Ultramarine Blue- FAQs

Pigment Blue 29 (PB29) is the Colour Index designation for Ultramarine Blue. It is an inorganic blue pigment used in applications including plastics, masterbatch, paints, coatings, inks, textiles, and other industrial products.

C.I. 77007 is the Colour Index number assigned to Ultramarine Blue, also known as Pigment Blue 29. Buyers and manufacturers may use PB29, CI 77007, or Ultramarine Blue when specifying this pigment.

The CAS number commonly associated with Ultramarine Blue / Pigment Blue 29 is 57455-37-5. SKU Pigments lists C.I. 77007 and CAS No. 57455-37-5 for its Ultramarine Blue products.

Yes. Ultramarine Blue is widely used in plastics because of its good heat stability, lightfastness, dispersion characteristics, and dimensional stability. It can be used across various polymer systems, including polyolefins and other thermoplastics, depending on the grade and processing conditions.

Yes. Ultramarine Blue is suitable for masterbatch applications and is used to achieve consistent blue coloration and blue undertones in plastic products. SKU Pigments describes its Ultramarine Blue as heat fast, light fast, and easy to disperse, with a typical particle size of approximately 1–2 microns (D50) for its masterbatch product.

SKU Pigments specifies a heat stability of approximately 340°C for its Ultramarine Blue pigment. Actual performance can vary depending on the polymer, processing time, formulation, stabilizer system, and pigment grade, so application-specific testing is recommended.

Standard Ultramarine Blue has poor acid resistance. Acid exposure can affect the pigment and may cause loss or change of blue shade. For applications such as PVC where acidic conditions may occur during processing, an acid-resistant Ultramarine Blue grade should be selected.

SKU Pigments lists Ultramarine Blue grades with a typical particle size in the range of approximately 1–2 microns, with some product specifications showing broader ranges depending on the application. Fine particle size helps support dispersion and uniform color development in plastics and masterbatch.

The recommended dosage depends on the polymer, desired shade, pigment strength, opacity or transparency requirement, processing method, and formulation. Therefore, there is no single dosage that is correct for every plastic application. SKU Pigments can recommend a suitable dosage based on the polymer, end-use application, and required shade strength. Laboratory trials are recommended before commercial production.

For PVC applications, the appropriate grade should be selected based on the processing conditions and the potential for acidic conditions during processing. Where acid sensitivity is a concern, an acid-resistant Ultramarine Blue grade is recommended to minimize shade loss or color change.

The main difference is the color undertone. Red Shade Ultramarine Blue produces a warmer, reddish-blue appearance, while a Green Shade grade produces a comparatively cooler, greener blue. The correct shade depends on the final color target and the polymer or application. PB29 is generally recognized for its relatively redder blue character compared with phthalocyanine blue.

Certain Ultramarine Blue grades are used for food-contact plastic applications, and SKU Pigments states that its Ultramarine Blue is approved for sensitive applications including food-contact plastics. However, food-contact compliance is grade- and regulation-specific. The appropriate regulatory documentation and compliance status should always be confirmed for the intended country, polymer, and end-use application before commercial production.

SKU Pigments currently lists packaging options of 5 kg, 10 kg, 25 kg, 50 kg, and 500 kg, depending on product and order requirements. Custom or application-specific packaging can be discussed with the sales team.

Yes. Samples are available from SKU Pigments. You can contact the team with your application details, required polymer or end use, desired shade, and approximate consumption so the appropriate Ultramarine Blue grade can be recommended.