Black masterbatch vs compound vs liquid color: how to choose
If you need a black part, you have three routes: dose masterbatch into natural resin, buy fully compounded black resin, or meter liquid colour at the machine. Each has a place. Here is how they actually compare on cost, quality and day-to-day hassle.
By Zoe Lin, Export Manager, E-LUCK (Guangdong Yijuyuan Plastic Industry Technology Co., Ltd.)
1. The three options, plainly
- Masterbatch — concentrated pigment in a carrier resin, dosed into natural polymer at the machine, usually 1–10%.
- Compound — fully compounded black resin that arrives ready to process. No dosing step; you are buying the finished material.
- Liquid color — pigment dispersed in a liquid carrier, metered into the melt by a pump.
All three produce a black part. They differ in what you pay for, what you handle, and how much control you keep.
2. Cost per finished part
This is where the comparison usually gets done badly, because the three are quoted in different units.
| Masterbatch | Compound | Liquid color | |
|---|---|---|---|
| Price unit | per kg of masterbatch | per kg of finished resin | per kg of colour |
| What you also pay for | natural resin + dosing | nothing extra | natural resin + pump |
| Typical cost position | Lowest for volume | Highest per kg | Low at very high volume |
| Inventory | One natural resin + one additive | A separate grade per spec | One natural resin + colour |
Masterbatch usually wins on total cost for anything above small volumes, because you keep buying one natural resin in bulk and only dose what you need. Compound costs more per kilo but removes a process step. Liquid colour becomes attractive at very high, continuous volumes where the pump cost is amortised.
3. Dispersion and quality
Compound is made on a compounding line with high shear, so dispersion is generally excellent and very consistent. That is why it is common in demanding applications.
Masterbatch dispersion depends on two things: how well the masterbatch itself was compounded, and whether your machine provides enough distributive mixing at your let-down. A well-made masterbatch on a correctly set line gives results very close to compound — which is why masterbatch is the default for pipe, film and moulding worldwide.
Liquid colour disperses very well in the melt but adds a liquid handling step and can affect the process window.
4. Handling, dust and changeover
- Masterbatch — pellets, clean to handle, easy to store, changeover is a purge and a dose change. Most flexible option.
- Compound — simplest to run, but you hold inventory per specification, and any spec change means a new material qualification.
- Liquid color — needs pump maintenance, can spill, and shelf life matters. Excellent for fast colour changes at volume.
5. Which one fits which job
- High volume, one spec, demanding quality — compound is worth the premium.
- Multiple products, multiple polymers, cost-sensitive — masterbatch. One natural resin, one additive, dose to suit.
- Very high continuous volume with frequent changes — liquid colour earns its pump.
- Outdoor products needing UV protection — any of the three can work, but check that the carbon loading and dispersion are specified, not just the colour.
6. Where buyers get it wrong
The usual mistake is comparing the price of a kilogram of masterbatch against a kilogram of compound. Those are not the same product: one is a concentrate you dilute, the other is finished material. Convert both to cost to produce 1,000 kg of my part, including the natural resin, the dosing step and the scrap rate, and the answer usually becomes obvious.
The second mistake is treating "black" as one specification. For outdoor pipe, agricultural film or an automotive interior, the carbon loading, the carbon type and the carrier are all part of the specification — and they are what separate a part that lasts from one that comes back.
7. Storage, shelf life and lot traceability by format
This is the part of the comparison that rarely makes it into the cost spreadsheet, and it is where liquid colour most often surprises a buyer who switched to it for the price.
| Format | Storage | Shelf life | Lot traceability |
|---|---|---|---|
| Black masterbatch (pellets) | Dry, sealed, ambient. 25 kg bags or big bags on pallets — ordinary warehouse space. | Effectively unlimited when kept dry; a solid pellet has no separation mechanism to fail. | Batch number on the bag, batch CoA on file. A bag traces back to a compounding run. |
| Pre-compounded black resin | Same as any resin — dry, sealed, ambient. | Long, with the usual polymer-specific drying requirement at the machine. | Traceable at the compound batch level, but the black and the polymer are now one article. |
| Liquid colour | Sealed drums, temperature-controlled, often with a stated storage range. Settlement is normal and requires agitation before use. | Finite, and shorter than either solid format. Expiry matters. | Traceable by drum, but dispersion state depends on how it was stored and stirred before your line saw it. |
Two practical consequences. First, a liquid system adds a storage and agitation discipline to your plant that the pellet formats do not — that is real labour, even when it never appears on the invoice. Second, where a customer or an auditor asks you to trace a finished part back to the material that made it, all three formats can answer, but the solid formats answer with less paperwork: the bag carries the batch number and the CoA is on file.
8. What each format does to your incoming inspection
The receiving inspection you already run will treat these three formats very differently. If you compare them on price alone, you are comparing them without this cost.
- Black masterbatch. A 30-minute incoming protocol is genuinely practical — carbon content, MFI, moisture, ash, plus a filter-pressure check on the lot. You are inspecting a solid, stable article with a batch CoA written against it. The protocol is here.
- Pre-compounded resin. You inspect the finished compound rather than a concentrate. Most of what you would have checked on the masterbatch has already been decided by the compounder — convenient, and also meaning you have less to check and less to specify.
- Liquid colour. Inspection starts before the drum is opened: stored within range, agitated as specified, and in date. Solids content and viscosity are the routine checks, and both can move with storage history in a way a pellet's figures simply do not.
The pattern is the same one that runs through the whole comparison: the more work a format moves upstream to the supplier, the less control — and the less inspection burden — you keep at your own plant. Neither is automatically better. What is a mistake is pricing the three formats as though the only difference were the invoice, when the difference is also how much of the quality job stays with you.
Questions buyers ask when choosing a colour route
These three routes are genuinely different products, and the comparison buyers usually make is the wrong one.
Is a liquid colour cheaper than a masterbatch?
Per kilogram of colour, often yes, and that is exactly why the comparison is misleading. Liquid colour is delivered in a carrier that is not part of your product, so some of what you buy ends up diluting your melt rather than colouring it. Masterbatch carries the pigment in a resin you chose, at a loading you chose. Compare the cost to achieve a target colour in the finished part, including the carrier resin a liquid route forces into the formulation, and the answer frequently reverses on higher-volume parts.
When does a liquid colour make more sense than a masterbatch?
Where the carrier does not have to be the product resin. Very high loading requirements, where a masterbatch would need an impractical let-down, are one case. Processing aids or stabiliser concentrates that you would not want to carry in the product resin are another. Where your part is a thin film or a short run, the handling advantage of a liquid can outweigh the economics. For most extrusion applications in a chosen carrier resin, the masterbatch route is simpler and usually cheaper once the arithmetic is done properly.
What is a pigment concentrate and where does it fit?
A concentrate is pigment plus enough carrier to make it handleable, but without the reinforcement or property modification that a compound carries. It sits between a raw pigment and a masterbatch. It is useful when you need pigment at a loading above what a masterbatch can hold, or when you need a specific pigment that no masterbatch supplier will put into a standard grade. It also means more variables in your own process, because you are now dosing two materials rather than one.
How do I compare a compound against a masterbatch for cost?
By the finished tonne, using the grade's own let-down ratio and your part weight. A compound arrives ready to use, so its quoted price is the price; a masterbatch price must be scaled by the ratio to get to the same basis. Add the handling: a compound needs no dosing equipment and no re-melting discipline, while a masterbatch needs accurate gravimetric feeding. On low volume the handling can dominate, and on high volume the material cost almost always dominates.
Continue reading
- What is black masterbatch? — the definition and the three components, for readers new to the category.
- Carbon black price outlook 2026 — how carbon black feedstock moves the masterbatch vs. compound price gap.
- How to calculate let-down ratio for black masterbatch — the math behind "cost per finished part" comparisons.
Related pages
- Injection moulding grades — where compound and masterbatch compete most directly
- All black masterbatch grades — carriers, carbon loading and let-down guidance
- Pricing and quotation — what drives cost per kg and how to get a firm quote