PU Colorants and Pigment Dispersions for Polyurethane

What PU colorants are

PU colorants are concentrated pigment dispersions that are metered into the polyol (B-side) of a polyurethane system to colour the finished foam, elastomer, coating or moulded part. A pigment dispersion for polyurethane is made by grinding organic and inorganic pigments into a polyol-compatible carrier until the particles are fine and evenly spread. Good dispersion gives stronger colour, a cleaner shade and fewer specks.

Chemie Products has focused on speciality chemicals for polyurethane since 1996. Our colorants are made at Plant 1 near Bhiwadi, Rajasthan, and our solvent-based release agents and coatings are made at Plant 2 nearby.

The range

One colorant does not suit every machine or every part, so the range is split by how it is used.

• Liquid PU colorants for low-pressure and high-pressure machines.
• Colour pastes, which are thicker, for hand-mix and cast work.
• Dosing colours engineered for continuous metering on slabstock lines.
• UV-stable grades for exterior and automotive use.
• Rigid foam colorants, and colorants for polyurea coatings and PU or epoxy flooring.
• Fire-retardant colour pastes based on melamine and graphite for UL94 requirements.

Shade matching and consistency

We develop each shade against your approved sample, standard or Pantone or RAL reference, and keep the approved standard so that a repeat order matches the first. Controlled grind, tinting-strength and viscosity checks on every batch reduce shade drift on your line. Viscosity can be customised to suit your machine pumps, which helps keep dosing steady.

Typical values on our product pages are a guide only. Dosing level, viscosity and compatibility depend on your shade and your system, so we confirm them by trial and share the results with you.

Where PU colorants are used

Our PU colorants go into flexible and slabstock foam, footwear soles and chappals, automotive integral skin and trim, cast elastomers, PU toys, rigid foam and insulation panels, polyurea coatings, and PU and epoxy flooring. They are REACH and RoHS compliant. Packing runs from 5 kg cans for footwear trials to 200 kg drums for foam, with a 12 month shelf life when stored cool and dry in the original sealed container.

If something goes wrong on the line, such as a shade that drifts, a colorant that settles in the drum, or specks and streaks in the part, our troubleshooting guides explain the usual causes and fixes. When you are ready, send us your sample and system details for a quote.