This page answers the most basic masterbatch questions: what it is, how it is built, why the carrier decides everything, how it differs from pigment powder and color paste, and how to judge quality. Read these 30 answers and you will know what to look for in a supplier's TDS.
A masterbatch is a concentrated coloring pellet made by pre-dispersing high-load pigments, a carrier resin and dispersing agents on a twin-screw extruder. In use it is blended into natural resin at a set ratio, completing the coloring in one step: more uniform than raw pigment powder, dust-free, and with controllable color. It is the mainstream way to color plastic products today.
A masterbatch has three components: pigment or dye (provides the color, typically 10%-50%), carrier resin (a resin compatible with the plastic being colored, 30%-70%), and dispersing agents plus processing aids (to disperse the pigment evenly and prevent agglomeration). Functional masterbatches additionally carry functional additives such as flame retardants, UV stabilizers or calcium carbonate.
The carrier is the base resin that holds the pigment and carries it into the host resin. In principle it must be the same as, or compatible with, the plastic being colored: PE carrier for PE, PP carrier for PP, ABS carrier for ABS. A mismatched carrier causes poor dispersion, color deviation and strength loss — this is the first rule of masterbatch selection.
Pigment powder is pure pigment: cheap, but the customer must premix and disperse it; it is dusty, color deviation is hard to control, and process demands are high. A masterbatch has the pigment pre-dispersed in a carrier — clean to use, reproducible color, fast color changes. Except for very large color volumes or special matches, most injection molding and film blowing plants use masterbatch directly.
A color paste is pigment dispersed in a liquid medium, used mainly in coatings, inks and plasticized soft-PVC systems. A masterbatch is a solid pellet used for injection molding, extrusion and film blowing of thermoplastics such as PE, PP and ABS. The two systems are different and cannot simply be swapped.
By color: black, white and colored masterbatch. By carrier: dedicated grades for PE, PP, PVC, ABS, PA, PC and more. By function: coloring masterbatch and functional masterbatch (flame retardant, UV resistant, filling, antistatic, antibacterial, etc.). By scope: universal and dedicated. When purchasing, first fix the carrier, then the color, then the function.
Universal masterbatch uses a broadly compatible carrier (e.g. EVA or a composite carrier), so one grade can serve several resins — convenient for stock, but dispersion and color strength are compromises. Dedicated masterbatch matches the host resin exactly, giving optimal concentration and dispersion at lower letdown. Use dedicated masterbatch for main products; keep universal masterbatch for multi-SKU small-batch emergencies.
Typical black masterbatch contains 20%-50% carbon black, white masterbatch 30%-70% titanium dioxide, colored masterbatch 10%-40% pigment. Higher content means lower letdown, but too high hurts dispersion and cost. Select on two criteria: matching the hiding power of the target color, and matching your own process's dispersion capability.
Masterbatch costs more per kilo than equivalent pigment powder, but total cost is usually lower: low letdown (typically 1%-4%), no dust loss, no premixing labor, fewer color-deviation reworks, shorter color-change purge times. On volume orders that demand stable quality, the yield advantage easily covers the price difference.
Masterbatch fits almost every thermoplastic process: injection molding, film blowing, cast film, pipe and sheet extrusion, blow molding, monofilament and strapping, rotomolding, foaming and more. The catch is that carrier and pigment heat stability must match processing temperature — high-temperature resins such as PA and PC need masterbatch rated above 280°C.
Masterbatch (also called master concentrate) refers to concentrated pellets in which pigments or additives are pre-dispersed at high loading in a carrier resin. In English usage, color masterbatch means a coloring concentrate; additive or filler masterbatch means functional and filling concentrates.
Masterbatch solves 'introducing color and additives' at a letdown of only a few percent; modified plastics (e.g. glass-fiber reinforced PA66, flame-retardant PPS) are used directly as the raw material for structural parts. The two are often combined: choose the right modified grade first, then color it with a matching masterbatch — our two business lines cover exactly this chain.
PE products use PE-carrier masterbatch (common in film blowing, blow molding and rotomolding); PP products use PP-carrier masterbatch (common in injection-molded housewares and crates); ABS products use ABS-carrier masterbatch (common in appliance housings and toys). Always run a trial before cross-carrier use to verify dispersion and color fastness.
White masterbatch uses titanium dioxide (mainly rutile) as pigment; key indicators are TiO2 content, hiding power and whiteness. Black masterbatch uses carbon black; key indicators are carbon black concentration, jetness and blue tone. These are the two largest-volume categories, with regular stock normally available.
A functional masterbatch is a pellet in which functional additives (flame retardants, UV stabilizers, antioxidants, calcium carbonate, antistatic agents, antibacterial agents, etc.) are pre-dispersed at high concentration in a carrier. Used the same way as color masterbatch, it introduces a specific function into plastic at a set ratio, with more uniform dispersion and more accurate dosing than adding powder directly.
High-concentration masterbatch runs at low letdown (0.5%-2%): less total usage for the same coloring effect, less impact on base resin properties, lower freight and storage cost — ideal for large stable orders. But it demands more from dispersion, so proper mixing and screw shear matter; for small batches or simple equipment, medium and low concentration grades are easier.
Check five things: pigment dispersion uniformity (cut a pellet and inspect the cross-section for color specks and agglomerates), whether concentration and hiding power match the standard, whether the carrier matches your resin, whether there are contaminants or black specks, and whether batch-to-batch color difference is stable (the ΔE control range). Ask the supplier for COA plus heat-stability and migration data.
Masterbatch is chemically stable; unopened and stored dry it performs best within about 2 years. Moisture, sunlight and damaged packaging hurt performance. If pellets have absorbed moisture, dry at about 80°C for 2 hours before running. For expired stock, trial color and dispersion first before deciding whether to use it.
Keep it in the original sealed packaging in a cool, dry warehouse, away from sunlight, rain and volatile chemicals; reseal opened bags and use them up promptly. Storage temperature should stay below 40°C and away from heat sources. In humid rainy seasons watch for moisture — store pallets off the floor if necessary.
Main sources: carbon black or pigment agglomeration from poor dispersion, carrier degradation, carbonized build-up in equipment, and recycled-material contamination. Fix by upgrading the masterbatch dispersion grade, shortening residence time and lowering processing temperature, purging screws and dies regularly, and controlling regrind cleanliness at the source.
Common methods: press a pellet into a chip and examine pigment particle size and distribution under a microscope; blow thin film and count color specks per square meter; mold standard color plaques and compare gloss and ΔE. For purchasing, run the same recipe on your own equipment — the dispersion gap is immediately visible.
Regular checks: RoHS (six heavy metals), REACH (SVHC list), halogens, phthalates. Food contact: pigment lists under FDA 21 CFR or EU 10/2011. Toys: EN71-3. Ask the supplier for the corresponding test reports; we routinely supply RoHS/REACH compliant masterbatch, with food-contact grades available on request.
Food-grade masterbatch uses pigments, carriers and additives that all comply with food-contact regulations (e.g. FDA 21 CFR, EU 10/2011, GB 9685); it is used for food packaging, tableware, cups and similar items. The key is that the pigment list is compliant and overall migration limits are met — confirm the application and regulation version in writing when ordering.
Yes, coloring regrind with masterbatch is common. Note three things: regrind has a yellow or gray base color, so correct for it when matching; its carrier may differ from the original resin, so test compatibility first; contamination is higher, so use a filter screen and slightly raise the masterbatch concentration to compensate for the base color.
Yes. Provide a Pantone number or a physical sample; the colorist builds target Lab values with a spectrophotometer, selects a heat- and weather-stable pigment combination, makes trial plaques, then verifies on the machine. Standard matching takes 2-5 working days; complex metallic and pearlescent colors may need one extra fine-tuning round.
Halogen-free masterbatch contains no halogen flame-retardant system and no halogen-bearing pigments; it is often paired with halogen-free flame-retardant resins in electronics and electrical products. Halogen (Cl+Br) content must be below the customer's limit (commonly 900ppm/1500ppm); ask for a third-party halogen test report when purchasing.
Paint-free resin has the effect pigment built into the modified compound: strong high-gloss metallic look with no flow marks, but higher price and fewer color options. Masterbatch is flexible, cheaper and quick to change color; for metallic effects the key is carrier and process matching. High-budget appearance parts favor paint-free; flexible multi-color production favors masterbatch.
Not necessarily. Expensive masterbatch usually means better pigment grade, higher concentration and better dispersion — but if your product is just a standard structural part, a cost-effective regular grade is enough. Select by use: outdoor parts prioritize weatherability, food parts compliance, appearance parts dispersion and ΔE. Spend on the metrics that matter.
Masterbatch is normally cut into cylindrical pellets about 2-5mm long and 2-3mm in diameter, similar to general resin pellets for easy blending. Irregular pellet shape or excessive fines causes dosing fluctuation — checking pellet uniformity on receipt is a quick first quality check.
No truly universal masterbatch exists. So-called universal grades use a wide-compatibility composite carrier covering PE/PP/PS/ABS, but dispersion and compatibility drop clearly on engineering plastics such as PA, PC and POM, with risk of strength loss and delamination. Engineering plastics must use the corresponding dedicated masterbatch.
Send the part, the service conditions and your monthly volume — we will propose an equivalent grade, a sample and a quote.