Perylene Pigment Black 31 (PBk31) for Coatings, Plastics and Inks

Pigment Black 31 (PBk31, CAS 67075-37-0) is a high-performance perylene-based organic black pigment developed for durable coatings, plastic coloration and specialty ink applications.

It provides a deep black shade, excellent lightfastness, good thermal stability and strong resistance to migration and common chemicals. Its near-infrared transmission characteristics also make it suitable for evaluation in selected thermal-management and functional optical systems.

Lightfastness typically rated Grade 7–8
Heat stability up to $25 0°C$
Deep black shade with high tinting strength
Low migration in suitable polymer and coating systems
Good resistance to weathering and common chemicals
Suitable for selected coating, plastic and ink formulations
Near-infrared transmission characteristics for functional applications
REACH and RoHS documentation available upon request
Manufactured under an ISO 9001 quality management system

Pigment Black 31 Specifications:

Pigment Black 31 adheres to strict quality standards, with consistent technical parameters to ensure reliable performance in every application. Below are the key technical details (for full TDS, please contact our team):

Product Name: Perylene Pigment Black 31
C.I. Name:Pigment Black 31
CAS No.: 67075-37-0
Appearance: Fine jet‑black powder
Heat Stability: Up to 250°C
Lightfastness: Grade 7-8
Tinting Strength: 100±5%
Moisture: ≤1.0%
Solid Content: ≥99.0%

These values are typical product data and should not be interpreted as guaranteed specifications unless otherwise stated in the product specification or certificate of analysis. Actual performance may vary with the test method, resin, pigment concentration, film thickness and processing conditions.

Performance Characteristics:

Excellent Lightfastness and Weather Resistance

PBk31 provides excellent resistance to light exposure and weathering, making it suitable for selected exterior coatings and plastic applications. Final outdoor durability depends on the complete formulation, including the binder, stabilizer package, pigment concentration and coating thickness.

Heat Stability up to $25 0 °C$

The pigment maintains good color stability during many coating-baking and polymer-processing operations. Maximum processing temperature and residence time should be verified in the intended resin or polymer system.

Low Migration and Chemical Resistance

PBk31 offers low migration and good resistance to common acids, alkalis and industrial chemicals in suitable formulations. Application testing is recommended where prolonged chemical contact or demanding migration requirements are involved.

Near-Infrared Transmission Characteristics

Unlike conventional carbon black, PBk31 allows part of the near-infrared radiation to pass through the pigmented layer. When formulated over a white or IR-reflective substrate, this characteristic can help improve system-level solar reflectance and reduce heat build-up in dark-colored surfaces.

The resulting TSR and thermal performance depend on pigment loading, film thickness, substrate reflectance, binder and test method. Contact us to evaluate PBk31 in your coating system.

Application:

Thanks to its versatile properties, PBk31 is widely used in various industries, catering to both decorative and functional coloring needs:

Automotive and Industrial Coatings

PBk31 can be evaluated in automotive OEM and refinish coatings, metal coatings, appliance coatings and industrial equipment finishes.

It provides:

Deep and durable black coloration
Excellent lightfastness
Good resistance to weathering and chemicals
Thermal stability suitable for selected baking processes
Low migration in compatible coating systems

Final suitability should be confirmed according to the binder, curing temperature, film thickness and required durability standard.

Engineering Plastics and Polymer Coloration

PBk31 can be evaluated in PP, PE, PVC, ABS, PC, PMMA, PET and other polymer systems. Typical applications include:

Automotive plastic components
Electrical and electronic housings
Consumer products
Molded industrial components
Dark-colored functional plastic parts

Compatibility, dispersion, dimensional requirements, processing temperature and migration resistance should be confirmed in the final polymer formulation.

Specialty Printing Inks

PBk31 may be used in selected solvent-based, water-based and UV-curable ink systems for:

Industrial printing
Durable marking
Specialty packaging inks
Functional printing
IR-readable or optically functional ink development

Its suitability depends on the binder, solvent system, dispersion method, printing process, film thickness and target wavelength. Laboratory evaluation is recommended before commercial use.

4. Thermal-Management Coatings

The NIR transmission characteristics of PBk31 can be used to formulate dark-colored topcoats over white or IR-reflective substrates.

Compared with conventional carbon black formulations, properly designed PBk31 systems may provide:

Higher system-level solar reflectance
Lower solar heat build-up
Improved thermal management of dark surfaces
Deep black visual appearance with functional NIR performance

The final result depends on the complete coating construction rather than the pigment alone.

5. Functional Optical Materials

PBk31 can be evaluated in applications that require a dark appearance in the visible spectrum combined with controlled near-infrared transmission.

Potential applications include:

Functional plastic covers
Sensor-related components
NIR-readable printing
Optical films and dark-colored functional layers

Selection should be based on the required wavelength, pigment loading, optical path length and substrate properties.

Dispersion and Processing Guidance

For optimum colour development, PBk31 should be dispersed using a suitable dispersing agent and sufficient shear. The recommended dosage and processing conditions depend on the binder, polymer, pigment concentration and target application.

We can provide application guidance and laboratory samples for evaluating dispersion, colour strength, viscosity, heat stability, migration and weather resistance in the final system.

Why Choose Nichwell Perylene Pigment Black 31?

Controlled Product Quality

Production and quality control are managed under an ISO 9001 quality system. Key parameters such as appearance, tinting strength, moisture and heat stability are monitored to support consistent supply within established specification tolerances.

Application-Oriented Support

Our technical team can assist with pigment selection, dispersion guidance, processing recommendations and initial formulation evaluation.

Samples and Technical Documents

Laboratory samples, TDS, SDS, COA and available compliance documents can be supplied to support qualification and purchasing decisions.

Flexible Packaging and Global Delivery

Standard packaging options include 1 kg, 10 kg, 20 kg and 40 kg packs. Alternative packaging may be available depending on order quantity and transportation requirements.

International delivery options include express, air and sea freight, subject to destination and shipment requirements.

FAQ

What is the heat resistance of Perylene Black 31?

Pigment Black 31 offers heat stability of up to

25 0℃

under the stated test conditions. Actual suitability depends on the polymer or binder, processing duration, pigment concentration and equipment conditions. Evaluation in the final formulation is recommended.

What is the lightfastness of PBk31?

PBk31 typically provides Grade 7–8 lightfastness under the stated test conditions. Outdoor durability also depends on the binder, coating thickness, stabilizers, pigment loading and exposure environment.

Is Perylene Black 31 suitable for outdoor use?

PBk31 can be used in selected outdoor coatings and plastic applications requiring high lightfastness and weather resistance. The final coating or polymer system should be tested according to the intended exposure conditions and service-life requirements.

Is PBk31 suitable for plastics?

PBk31 can be evaluated in PP, PE, PVC, ABS, PC, PMMA, PET and other compatible polymer systems. Heat stability, dispersion, shade, migration and mechanical properties should be verified in the final formulation.

Is Pigment Black 31 an IR-reflective pigment?

PBk31 is more accurately described as having near-infrared transmission characteristics rather than being inherently highly reflective. When it is used over a white or IR-reflective substrate, NIR radiation can pass through the dark-colored layer and be reflected by the underlying surface, improving the reflectance of the complete system compared with conventional carbon black.

Can you provide samples and technical documents?

Yes. Laboratory samples, TDS, SDS, COA and available compliance documents can be provided. Please share your application, resin or binder, processing temperature and target performance so that we can recommend an appropriate evaluation approach.

Do you offer customized products?

Application-specific particle size, surface treatment or dispersion options may be available, subject to technical feasibility, order quantity and qualification requirements.