Applications of Pigment Red 31 in Industrial Manufacturing

Pigment Red 31 finds specialized roles across selected industrial sectors where performance, consistency, and color quality remain critical. As an established pigment produced to strict QC parameters, we support formulation chemists, process engineers, and end-user OEMs in demanding applications that require repeatable color strength, process stability, and regulatory compliance.

1. Solvent-Based Printing Inks for Flexible Packaging

Industrial-scale converters rely on Pigment Red 31 to achieve vivid magenta and red hues in nitrocellulose, polyamide, and polyurethane-based liquid inks for gravure and flexographic printing on flexible films such as BOPP, PET, and LDPE. Our pigment helps downstream formulators attain high color strength with good flow and dispersibility, enabling fast printing speeds and low plate contamination. Technicians adjust pigment loading based on substrate, press speed, and target color strength, with shade control validated via QC protocol. We facilitate direct dispersion in ink bases or predispersed concentrates, delivering reliable batch-to-batch chromaticity for critical branding and high-visibility product packaging.

Industry compliance standards

• Swiss Ordinance SR 817.023.21 (Annex 10: Printing Inks)
• EuPIA GMP Guideline for Printing Inks
• REACH Annex XVII (Restrictions on certain hazardous substances in pigments)
• AP(89)1 Council of Europe Recommendation for materials in contact with food

Typical usage ratio

• 2%–6% by total ink formulation weight, adjusted for target color intensity and print density. Higher loadings for gravure, lower for flexographic set-ups.

Downstream process integration

• Introduction during pigment grind or as a predispersed paste in the let-down stage. Compatibility check with other ink additives (resins, plasticizers, anti-blocking agents) as required by QC.

Final product types

• Printed snack food pouches
• Confectionery wrappers
• Personal care sachets (wet wipes, lotions)
• Laminated labels

2. Decorative Water-Based Emulsion Paints

Paint manufacturers employ Pigment Red 31 to achieve consistent color matching in interior wall and ceiling emulsions. The pigment blends well with acrylic dispersions, allowing stable dispersion and minimal flotation or flooding. Our product meets critical performance benchmarks for lightfastness and resistance to alkali when incorporated at specified ratios. Formulators select suitable dispersing agents and stabilize pH to prevent color drift and maximize shelf life. Full QC traceability from lot to blend enables compliance with construction certainty and contract color standards.

Industry compliance standards

• EN 13300 (Paints and varnishes—Coating materials and coating systems for interior walls and ceilings)
• ISO 787-25 (Determination of lightfastness of pigments)
• Directive 2004/42/EC (VOC content limit for decorative coatings)
• ASTM D5067 (Pigment identification and performance in paints)

Typical usage ratio

• 0.2%–2% pigment by total formula weight depending on tint base, target opacity, and color shade (pastel to deep).

Downstream process integration

• Added during high-shear premix and processed through bead milling for uniform particle distribution before final let-down.

Final product types

• Interior emulsion wall paints
• Ceiling coatings
• OEM spray-applied basecoats in modular housing
• Contractor-grade color tinted paints

3. Rubber and Plastic Masterbatches

Polymer compounders use Pigment Red 31 to deliver strong red coloration in both thermoplastic masterbatch pellets and custom rubber compounds. The pigment maintains its chroma and stability during high-temperature extrusion, allowing processors to achieve accurate corporate or regulatory color references in final molded articles. Technicians select the optimal pigment concentration taking into account polymer compatibility, weathering requirements, and economic considerations. The dispersion quality critically impacts polymer melt flow and final product appearance.

Industry compliance standards

• EU Directive 2011/65/EU (RoHS compliance for polymers in electronics and appliances)
• FDA 21 CFR 178.3297 (Colorants for polymers in food contact, when applicable and purity conditions met)
• ISO 11469 (Identification and marking of plastics—Colorants disclosure)
• Automotive OEM Material Standards (e.g., VW TL 52870, according to project scope)

Typical usage ratio

• 0.3%–2.5% by total polymer weight; high color concentrate masterbatches may reach up to 20% pigment, based on final let-down ratio in the target application.

Downstream process integration

• Dispersed in PE/PP/PS/EVA carriers through twin-screw extrusion or Banbury mixing for rubber; downstream processors dilute masterbatch at molding or extrusion step.

Final product types

• Consumer product casings (appliances, electronics)
• Automotive interior and trim profiles
• Stationery plastics (folders, clips, containers)
• Rubber gaskets and sealing strips

4. Artist and Educational Tempera Colors

Paint and art supply producers incorporate Pigment Red 31 to provide vivid red hues in safe, washable tempera and poster color systems. Our pigment is refined for clean dispersion and minimal binder separation, supporting process controls in batch mixing, filtration, and filling. Formulators check compliance with heavy metal content and allergen-free status. The pigment supports high pigment loadings without affecting flow properties or stability, important for consistency in large educational supply runs.

Industry compliance standards

• EN 71-3 (Toy Safety—Migration of certain elements)
• ASTM D4236 (Labeling of art materials for chronic hazard)
• CPSIA (Consumer Product Safety Improvement Act for school/art products in the US)
• ISO 8124-3 (Safety of toys—Migration of certain elements, applicable to paint on toys)

Typical usage ratio

• 3%–8% pigment by wet formulation weight, modulated based on binder system and required opacity/saturation for end use.

Downstream process integration

• Wet dispersion phase with temperature and pH monitoring; pigment ground in water and binder, then homogenized before packaging in tubes, jars, or bulk pails.

Final product types

• School-grade tempera paints
• Poster and display colors
• Children’s art kits
• Amateur and educational brush paints

5. Industrial Paper Coloring and Coating

Paper mills and specialty paper coaters use Pigment Red 31 to impart strong red shades in colored tissues, wrapping papers, and printed decor substrates. The pigment resists bleed and migration during calendering and sizing. Operators add the pigment as an aqueous dispersion into the stock or surface sizing phase, finely adjusting dosage to account for pulp absorbency and final sheet opacity. The pigment enables well-defined color reproduction, supporting downstream high-speed printing and end-user conversion.

Industry compliance standards

• EN 646 (Color fastness of dyed paper—Resistance to water and bleed)
• ISO 4046 (Paper, board and pulps—Vocabulary: colorants in papers)
• BfR Recommendation XXXVI (Paper and board for food contact, pigment purity and migration limits)
• FDA 21 CFR 176.170 (Color additives in paper for food contact, if used in such applications)

Typical usage ratio

• 0.1%–1.2% pigment by dry pulp weight for solid-color; for surface coatings, typically 0.2%–1.5% based on coating weight and coverage.

Downstream process integration

• In-line dispersion into pulp or coating color during wet-end processing, or as a supplementary pigment in surface finishing baths prior to drying and calendering.

Final product types

• Colored wrapping papers
• Printed tissue papers
• Gift and party decor sheets
• Food-contact napkins (where authorized)