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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Pigment Violet 23 (Carbazole Violet) | CAS 6358-30-1

A dioxazine violet pigment for coating formulations, selected through reference shade, tinting response and dispersion in the intended binder. Particle-related behaviour and defined fastness tests are more useful than a generic purity claim.

CAS6358-30-1
Molecular formulaC34H22Cl2N4O2
Molecular weight589.5 g/mol

Product overview

Pigment Violet 23 belongs to the polycyclic dioxazine pigment family and is also known as carbazole violet. CAS 6358-30-1 and Colour Index 51319 identify the colourant chemistry, while commercial grades can differ in shade and formulation behaviour. The purchasing decision therefore needs more than a molecular identity or a powder-colour description. A useful specification defines the reference standard, binder, pigment loading and preparation method used to judge full shade and tint. Dispersion quality, coarse particles or agglomerates, and formulation-relevant volatile matter should be evaluated under agreed conditions. Any heat, light or weather-resistance requirement should be tied to a named application test.

Chemical identity

Chemical name
Pigment Violet 23 (Carbazole Violet)
CAS number
6358-30-1
Molecular formula
C34H22Cl2N4O2
Molecular weight
589.5 g/mol

Application context

Pigment Violet 23 is used as a violet colourant in decorative and industrial coatings. Its coating applications include solventborne and waterborne paints, universal stainers and powder coatings, with grade selection matched to the binder and dispersion process. The pigment is incorporated into a binder system, where its shade, tinting response and dispersion characteristics determine the result obtained in the finished film.

A coating enquiry should identify the binder and application method, then define the shade target against a reference panel or retained standard. Full-shade and reduced-tint comparisons answer different questions and should be described separately. Dispersion evaluation can include fineness and the presence of coarse material under the buyer’s agreed method. Oil absorption and volatile matter may also enter the specification where relevant to formulation. Performance testing should reproduce the intended film preparation and exposure conditions.

Chemistry and synthetic role

The extended fused-ring dioxazine structure provides the pigment’s colourant identity. The supplied pigment is evaluated as a dispersed solid in a coating system, so particle and dispersion characteristics complement chemical identification.

Quality review

Define shade comparison

Agree full shade, tint ratio, binder, film preparation and the retained reference used for instrumental or visual comparison.

Assess dispersion and coarse material

Specify dispersion conditions, fineness or particle assessment and the treatment of agglomerates relevant to the coating.

Tie fastness to test conditions

Set heat, light, weather or solvent-bleed tests according to the application and record the specimen preparation.

Control formulation-relevant residue

Include volatile matter or oil absorption only with a defined method and acceptance requirement.

Preparing a specification

Request C.I. Pigment Violet 23, CAS 6358-30-1, with a target shade and reference standard. Define binder, tinting comparison, dispersion test and required fastness assessments; specify volatile matter or oil absorption where needed.

Packaging and storage

Confirm packaging and closure suitable for protecting the selected pigment grade during storage and handling. Net weight, storage and transport are agreed against the actual SDS and order.

Documentation

Request the proposed grade’s technical data, COA and SDS. Confirm availability of colour-comparison, dispersion and application-test results and a representative sample for formulation trials.

Procurement questions

Does the CAS determine one fixed violet shade?

The chemical identity is common to multiple grades. Specify the required reference shade and comparison conditions.

Is a powder sample enough to approve colour?

Evaluate a dispersion or film in the intended binder, including the agreed full-shade and tint comparisons.

Which fastness value should enter the specification?

Use the test relevant to the application, with exposure conditions and specimen preparation defined.

Technical sources
  1. PubChem CAS-resolved identity, CID 61387NCBI / National Library of Medicine
  2. Sudaperm Violet 2940C technical data sheetSudarshan Chemical Industries
  3. Sudaperm Violet 2941C technical data sheetSudarshan Chemical Industries