What Is the Difference Between Masterbatch, Color Concentrate and Color Pellets?

Purchasing closed the quarter with an apparent saving: the new supplier had quoted "blue color pellets" at a price per kilogram far below that of the concentrate the plant had been using. The material arrived, the warehouse received it as a direct substitute and the supervisor programmed it into the feeder at the usual percentage. The first parts came out almost natural, with only a faint bluish tint, because what had arrived was precolored resin designed to be processed on its own, at one hundred percent. By the time the laboratory cleared up the confusion, a full shift of production had ended up in the grinder and the delivery to the customer had been pushed back a week.

Masterbatch and color concentrate name the same product: a high loading of pigment on a carrier resin, dosed at a small percentage. Color pellets are usually precolored resin, which is used without dilution.

The cost of buying a name instead of a specification

In the plastics industry, three terms circulate in quotes, technical data sheets and shop floor conversations as if they were interchangeable: masterbatch, color concentrate and color pellets. Two of them describe the same product; the third usually describes a very different one, which is used in another way and paid for under another logic. Confusing them is one of the most expensive causes of a wrong purchase, because the error only surfaces once the material is already in the hopper.

In our article on what masterbatch is, we explained how to choose it according to polymer, process and regulation. Here we clarify the vocabulary, because the same word in two quotes can hide two products with different uses, dosing and costs.

Three names, two products

The practical rule is simple. Masterbatch and color concentrate refer to a material that is blended with natural resin in a small proportion. Color pellets, in its most common use, refers to a resin that already carries the final color and goes into the machine as is. Both arrive as pellets and can look identical inside the bag; in the machine, their behavior is completely different.

Masterbatch and color concentrate: two names for the same product

Masterbatch is the technical term the industry adopted from English, and color concentrate is its descriptive equivalent; in Mexico both are used in the same sense. At Delta Pigmentos we use them as synonyms: we manufacture masterbatch, color concentrate for plastics. It is a pellet with a high loading of pigment, and sometimes of additives, encapsulated in a carrier resin compatible with the customer's resin.

A high pigment loading on a carrier resin

The logic of a concentrate is dilution. Because the pigment arrives concentrated, a small fraction of masterbatch colors a large quantity of natural resin. The exact proportion depends on the pigment loading, the shade, the thickness of the part and the target opacity, and it is defined during development with the technical data sheet and machine trials. In our article on dosing, we explain how that percentage translates into kilograms per shift.

Dosing at the machine throat

Masterbatch goes in together with the natural resin, ideally through a calibrated feeder at the machine throat, and it melts and blends inside the barrel. This means the processor controls the color with a variable of its own: the percentage. The processor can adjust the intensity within the limits the formula allows, use the same natural resin for several colors and change color simply by changing the bag of concentrate.

Color pellets: when the resin already arrives in the final shade

When a supplier offers "color pellets", it most often means precolored resin or a colored compound: a material in which the pigment is already incorporated at the final concentration of the part. It is loaded into the hopper without being blended with natural resin and leaves the machine in its definitive color.

Precolored compound: final color without dilution

Precolored resin is also manufactured by extrusion, with one fundamental difference: the pigment is incorporated into all the resin that will form the part. The color is fixed at the supplier's plant, and the processor simply processes it. That characteristic removes the dosing variable from the plant and, at the same time, removes the room for adjustment: if the shade drifts, the correction is in the hands of the compound supplier.

An ambiguous term in the market

The complication is that "color pellets" is also used colloquially to name any colored material in pellet form, including masterbatch. Some distributors use it as a synonym for concentrate and others reserve it for precolored resin. That is why the name alone is insufficient to know what is being purchased, and the useful question goes straight to use: whether that material is blended with natural resin or processed on its own.

When each option suits your plant

The choice between concentrate and precolored resin depends on several operating variables. Each one carries a different weight depending on the line, and the right decision for one plant may be the wrong one for another.

Cost per part and color control

Masterbatch has a higher price per kilogram, because it concentrates the pigment, and it is used in a small proportion; the natural resin that accompanies it makes up the bulk of the material. Precolored resin is paid for in full with the color included, and its price reflects the extrusion of the entire mass. That is why a fair comparison is made on cost per finished part. In terms of color control, a concentrate allows adjustment at the plant and the same color to be applied on different resins; precolored resin delivers a fixed color that depends entirely on the supplier's consistency.

Inventory and volume

With masterbatch, the warehouse stocks one or a few natural resins and a bag of concentrate per color. With precolored resin, every color is a separate resin in inventory, with its own purchase volume and its own risk of becoming slow-moving stock when demand shifts. For plants that run many colors on the same resin, a concentrate usually simplifies the warehouse; for a high-volume part in a single color, precolored resin can justify its cost. At Delta Pigmentos, the minimum order for a developed color in masterbatch is 100 kg, and given the logic of dilution, that quantity colors a far larger volume of resin.

Dosing and plant discipline

A concentrate requires a calibrated feeder, a percentage written on the production order and verification by weight at the start of every shift. Precolored resin removes that task, and it is useful in plants with limited dosing equipment or for parts with a very tight color tolerance on lines where dosing varies between shifts. When the plant already doses reliably, masterbatch adds flexibility and maintains consistency.

How to confirm with your supplier what you are buying

The safest way to avoid the scenario described at the beginning is to request the complete specification before the first purchase order. These are the questions we recommend asking any color supplier, in writing:

• Use of the material: whether it is dosed diluted over natural resin or processed on its own, at one hundred percent.

• Recommended dosing: the figure and the basis on which it is expressed, on the blend or on the resin.

• Carrier resin or base resin: which one it is and which polymers and grades it is compatible with.

• Process and temperature: which processes it is formulated for and in what temperature range it works.

• Food contact: whether the technical data sheet declares it and under which reference.

• Lot control: how the color of every production run is measured and against which standard it is released.

A quote that answers these six questions allows offers to be compared by cost per part and by risk, and it puts the correct use of the material in writing for the warehouse, the supervisor and the laboratory.

How we work with color at Delta Pigmentos

At Delta Pigmentos we have been manufacturing masterbatch in our own plant for 24 years, and every concentrate ships with its technical proposal: product, concentration and recommended process. For commonly used shades, we offer a Basic Color Line of 30 masterbatches for HDPE, LDPE and PP; when the shade is a brand color, we match it in the laboratory against your physical reference, your photograph or your Pantone code, as an authorized Pantone partner.

If you work with precolored resin today and would like to evaluate whether a concentrate suits your operation, we help you compare the two routes with the data for your part: volume, number of colors, dosing equipment and color tolerance. You validate the shade on your own machine before committing volume, and our ISO 9001-2015 certified procedures hold that shade on the orders that follow.

Frequently asked questions

Can I use precolored resin as if it were masterbatch?

Dosed at a low percentage, precolored resin barely tints the blend, because its pigment is already diluted to the level of the final part; it is designed to be processed on its own. The reverse case also fails: a masterbatch processed without dilution produces an oversaturated shade, wastes pigment and can affect the properties of the part.

Is a higher-concentration masterbatch more economical?

Frequently, yes, when compared on cost per part. A concentrate with a higher pigment loading reaches the same shade with fewer kilograms per ton of resin. It is advisable to validate it with a trial on your machine, because dispersion and the carrier resin also influence actual performance.

How do I know whether the quote I received is for a concentrate or for precolored resin?

Check the recommended dosing on the technical data sheet. A concentrate indicates a usage percentage over natural resin; a precolored resin is specified for direct use. If the data sheet omits that information, request it in writing before issuing the purchase order.

At Delta Pigmentos we have been manufacturing masterbatch, color concentrate for plastics, for 24 years, with our own laboratory and ISO 9001-2015 certified procedures. If you received a quote for "color pellets" and need to confirm which product it is, or you would like to compare concentrate against precolored resin for a new part, write to us on WhatsApp with your polymer, your process, your volume and your shade reference; we will respond with a technical proposal. Every request is reviewed within the following 24 business hours.