura MC-68, while at the same time increasing the amount of epoxy resin. The curing reaction between Vicura MC-68 and the epoxy groups starts at temperatures above 180 °C. By increasing the temperature the curing cycles are getting quickly in the range typical for other thermosetting powder coatings


Available packaging: 20 KG carton boxes.
Special packaging is available on request.


Store Pyromellitic Acid Diphenyl Imidazoline Salt in a cool, dry and well-ventilated area and in line with legal requirements.


A Material Safety Data Sheets (MSDS) is available for Vicura MC-68 and all other products supplied by Vesta Chemicals BV.

An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Molecular and structural information

Molecular formula C19H16N2O8
Molecular weight 400.34 g/mol
Smiles notation C1CC(C(C1)OC(=O)C2=CC=C(C=C2)[N+](=O)[O-])OC(=O)C3=CC=C(C=C3)[N+](=O)[O-]
Structural formula 54553-90-1

Physicochemical information

Boiling point >201 ºC @ 1 atm
Bulk density 1.540 kg/m3
Flash point >200 ºC @ 1 atm
Melting point >210 – < 235 ºC at 1 atm
Partition coefficient (log Pow) 1 @ 25 ºC
Solubility in water 3 g/l @ 20 ºC / PH 2.9
Vapor pressure (MGM) 0 kPa @ 25 ºC
Pyromellitic Acid Diphenyl Imidazoline Salt | CAS: 54553-90-1 | Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.