Analytical Screening Protocol Gaps for Non Intentionally Added Substances in Proprietary Pigment Concentrate Chains

Origin

Chemical complexity in proprietary color concentrates stems from multi-step organic synthesis pathways. Masterbatch manufacturers compound synthetic organic pigments, inorganic oxides, dispersing aids, carrier resins, and process stabilizers into concentrates for downstream polymer injection or extrusion. While raw colorants undergo standard purity evaluations, industrial synthesis of organic pigments inherently leaves behind unreacted starting materials, structural isomers, side-reaction byproducts, and trace catalyst residues.

These non-intentionally added substances sit embedded within the masterbatch matrix, largely unmapped by standard technical data sheets.

During pigment synthesis, coupling reactions for azo structures or ring-closure steps for quinacridones rarely proceed to absolute stoichiometric completion. Unreacted aromatic amines, chlorinated benzene derivatives, and structural isomers remain at concentrations ranging from tens to thousands of parts per million in raw pigment powders. Blending these powders with carrier resins under high thermal profiles causes low-molecular-weight species to migrate into the polymer phase, creating complex chemical mixtures that complicate downstream compliance validation.

Pigment Synthesis Residues and Degradation Byproducts

Industrial production of organic colorants inevitably yields side-products from unreacted starting materials and secondary pathways. In diarylide yellow pigments (such as Pigment Yellow 12 or Pigment Yellow 13), trace amounts of 3,3′-dichlorobenzidine persist if coupling parameters deviate from ideal stoichiometry. Phthalocyanine blue and green synthesis routes rely on copper salts and halogenated phthalic anhydrides, leaving trace free copper, chlorinated solvents, and semi-volatile halogenated aromatic intermediates in the crude pigment cake.

Thermal exposure during processing scales this risk significantly.

When these raw pigments undergo micronization and surface treatment, surfactants and coupling agents are applied to improve dispersibility. These surface-active agents ~ often alkylphenol ethoxylates, fatty acid amides, or organosilanes ~ break down thermally during compounding. The resulting break-down products include low-molecular-weight alkylphenols, free fatty acids, and short-chain siloxanes.

Because analytical screening focuses primarily on the main pigment structure, these residual additives and thermal breakdown products pass through undetected right at the raw material entry point.

Carrier Wax and Processing Aid Interactions

Low molecular weight polyolefins added during compounding assist pigment dispersion across the polymer matrix. Synthetic polyethylene waxes, polypropylene waxes, and zinc or calcium stearates lower melt viscosity and prevent pigment agglomeration. However, oxidized polyethylene waxes carry low-level aldehydes, ketones, and carboxylic acids generated during intentional oxidation steps, while zinc stearate contains variable ratios of palmitate and oleate impurities alongside unreacted free stearic acid.

High levels of matrix interference frequently mask these low-concentration species.

During compounding, these waxes and processing aids interact under shear and heat with the primary polymer carrier, such as linear low-density polyethylene or polypropylene random copolymer. The resulting thermomechanical degradation generates cyclic oligomers, branched alkanes, and unsaturated esters. With their high diffusion coefficients within polyolefins, these light fractions readily migrate into packaged foods or pharmaceuticals.

Conventional testing frameworks that evaluate only the base resin ignore the additive load introduced by the masterbatch carrier system.

Upstream declaration gaps consistently shift financial liability down the converter chain. When proprietary masterbatch formulas are treated as trade secrets, converters cannot identify specific marker compounds for quantitative migration assays. Without explicit chemical formulas from the concentrate manufacturer, testing laboratories must run broad non-targeted screenings, which suffer from variable sensitivity and compound-dependent extraction yields.

Unresolved chromatographic peaks represent unquantified risk for downstream processors.

Non-targeted screening protocols rely on universal detection parameters that frequently miss polar or highly volatile degradation products. Consequently, a concentrate declared compliant based solely on raw pigment specifications can introduce dozens of unmapped migrant compounds into the final molded or extruded article. Masterbatches formulated with recycled carrier resins or low-grade waxes expand this chemical baseline, introducing post-consumer residues and industrial contaminants into food-contact structures.

Pigment masterbatch compliance relies on proving the absence of unmapped thermal degradation products rather than verifying raw colorant purity certificates.

A masterbatch formulation containing uncharacterized dispersing waxes or low-purity organic pigments will consistently generate migrant species that escape standard target-compound screening lists. Masterbatch compounders who rely entirely on pigment supplier data sheets without performing post-compounding thermal degradation studies leave downstream customers exposed to regulatory non-compliance. Comprehensive screening protocols account for both the raw input chemistry and the thermomechanical history of the processed concentrate block.

Bench

Evaluating unknown chemical species in polyolefin masterbatches demands sophisticated instrumental configurations. Analytical laboratories deploy gas chromatography coupled to mass spectrometry for volatile and semi-volatile species, liquid chromatography with high-resolution mass spectrometry for non-volatile compounds, and inductively coupled plasma mass spectrometry for elemental analysis. Despite high sensitivity, these techniques run into severe physical constraints when analyzing complex color concentrate matrices.

Sample preparation remains the primary barrier in masterbatch testing. Pigments are insolubilized by design, requiring aggressive solvent extractions or dissolution-precipitation techniques to liberate low-molecular-weight compounds embedded within the polymer carrier. Total dissolution of polyolefin carriers requires elevated temperatures and aggressive solvents like xylene, dichlorobenzene, or tetrahydrofuran.

These extraction media extract structural waxes, oligomers, and high-concentration additives alongside target migrants, overwhelming chromatographic columns and masking low-level non-intentionally added substances.

Solvent Extraction Bias in Polymer Matrices

Sample preparation determines which chemical compounds reach the liquid phase for chromatographic separation. Solvent choice dictates extraction efficiency based on polarity, swelling capacity, and molecular weight cut-off. Hexane or dichloromethane extractions target lipophilic species, such as aliphatic hydrocarbons and ester waxes, while ethanol or acetonitrile extractions isolate polar degradation products.

No single solvent system achieves quantitative extraction of all potential migrants without precipitating carrier polymer chains that clog analytical instrumentation.

Standard screening protocols routinely leave significant analytical blind spots.

When performing migration testing into food simulants according to European Standard EN 1186, laboratories expose finished articles to 10% ethanol (Simulant A), 3% acetic acid (Simulant B), or vegetable oil / Tenax (Simulants D2 and E). However, masterbatch screening is frequently conducted on raw masterbatch pellets using exhaustive solvent extractions rather than measuring migration kinetics. Exhaustive extraction overestimates potential migration for high-molecular-weight compounds while undercounting highly volatile species lost during solvent evaporation, leaving a wide gap between laboratory screening data and actual migration profiles.

Ionization Suppression and Chromatographic Blind Spots

Electrospray interfaces in liquid chromatography exhibit varying sensitivity based on analyte polarity. High concentrations of slip agents (such as erucamide or oleamide) or dispersing waxes co-eluting with non-intentionally added substances suppress ionization in electrospray ionization (ESI) sources. This matrix suppression effect flattens detector signal response for co-eluting trace unknowns, allowing toxicologically significant compounds to pass below the analytical limit of detection.

Tracking analytical screening limits across multiple simulant media helps establish baseline detection thresholds. In gas chromatography-mass spectrometry (GC-MS), highly volatile organic compounds (boiling point below 50 °C) escape during solvent condensation procedures, while high-molecular-weight species (molecular weight above 800 Daltons) fail to vaporize in standard injection ports, rendering both fractions invisible to standard GC-MS screening.

The list below identifies analytical screening failure mechanisms occurring during masterbatch matrix evaluation:

• Co-Elution Suppression occurs when high concentrations of dispersing waxes enter the mass spectrometer ion source simultaneously with trace migrants, suppressing signal ionization by up to 90%.
• Thermal Pyrolysis Artifacts arise in gas chromatography injectors set above 280 °C, where organic pigments decompose in the inlet and produce false-positive aromatic amine signals.
• Spectral Library Deficiencies limit compound identification, as commercial libraries like NIST or Wiley lack entries for complex cyclic oligomers, branched ester additives, and pigment synthesis impurities.
• Response Factor Discrepancies distort semi-quantitative calculations when using surrogate standards (such as toluene or d5-benzoic acid) for non-targeted mass spectrometry peaks, creating quantification errors exceeding 300%.

To quantify unknowns without authentic reference standards, analytical chemists apply response factors derived from internal standards. However, ionization efficiency in mass spectrometry varies by up to two orders of magnitude between different chemical structures. Assigning a universal response factor based on d5-benzoic acid or toluene overestimates concentrations of easily ionized species while drastically underestimating poorly ionizing compounds like cyclic polyolefin oligomers or halogenated aromatic residues.

Applying the Threshold of Toxicological Concern (TTC) concept under European Food Safety Authority (EFSA) guidelines assigns a default screening threshold of 0.01 mg/kg (10 ppb) in food for uncharacterized non-intentionally added substances without genotoxicity data. Achieving a 10 ppb limit of detection in a concentrated masterbatch requires extensive sample cleanup to eliminate carrier waxes and primary additives. Standard commercial testing packages offering screening at 0.1 mg/kg or 1.0 mg/kg limits leave a major regulatory gap, failing to detect genotoxic compounds present between 0.01 mg/kg and 0.1 mg/kg.

High-resolution mass spectrometry (HRMS) using quadrupole time-of-flight (QTOF) mass analyzers improves elemental formula assignment for unknown chromatographic peaks. However, elemental formula identification does not establish exact structural isomerism. A calculated formula of C15H24O can represent 2,4-di-tert-butylphenol, 2,6-di-tert-butylphenol, or several inert branched alkenyl phenols, each possessing distinct toxicological profiles and specific migration limits under REACH and food contact regulations.

Analytical screening that quantifies unknown peaks against a single internal standard carries an inherent margin of error exceeding three hundred percent.

Determining whether an unknown mass spectrometry peak represents a genotoxic aromatic amine or a benign fatty acid fragment requires multi-stage MS/MS fragmentation matching, complementary NMR spectroscopy, or synthesis of authentic reference standards. Commercial analytical workflows operating under standard fee schedules rarely perform structural confirmation down to the 0.01 mg/kg threshold, leaving masterbatch users dependent on unverified semi-quantitative screening reports.

How can analytical laboratories resolve co-eluting hydrocarbon interference without destroying thermal degradation products essential for toxicological evaluation?

Paperwork

Regulatory compliance declarations form the legal backbone of food-contact material trade. Under Commission Regulation (EU) No 10/2011, plastic materials and articles intended to come into contact with food must be accompanied by a written Declaration of Conformity (DoC) at all marketing stages up to retail sale. This requirement applies directly to masterbatch manufacturers, who must supply downstream converters with compliance documentation detailing additive limitations, dual-use additive content, and specific migration limits.

However, a profound structural gap exists between masterbatch declarations and finished article compliance requirements. Masterbatch compounders frequently issue standardized declarations asserting compliance with Annex I positive lists based solely on input raw materials. These documents regularly omit non-intentionally added substances generated during compounding, citing proprietary trade secret protections or lack of analytical data from pigment suppliers.

Can Proprietary Additive Formulas Hide Toxicological Risk?

Chemical suppliers frequently invoke commercial confidentiality to withhold exact structural identities of dispersion packages. When a masterbatch manufacturer maintains confidential control over wax blends, surface treatments, and colorant recipes, downstream converters receive declarations containing generic statement blocks. These generic statements certify compliance with overall migration limits without disclosing specific chemical species subject to Specific Migration Limits (SMLs) or toxicological thresholds.

Trade secrecy routinely hinders complete hazard assessment.

Without full chemical transparency, downstream converters cannot design targeted migration testing protocols or perform accurate risk assessments under Article 19 of Regulation (EU) No 10/2011. The responsibility for ensuring finished article safety rests legally with the entity placing the final packaging product on the market. When the masterbatch supplier shields additive chemistries behind non-disclosure agreements or vague documentation, the final converter assumes unquantified legal and financial liabilities for unlisted migrants.

Upstream Declaration Truncation across Sourcing Tiers

Information transfer breaks down when colorant manufacturers issue certificates that cover raw powder rather than processed pellets. A pigment supplier certifies that a raw organic pigment meets Council of Europe Resolution AP (89) 1 or EU Regulation 10/2011 Annex I requirements. The masterbatch compounder forwards this raw pigment declaration to the packaging converter, implying complete concentrate compliance.

The step-by-step documentation verification procedure below outlines the audit workflow required to uncover missing NIAS data in masterbatch supply chains:

1. Request the raw masterbatch Declaration of Conformity and cross-reference stated input substances against Annex I of Regulation (EU) No 10/2011.
2. Identify all listed substances subject to Specific Migration Limits, dual-use additive designations, or restriction notes.
3. Demand explicit written confirmation regarding the presence of non-intentionally added substances, including pigment breakdown products, wax degradation species, and trace synthesis residues.
4. Compare masterbatch processing temperature limits against the converter’s actual extrusion or injection molding thermal profiles to verify operational validity.
5. Commission an accredited independent laboratory to perform non-targeted screening (GC-MS, LC-MS) on the exact concentrate lot when upstream suppliers refuse chemical disclosure.

This documentation cascade creates a false sense of compliance. The pigment certificate covers only the uncompounded powder; it does not evaluate thermal degradation products generated when the pigment is extruded at 260 °C with polyolefin waxes and carrier resins. Furthermore, masterbatch compounders rarely declare dual-use additives (food additives like glycerol monostearate or titanium dioxide authorized for direct food insertion) with sufficient quantitative precision for food packagers to verify total compliance against food category limits.

Extrapolating raw material compliance to finished articles ignores conversion chemistry.

Article 15 and Annex IV of Regulation (EU) No 10/2011 specify that declarations must provide adequate information regarding substances with specific restrictions to allow downstream operators to ensure compliance. When a masterbatch declaration uses disclaimer language stating that compliance verification remains the sole responsibility of the converter without providing necessary chemical identification data, the declaration fails the legal adequacy standard established under EU packaging regulations.

A declaration of conformity that certifies input raw materials without disclosing specific migration limits and NIAS assessment protocols fails to satisfy legal compliance requirements under European packaging laws.

Downstream converters who accept incomplete declarations assume direct regulatory exposure. In enforcement actions, food safety authorities reject supplier disclaimers, holding the final packaging distributor accountable for unmasked chemical migration. Standardized supply contracts require specific, enforceable compliance clauses that compel masterbatch compounders to provide detailed analytical backup files or grant third-party accredited laboratories confidential access to proprietary chemical formulations.

“The seller guarantees that the supplied masterbatch concentrate complies with Regulation (EU) No 10/2011, and agrees to provide an accredited third-party laboratory with the complete quantitative chemical composition, including all dispersing aids, waxes, pigment impurities, and identified non-intentionally added substances, for the sole purpose of non-targeted migration screening verification.”

Melt

Thermomechanical stress during plastic conversion induces thermal breakdown in both additives and polymer backbones. Twin-screw compounding extruders operate under high shear forces and barrel temperatures ranging from 180 °C to 300 °C, depending on the carrier polymer. These thermal profiles break down unstable organic molecules, kicking off free-radical chain reactions that create secondary non-intentionally added substances not present in ambient raw materials.

Thermal degradation severity depends on residence time, shear rate, barrel atmosphere, and screw profile configuration. Extended residence time inside molten polymer zones allows sacrificial antioxidants to consume reactive oxygen species, generating oxidized transformation products. When barrel temperatures exceed degradation onset thresholds for organic colorants, azo bonds cleave, phthalocyanine rings destabilize, and long-chain dispersing waxes undergo random thermal cracking.

Thermo-Mechanical Degradation Dynamics in Extrusion

High shear forces inside twin-screw barrels elevate kinetic melt temperatures well above set heating zones. Localized thermal spikes exceeding 320 °C break low-molecular-weight polyethylene waxes into short-chain alpha-olefins, internal alkenes, and volatile alkanes. These volatile hydrocarbons cause taste and odor off-notes in bottled water and aqueous food packaging, failing organoleptic compliance tests under Regulation (EC) No 1935/2004 Article 3.

Thermal degradation during processing generates secondary migrants.

Organic pigments containing halogenated aromatic moieties, such as Pigment Violet 23 or Pigment Red 254, release micro-quantities of hydrogen chloride or chlorinated aromatic fragments under high shear processing. These acidic thermal breakdown products catalyze further degradation of phenolic antioxidants and carrier polymer chains. Standard analytical screening of raw masterbatch pellets misses these secondary degradation products if screening samples are not subjected to the exact thermomechanical profiles used during final conversion extrusion.

Secondary Reactions of Thermal Stabilizers and Antioxidants

Hindered phenols added to protect polymer chains undergo sacrificial oxidation during high-temperature processing. Primary antioxidants like Irganox 1010 or Irganox 1076 scavenge alkylperoxy radicals, converting into quinone methides, 2,4-di-tert-butylphenol, and complex dimeric transformation products. Secondary phosphite antioxidants like Irgafos 168 oxidize to phosphate esters while releasing 2,4-di-tert-butylphenol and reactive organophosphorus fragments.

Examining the chemical pathways of azo pigment breakdown under high shear stress shows that the cleavage of diarylide yellow pigments yields primary aromatic amines, which are classified as category 1A or 1B carcinogens. Under Regulation (EU) No 10/2011 Annex I, primary aromatic amines carry a non-detectable migration limit with an analytical detection threshold of 0.002 mg/kg per individual amine or 0.01 mg/kg for total amine sum.

Processing parameters directly alter chemical transformation rates.

Higher extrusion temperatures increase transformation product concentration exponentially. A masterbatch compounded cleanly at 200 °C can generate primary aromatic amine levels exceeding 0.005 mg/kg when converted into final packaging films at 270 °C. Analytical screening protocols that test color concentrates under mild laboratory conditions fail to capture the chemical species produced under severe industrial conversion parameters.

Thermal history during polymer conversion changes the chemical composition of additive packages, generating reactive transformation products absent in raw inputs.

Evaluating masterbatch safety requires testing samples processed under worst-case thermal and shear conditions. Testing facilities that analyze raw concentrate pellets rather than converted film or molded specimens produce false negatives, certifying safety for materials that decompose during commercial processing.

Minor thermal discoloration during high-speed extrusion can reflect either standard additive activation or active chemical degradation of the pigment dispersion package.

Ledger

Commercial exposure arising from non-compliant packaging components affects every entity along the distribution chain. When regulatory enforcement authorities detect unmapped migrants or non-compliant non-intentionally added substances in food-contact materials, economic penalties extend beyond immediate batch rejections. Market surveillance enforcement actions trigger product recalls, inventory write-offs, custom detentions, and mandatory public border rejection notifications under mechanisms like the European Union Rapid Alert System for Food and Feed (RASFF).

Financial liabilities propagate backward from brand owners to converters and masterbatch compounders. If a food packager suffers retail product withdrawal due to chemical migration exceeding legal limits, damages encompass wasted food product, retail slotting fees, logistics costs for incineration, and brand equity damage. Standard purchase orders containing broad indemnity clauses transfer these landed-cost liabilities back to the packaging converter, who in turn seeks recourse from masterbatch suppliers.

Financial Exposure from Regulatory Non-Compliance

Market surveillance authorities in the European Union execute systematic border checks and retail sampling under official control regulations. Detection of unapproved primary aromatic amines above 0.002 mg/kg triggers immediate border rejection of imported packaging shipments. Customs holds generate port storage fees, demurrage costs, and mandatory destruction orders, accumulating landed losses that rapidly outstrip the total commercial value of the masterbatch shipment.

Product recalls further amplify these commercial losses.

Under US Food and Drug Administration (FDA) regulations, marketing packaging materials containing unapproved food additives or unlisted migrants renders the food product adulterated under Section 402(a)(2)(C) of the Federal Food, Drug, and Cosmetic Act. Mandatory market withdrawals in the United States expose packagers to class-action litigation, regulatory fines, and loss of distribution agreements across retail networks.

Testing Cost Structures versus Recall Liabilities

Budgeting for comprehensive analytical screening requires balancing upfront laboratory fees against potential market enforcement actions. High-resolution mass spectrometry screening (GC-QTOF-MS and LC-QTOF-MS) with non-targeted unknown identification costs between 2,500 EUR and 6,000 EUR per masterbatch formulation batch. In contrast, standard targeted screening packages run between 400 EUR and 800 EUR, but miss non-targeted breakdown products and complex oligomers.

Screening failures in masterbatch batches increase downstream recall liabilities by 350000 EUR per packaging line. Investing in full chemical characterization and targeted migration testing represents a tiny fraction of potential recall expenditures, yet converters frequently select cheaper, inadequate testing packages to minimize immediate operational expenses.

Packaging tax regulations across European jurisdictions modulate fees based on recycled content and recyclability performance. Non-compliant color concentrates containing non-intentionally added substances disrupt mechanical recycling streams, reducing post-consumer resin purity. Concentrates formulated with heavy-metal catalysts or halogenated pigments face elevated producer responsibility fee surcharges, directly increasing per-unit packaging costs.

Comprehensive analytical files protect commercial margins.

Failure to establish a robust compliance dossier leaves converters unable to defend their products during regulatory audits or commercial disputes. Establishing verification protocols creates traceable analytical documentation that shields converters from strict liability enforcement, proving compliance with due diligence mandates under global food contact governance frameworks.

Accepting unvalidated masterbatch screening reports exposes packaging converters to full product recall costs and border rejection liabilities that dwarf initial testing savings.

When a non-compliant concentrate leads to a retail market recall, the converter carries direct financial responsibility for inventory destruction, retail penalties, legal fees, and operational downtime. Skimping on high-resolution analytical screening shifts unquantified toxicological and financial liabilities onto the balance sheet, where a single compliance breach can eliminate annual operating margins.

Remedy

Closing analytical gaps in masterbatch screening demands structured raw-material qualification procedures. Relying solely on supplier certificates of analysis is insufficient to confirm food contact compliance. Converters and compounders must establish hybrid analytical workflows that combine untargeted mass spectrometry screening, thermal process simulation, and rigorous supply chain contractual standards.

The primary step in an effective risk mitigation framework is establishing a dynamic analytical protocol for raw color concentrates. Masterbatch samples must undergo worst-case thermomechanical processing in a pilot extrusion line before analytical extraction. This step generates realistic degradation profiles, exposing secondary non-intentionally added substances created under industrial conversion temperatures and shear stresses.

Targeted Multi-Detector Extraction Workflows

Comprehensive characterization of masterbatch volatile and non-volatile fractions requires paired mass spectrometry techniques. High-resolution LC-QTOF-MS isolates polar degradation products, oligomeric species, and primary aromatic amines down to the 0.002 mg/kg regulatory limit. Complementary Headspace GC-MS screens for volatile organic compounds and thermal breakdown products causing organoleptic failures.

Custom analytical libraries close detection gaps.

To overcome spectral library deficiencies, analytical laboratories must compile custom spectra databases incorporating common pigment degradation products, oxidized wax markers, and synthetic oligomer profiles. Combining high-resolution accurate mass measurements with targeted collision-induced dissociation (CID) fragmentation allows chemists to determine exact molecular formulas and structural configurations for unknown peaks, replacing high-uncertainty surrogate estimates with precise structural assignments.

Supply Chain Audit Clauses for Masterbatch Sourcing

Legal agreements governing color concentrate procurement establish explicit chemical transparency standards. Sourcing contracts must compel masterbatch compounders to disclose full additive formulations, dispersing wax origins, and raw pigment synthesis parameters to accredited third-party laboratories under binding non-disclosure agreements.

The decision checklist below outlines essential verification steps for masterbatch procurement and qualification:

• Thermal Profile Matching confirms that laboratory screening samples were processed under temperature and shear conditions matching or exceeding downstream conversion profiles.
• High-Resolution Mass Spectrometry Screening mandates non-targeted GC-QTOF-MS and LC-QTOF-MS analysis with detection limits extending down to 0.01 mg/kg for uncharacterized unknowns.
• Third-Party Transparency Agreements secure complete quantitative formulation disclosure to accredited testing facilities while protecting compounder trade secrets.
• Batch-Specific Certification requires masterbatch suppliers to issue lot-traced certificates of analysis confirming absence of restricted primary aromatic amines and heavy metal catalyst residues.
• Sensory Evaluation Testing verifies that volatile organic degradation products do not induce taste or odor off-notes in food simulants under standardized storage tests.

Integrating batch-specific Certificate of Analysis (CoA) checks ensures that incoming concentrate lots maintain consistent chemical purity. Standardized CoAs must report specific quality parameters, including residual monomer levels, trace metal content via ICP-MS, and volatile organic compound emissions via headspace GC-MS. Masterbatch lots exceeding established baseline thresholds are held in quarantine prior to processing.

Verification protocols transform compliance from a static paperwork exercise into an active quality assurance discipline. By enforcing rigorous analytical screening, demanding full supply chain transparency, and testing materials under realistic conversion conditions, converters eliminate analytical blind spots. This systematic approach protects food safety, ensures regulatory compliance, and safeguards commercial operations across global packaging supply chains.