Cast urethane color chart

The standard PU elastomer palette

Black comes first: carbon black dispersions in a polyether polyol or a plasticizer carrier, for an opaque solid black. After it are the 35 standard colors REPI formulates for elastomeric polyurethanes. We make all of them in Hermon, Maine as REPI's authorized formulator in North America, from REPI base colors. Each one goes into cast polyurethane by mass coloration of the polyol, or metered straight into the mixing head.

Every swatch shows the tone and strength of the color at a 1% let-down. The final shade moves with the elastomer system and the loading, so treat this chart as a way to pick a direction and a name, and order a sample to approve against.

Swatches are screen renderings of the color panels and vary from monitor to monitor. RAL and Pantone codes are the nearest reference for each shade. Pantone is a trademark of Pantone LLC.

Shades that are not on the chart

Any shade outside this chart gets matched. Send a RAL or Pantone code, a chip, or a physical part, and we build the color in your system. The match and the sample are free, and a match takes about a week. The codes we have already matched are on the shade reference.

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Carriers, packs and lead time

For cast urethane the colors come in a low-viscosity plasticizer or a polyether polyol carrier. The carrier is chosen for the system: polyol where the color has to react in, as in spray polyurethane and foam. Epoxy, Benzoflex and vegetable oil carriers are available for other systems. Liquid color for cast urethane covers how to choose.

The chart is also available as REPI's original color book: open the PDF.

Frequently asked questions

Where can I buy liquid color for cast urethane?

From P.A.T. Products. We make liquid color for cast urethane and urethane rubber in Hermon, Maine: carbon black and 35 standard colors, in a polyether polyol or a plasticizer carrier, plus any RAL or Pantone shade matched to order. We sell by the pail, drum or tote with a one-pail minimum, commercial orders ship in about a week, and samples are free.

Who sells black pigment for cast urethane and urethane rubber?

P.A.T. Products does. We make carbon black dispersions for cast urethane and polyurethane rubber in Hermon, Maine, in polyether polyol and plasticizer carriers, for an opaque solid black. The polyether polyol black is a stock item, sold from a 5 kg pail up to drums and totes, and a black sample is free.

Are these stock colors?

They are REPI's standard formulations for polyurethane elastomers, so there is no match to run. Order by color name, and a commercial order ships in about a week.

How close is the screen swatch to the real color?

Close enough to choose a direction, not close enough to approve. Each swatch is a screen rendering of a panel colored at a 1% let-down, and monitors vary. The shade in your part also depends on the elastomer system and the loading, so approve against a sample run in your own system.

What let-down are the swatches shown at?

1% by weight. Your final loading depends on the opacity the part needs and on the system, and we can suggest a starting point when we send the sample.

Do you supply black for cast urethane?

Yes. P.A.T. Products makes carbon black dispersions for cast urethane in Hermon, Maine, in polyether polyol and plasticizer carriers, for an opaque solid black. The polyether polyol black is a stock item. If you are replacing a Vibrantz PU-Black grade or an American Colors UC black, send us the grade name or a cured part, and we will send a free sample with its TDS and SDS. P.A.T. Products does not sell those brands.

Who can second-source liquid color for cast urethane in the US?

P.A.T. Products can. We make liquid color for cast urethane in Hermon, Maine, in a polyether polyol or a plasticizer carrier, and we match a color you already buy from a cured part or a wet sample. If you run Avient Stan-Tone, American Colors, Vibrantz Plasticolors or Vortex Liquid Color products, send the grade you use and a sample, and we will match your specification and send a free sample. P.A.T. Products does not sell those brands. The minimum order is one pail, and lead time is about a week.

Can you match a polyether polyol dispersion I already use?

Yes. P.A.T. Products builds polyether polyol dispersions for cast urethane to your specification, formulated to the hydroxyl number of your system. Common polyol lines in cast urethane include Avient Stan-Tone ET, American Colors UC, UCF and UCG, Vibrantz Plasticolors DL and Vortex VLC Series 100. P.A.T. Products does not sell those brands. Tell us the grade, or its carrier molecular weight and OH number, and we will match your specification and send a free sample, with the measured color reading on the certificate of analysis for every batch.

My color is not on the chart. Can you make it?

Yes. Send a RAL or Pantone code, a chip or a physical part and we match it in your system. The match and the sample are free, and a match takes about a week.

Which carrier should I use?

For cast urethane, a low-viscosity plasticizer or a polyether polyol. Polyol is the choice where the color has to react into the system, as in spray polyurethane and foam. Tell us the system and we will pick the carrier with you.

Cast urethane color lines by maker

These are trademarks or product names of their respective owners. P.A.T. Products does not sell them; we match your specification.

For a line that has been discontinued or is hard to buy, see replacing a liquid colorant you can no longer buy.