Food-Grade Masterbatch & Colourants for Food Packaging

A food-grade masterbatch is a concentrated carrier-resin pellet that you let down into your base polymer to colour or functionalise food packaging — and specifying it correctly comes down to three things: the carrier resin must match your base polymer, the let-down ratio (LDR) must hit the target shade or function without overloading the melt, and the colourants and additives must meet the relevant food-contact rules. The single most common mistake is treating masterbatch as a cosmetic afterthought: the pigments, carrier and additives are all part of the food-contact article, and they fall under the same migration regime as the resin itself.

The short version for buyers: confirm the carrier matches your polymer (PE carrier for PE, PP carrier for PP), fix the LDR to the supplier’s recommendation (typically 1–5% for colour), and require documentation that the colourants meet EU Regulation 10/2011 and/or US FDA 21 CFR, with purity to Council of Europe Resolution AP(89)1. Below, each in turn.

What masterbatch is and why the carrier matters

Masterbatch is pigment or functional additive pre-dispersed at high concentration in a polymer carrier, supplied as pellets. You meter it into your virgin resin at the moulding or extrusion machine so the colour or function ends up evenly distributed in the finished part. The alternative — dosing raw pigment powder — gives poor dispersion, dust and contamination risk, which is why masterbatch dominates food packaging.

Carrier resin compatibility is non-negotiable

The carrier is a real polymer and it ends up in your part. If the carrier is incompatible with your base resin you get poor dispersion, streaking, weak welds or haze. The rule is simple: match the carrier chemistry to the base polymer.

• PE-carrier masterbatch for polyethylene (HDPE, LDPE, LLDPE) parts, processed around 160–220 °C.
• PP-carrier masterbatch for polypropylene parts, processed around 200–250 °C.
• For PET, use a PET-compatible or “universal” carrier verified for PET — never assume a polyolefin carrier will behave in a PET preform.

A “universal” carrier can bridge several polymers but should still be confirmed for your specific resin and process. Carrier compatibility and processing-temperature data come from masterbatch technical literature (RongFeng — food-grade white masterbatch & FDA and Plastics Technology — masterbatch overview).

Why a carrier mismatch is not just cosmetic

It is tempting to treat the carrier as inert filler — it is a few percent of the part, after all. Two reasons it is not:

• Process and quality. An incompatible carrier disperses poorly. In a thin-wall PP tub a PE-carrier masterbatch can leave fish-eyes and streaks; in a PET preform a polyolefin carrier can create haze and weak points that show up only after blowing. The defect cost lands downstream, where it is most expensive.
• Compliance. The carrier ends up in the food-contact layer, so the carrier polymer itself has to be a food-contact grade and declared. A “food-grade pigment” on a non-compliant carrier does not give you a compliant masterbatch. Ask for the carrier’s status, not just the pigment’s.

Solid vs liquid colour

Most food packaging uses solid pellet masterbatch, dosed gravimetrically at the throat. Liquid colour systems exist (common for some PET and beverage-cap applications) and can offer tight dosing at very low addition rates, but they need a dedicated pump and their own food-contact documentation. Whichever form, the compliance logic below is identical — the pigment, carrier and additives are all part of the article.

Let-down ratio (LDR): getting dosage right

The let-down ratio is the percentage of masterbatch you add to the base resin. It is set by the depth of colour you want, the opacity of the base polymer and the pigment loading in the masterbatch. Typical bands (Tedé Solutions — masterbatch dosing & LDR):

Two things the LDR does not let you off the hook for:

• Homogeneity. Correct LDR with poor screw mixing still gives streaks. Dosing accuracy and melt homogeneity are part of the spec, not just the percentage on paper.
• Migration headroom. A higher LDR puts more pigment and additive into the food-contact article. That has to stay inside the migration limits below, so “just add more” is not a free move.

Functional masterbatches for food packaging

Beyond colour, food packaging uses functional masterbatches:

• AA (acetaldehyde) scavengers for PET. Acetaldehyde is a natural by-product of PET processing; it has a faintly sweet taste and causes an “off” note in bottled water at very low levels. AA-scavenger masterbatches catch the AA in the bottle wall and cut its migration into the water — commercial systems claim reductions of up to ~80% in the bottle wall, and they are what allows higher recycled-PET content without taste penalties (Ampacet AA Scavenger; Avient ColorMatrix Triple A). For water preforms this is a near-standard additive, not an optional extra.
• UV stabilisers to protect light-sensitive contents.
• Slip and anti-block for film.
• White (TiO₂) for opacity in dairy and UHT bottles, where light protection matters.

Every one of these adds substances to the food-contact layer and so has to be declared and assessed for compliance.

Pigment chemistry: inorganic vs organic

The colour itself comes from one of two pigment families, and the distinction matters for both shade and compliance:

• Inorganic pigments — titanium dioxide (white), iron oxides (yellow/red/brown/black), ultramarine (blue). Generally high opacity, excellent heat and light stability, and a well-characterised purity profile. TiO₂ is the workhorse for opaque dairy and UHT packaging where light protection extends shelf life.
• Organic pigments — phthalocyanines (blues/greens), azo and high-performance reds and yellows. Cleaner, brighter, more transparent shades, but heat stability and migration behaviour vary widely by pigment, so the data sheet and purity declaration matter more.
• Carbon black — used for opacity and for black parts; it is specifically referenced in the EU Plastics Regulation with its own specifications, and its purity (PAHs, extractables) must be demonstrated.

For a food pack, the right pigment is the one that gives the shade at an acceptable LDR, survives the process temperature, and has a clean food-contact purity declaration. A brilliant shade that needs a heavy dose of a borderline pigment is the wrong choice.

Compliance: colourants are part of the food-contact article

This is where food-grade masterbatch differs from industrial masterbatch. The colourant, the carrier and the additives are all in contact with — or close to — the food, so they fall under food-contact law. Keep the distinction clean: food-grade describes the material’s intended grade; food-safe describes whether the finished article actually meets migration limits in its real use. A food-grade masterbatch used wrongly does not give you a food-safe pack. (We cover this in Food-grade vs food-safe resins.)

EU Regulation (EU) No 10/2011

The EU Plastics Regulation governs plastic food-contact materials. Two limits frame everything:

• Overall migration limit (OML): the total of all substances migrating into food must not exceed 10 mg/dm² of contact surface (equivalently 60 mg/kg under the standard assumption), tested per EN 1186 (getEnviropass — EU 10/2011; EUR-Lex Regulation 10/2011).
• Specific migration limits (SMLs): individual substances on Annex I carry their own mg/kg limits; for substances with no specific limit, a generic SML of 60 mg/kg applies.

Colourants sit in a particular position. Under Article 6.2 of the Regulation, colourants are not subject to the positive-list (authorisation) requirement that applies to most plastic substances — they are governed by national law instead. But the migration limits still bite indirectly: pigments can carry heavy-metal and primary-aromatic-amine (PAA) impurities, and Annex II of the Regulation sets limits on those — lead, cadmium, mercury, nickel and other elements, plus PAAs (Keller & Heckman — colourants in the EU; PackagingLaw.com). Carbon black, when used, is itself listed in the Regulation with specifications to meet. For titanium dioxide used as a plastics additive, no migration is anticipated under normal use — but that is a statement about the substance, not a waiver of the OML for the whole article.

Council of Europe Resolution AP(89)1

The practical purity benchmark for colourants is Council of Europe Resolution AP(89)1 (adopted 13 September 1989). It is not legally binding, but it is the document customers and labs use to demonstrate colourant safety across Europe. It sets purity criteria and caps on extractable metals and toxic impurities in pigments and carbon black — antimony, arsenic, barium, cadmium, chromium, lead, mercury, selenium, PAAs and PCBs (Keller & Heckman — colourants in the EU). A credible masterbatch supplier will state AP(89)1 conformity for the colourant.

US FDA 21 CFR

For the US framework, colourants and carriers must comply with the relevant US FDA 21 CFR sections. Titanium dioxide as a colour additive in food-contact plastics is addressed at 21 CFR §73.575, which permits its use provided it does not exceed 1% by weight of the finished polymer (RongFeng — FDA & food-grade white masterbatch). Carrier resins must themselves be cleared for the intended food-contact condition.

Compliance summary

State capability as compliant with / meets the requirements of, certificates and migration data available on request — never “FDA-approved” or “EU-certified,” which the system does not issue for a colourant. Make no health claims. Verify the actual finished pack by migration testing for the real food, temperature and contact time; the masterbatch’s grade is necessary but not sufficient on its own.

The documents to ask for — and what each proves

A masterbatch arriving without paperwork is unsourced as far as a food-contact pack is concerned. Request, at minimum:

The DoC and purity statement are supplier representations; the migration test report is independent evidence on the finished pack and is the document that actually demonstrates food-safety in use. For high-risk combinations (fatty foods, hot-fill, long shelf life) the migration test is not optional. We treat the DoC as the entry ticket and the migration report as the proof.

Common food-packaging colour jobs

The same compliance logic applies across packaging types, but the practical brief differs:

• Dairy and UHT bottles (HDPE/PP). Opacity is the functional requirement, not just colour — light degrades fats and light-sensitive vitamins, so a high-TiO₂ white (often with a light-blocking layer or co-extruded black/white structure) is specified. Here white masterbatch is doing a protection job, and the LDR is driven by required opacity, typically toward the higher end of the 1–3% band.
• Water and CSD preforms (PET). Usually clear or a light tint; the dominant masterbatch is the AA scavenger, not colour. Light blue tints are common for branding and to flatter clarity, dosed at very low LDR.
• Caps and closures (HDPE/PP). Strong, consistent brand colours at high line speeds; colour consistency lot-to-lot is the buyer’s main pain point, so a Pantone reference and a per-lot Certificate of Analysis matter.
• Tubs, trays and thin-wall (PP). Colour plus sometimes nucleating or anti-static additives; thin walls show dispersion defects readily, so carrier match and homogeneity are critical.
• Films (LDPE/LLDPE/PP). Colour with slip and anti-block; very thin gauges magnify any pigment agglomerate into a visible gel.

In every case, write the brief as polymer + shade/function + food-contact conditions, and the compliance documentation list follows automatically.

Troubleshooting: when colour goes wrong

Most masterbatch problems trace back to one of four causes, and naming them up front prevents finger-pointing between the resin, the masterbatch and the moulder:

• Streaking / poor dispersion → usually carrier mismatch or insufficient melt mixing. Check carrier-to-polymer match first, then screw profile and residence time.
• Shade drift lot-to-lot → dosing accuracy (gravimetric vs volumetric feeder), pigment-loading variation in the masterbatch, or process-temperature swings. A per-lot CoA and a tight LDR control catch this.
• Off-taste in the pack (PET water especially) → acetaldehyde; address with an AA scavenger and verify with a taste/headspace check, not just colour.
• Migration failure on test → too high an LDR pushing pigment/additive over the OML or an SML, or a borderline pigment. Reduce dose, reformulate the pigment, or re-engineer the structure; do not ship on the strength of the DoC alone.

The discipline is the same as for any food-contact material: specify it, document it, and verify the finished article — grade alone never proves the pack.

How Innovote sources this

Buyers usually arrive with a target colour or a function (“we need an AA scavenger for water preforms,” “white for UHT milk bottles”). We turn that into a buildable, compliant spec before we quote. Our intake:

1. Base polymer and process. PE, PP or PET; injection, ISBM or extrusion; melt temperature — so the carrier matches and the masterbatch survives the process.
2. Target shade or function. A Pantone/colour standard or a physical sample for colour; the required performance (e.g. AA reduction, opacity, UV) for functional grades. This sets the LDR.
3. Food-contact conditions. Food type, fill temperature, contact time, shelf life — the inputs to migration assessment.
4. Documentation required. Declaration of Compliance to EU 10/2011, colourant purity to AP(89)1, FDA 21 CFR statements where the US market matters, plus migration test data for the finished article on request.
5. Volumes, MOQ and landed cost. Pellet vs liquid, packaging, and the landed-cost path into Egypt.

We cross-check the carrier against the resin we are already supplying, confirm the LDR with the supplier’s technical data sheet, and keep the colourant and additive declarations on file with the resin certificates. For the migration side, see Migration testing and food-contact compliance; for choosing the base resin the masterbatch goes into, see PP vs HDPE vs LDPE for food contact. Tell us the polymer, the shade or function and the food-contact conditions, and we come back with carrier, LDR, compliance documentation, MOQ and a landed-cost path.

FAQ

What carrier should a food-grade masterbatch use?
The carrier must match your base polymer: a PE carrier for polyethylene parts, a PP carrier for polypropylene, and a PET-compatible or verified universal carrier for PET. A mismatched carrier causes poor dispersion, streaking and weak welds, and the carrier itself must be cleared for food contact.

What is a typical let-down ratio for colour masterbatch?
Around 1–5% for colour, 1–3% for white (TiO₂) driven by opacity, and 3–10% or higher for functional masterbatches such as UV or AA scavengers. The exact figure depends on shade depth, base-polymer opacity and pigment loading; follow the supplier’s data sheet and confirm melt homogeneity.

Is “food-grade masterbatch” the same as “food-safe”?
No. Food-grade describes the intended grade of the material; food-safe describes whether the finished article actually stays within migration limits in its real use. A food-grade masterbatch used outside its intended conditions can still produce a non-compliant pack — verify by migration testing.

Which regulations apply to colourants in food packaging?
In the EU, Regulation (EU) No 10/2011 sets the overall migration limit of 10 mg/dm² and Annex II limits on heavy metals and primary aromatic amines from pigments; colourants are exempt from the positive list under Article 6.2 but follow national law and Council of Europe Resolution AP(89)1 for purity. In the US, US FDA 21 CFR applies, with TiO₂ at §73.575 capped at 1% of the finished polymer.

Do PET water preforms need an additive masterbatch?
Usually an AA (acetaldehyde) scavenger, yes. Acetaldehyde forms during PET processing and gives bottled water an off-taste at very low levels; scavenger masterbatches cut its migration into the water by up to around 80% and allow higher recycled-PET content without taste penalties.

Can you claim a masterbatch is FDA-approved?
No. The FDA does not “approve” individual colourants or masterbatches in that way. The correct phrasing is that the material is compliant with, or meets the requirements of, the relevant 21 CFR sections, with documentation and migration data available on request.

Need a food-grade colour or functional masterbatch specified and sourced? Tell us the base polymer, the shade or function and your food-contact conditions — we’ll come back with carrier, LDR, compliance documentation, MOQ and a landed-cost path into Egypt.

Related: Food-Grade Packaging Resins (hub) · Migration testing and food-contact compliance · PP vs HDPE vs LDPE for food contact

By the Innovote Trade Desk.