Pigments and dyes for plastics

Frequently Asked Questions

Which colorants are suitable for colouring plastic packaging?

Plastic packaging is coloured with pigment dispersions compatible with the packaging polymers: PET, PP, HDPE, PVC and polystyrene, among others. Luengo Color's Luengoprint CA range is formulated specifically for food contact and complies with the main international regulations on plastic materials: FDA (USA), Regulation (EU) 10/2011, and Swiss, Japanese (JHOSPA) and Chinese (GB9685-2016) legislation.

What type of pigments are used to colour plastics?

Plastics are coloured with pigment dispersions in carriers compatible with the polymer being used: polyol (for polyurethanes), DOTP or DINP plasticiser (for flexible PVC), polyetheramine (for polyurea) or DINCH (for phthalate-free applications). Luengo Color offers the Luengopol range, with five different families (DL, DO, DH, DI, PA), to cover all these variants without the need for solvents in the formulation.

Are plastic pigments resistant to UV radiation?

Yes. All products in the Luengopol range are made with pigments that are highly resistant to ultraviolet radiation and outdoor exposure, extending colour durability in weather-exposed applications. None of the products in the range contain solvents. This makes them especially suitable for plastics used in the automotive industry, architectural exteriors and other environments with high sun exposure.

Are Luengo Color's colorants compatible with PVC?

Yes. The Luengopol DO range (with DOTP plasticiser) and the Luengopol DI range (with DINP) are designed for use in flexible PVC. The DH range, formulated with DINCH (phthalate-free), is a suitable alternative when regulations or the end use require the absence of phthalates, as in toys, childcare articles or food-contact applications.

Can Luengo Color pigments be used to manufacture polyurethane foams?

Yes. The Luengopol DL range, formulated on polyether polyol, is compatible with polyurethane systems for the manufacture of foams, coatings, adhesives and sealants, as well as RIM (Reaction Injection Moulding) processes. The water content of the system must be kept below 0.05% to ensure optimum compatibility with the system's isocyanates.