Ultraviolet Absorber UV-360:Exports & Compliance White Paper 2026

I. Executive Summary

UV absorber UV-360 (CAS 103597-45-1) is the high-molecular-weight bis-benzotriazole absorber 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], used to stabilise engineering plastics, coatings, optical films and automotive systems. Nobody can specify a benzotriazole stabiliser without deciding how that family's regulatory status will be tracked: several members have been assessed as persistent, bioaccumulative and toxic under REACH, some are on the SVHC Candidate List, and UV-328 has been listed under the Stockholm Convention.

The commercial case rests on permanence. With a molecular weight far above monomeric absorbers, UV-360 resists volatilisation during high-temperature processing of polycarbonate, PET, polyamide and PMMA, resists extraction, and migrates slowly from the host polymer. That profile fits the move towards low-migration, high-permanence packages. It remains a technical argument to validate rather than a compliance conclusion: molecular weight reduces migration tendency, but does not settle persistence or bioaccumulation, which are assessed substance by substance.

This paper serves stabiliser buyers, compounders and compliance teams. It sets out the quality specification that actually separates lots, the application criteria against which the grade is qualified, and the European, United States and Asian instruments governing its trade, including the single-source portfolio model through which most polymer additives are bought.

II. Product Deep Dive: Molecular Mechanisms and Production Evolution

2.1 Physicochemical Properties and Mechanisms

Performance follows from the chromophore. Each benzotriazole ring absorbs strongly between roughly 300 and 400 nanometres and dissipates the energy harmlessly as heat through excited-state intramolecular proton transfer, regenerating the ground state. Because that cycle repeats thousands of times, absorbers rather than quenchers carry the ultraviolet load in thick sections.

• Absorption profile and spectral coverage: Paired chromophores with phenolic and alkyl substitution give high specific extinction at loadings typically between a few tenths of a percent and about one percent. Protection then rises with section thickness in line with the Lambert-Beer relationship, which is why the absorber dominates in thick sections and contributes far less in thin films.
• Complementarity with hindered amine light stabilisers: Absorbers remove the photon; hindered amine systems interrupt the radical chain once initiation has happened. Practical packages combine a benzotriazole absorber with a hindered amine stabiliser, an antioxidant and a phosphite, and the balance is formulation-specific. Basic hindered amines interact with acidic components, so packages must be validated in the actual polymer.

2.2 Synthesis and Manufacturing Technologies

At route-class level, the benzotriazole chromophore is built by azo coupling and reductive cyclisation from substituted ortho-nitroaniline precursors, followed by attachment of the octyl-substituted phenol and methylene bridging of two units with formaldehyde under acid catalysis. The differentiators sit downstream, in purification, residual control, metals management and crystallisation into a reproducible physical form.

• Purification, residual monomer and metals control: Commercial value is decided by what is removed. Residual phenol, intermediates and iron from reduction degrade colour and catalyse polymer degradation, so processes apply repeated washes, adsorptive treatment and recrystallisation. Finished lots are judged on ash, iron and metals by ICP-OES, residual phenol and free benzotriazole by chromatography, and volatiles by thermogravimetric loss, because these residuals separate qualified from marginal supply.
• Physical form engineering and low-dust delivery: The product is a free-flowing powder of defined particle size and melting range, sometimes delivered as low-dust agglomerate or masterbatch. Particle size governs dispersion: coarse particles risk undissolved specks in film and fibre, while fine powders create dust, housekeeping problems and bridging in feeders. Processors increasingly request such forms, and each change must be re-qualified because dispersion alters even when the molecule does not.

2.3 Core Application Matrix

• Engineering plastics and transparent glazing: Polycarbonate, PMMA, PET, PBT, polyamide, rigid PVC and thermoplastic polyurethane all use the grade, polycarbonate being the demanding case because processing above 280 degrees Celsius leaves no margin for volatilisation. Where the article contacts food, the system must satisfy the specific migration limits of EU Regulation 10/2011 and applicable FDA 21 CFR provisions for the host polymer, with the supplier delivering supporting migration data.
• Automotive coatings and exterior weathering: Exterior plastics, clearcoats and coil-coated trim are qualified against accelerated weathering rather than composition. Standard cycles such as SAE J2527 and ISO 4892, followed by colour shift, gloss retention, yellowing index and retained impact strength, decide acceptance, with most original equipment manufacturers layering their own specifications above those methods. Supplying absorption spectra and migration data alongside the results also matters, because auditors want the mechanism documented.
• Optical films, electronics and encapsulation: Optical films, displays and encapsulant layers for photovoltaic and battery modules need long-wavelength screening with minimal bloom and minimal interaction with conductors. Low volatility and low migration decide the outcome, since additive reaching an interface degrades adhesion. Here the grade competes directly with hydroxyphenyl triazine absorbers, selected on extraction behaviour and service temperature rather than price.

III. Global Market Supply-Demand Landscape and Export Trends

3.1 Demand Drivers and Market Shifts

The dominant market fact is family scrutiny rather than unit demand. Once UV-328 entered the Stockholm Convention persistent organic pollutants list and cascaded into the EU POP Regulation and the REACH process, stabiliser selection became a substitute-or-justify decision for every polymer converter. Triazine absorbers, benzotriazole-free hindered amine packages and non-benzotriazole chemistries are being pre-qualified in parallel, often at the cost of colour, which is why high-permanence grades retain share.

3.2 Capacity Distribution and Export Flows

Production sits in China, Japan, Germany and the United States: China supplies the largest share of volume with increasingly competitive specification, while Japanese and German houses retain the reputation for tight impurity control in optical and electronics work. Trade follows the portfolio model, in which converters buy stabiliser families rather than molecules, so volumes move with portfolio relationships rather than spot price alone.

3.3 Market Bifurcation and Pricing Dynamics

Pricing bifurcates on documented performance. Standard powder traded on assay and melting range behaves like a commodity, tracking solvent and energy costs, while grades with full metals and residual profiles, migration data and weathering dossiers command a durable premium. Customer qualification costs months of exposure, so switching cost far exceeds the invoice difference.

IV. In-depth Analysis of Global Compliance and Regulatory Barriers

The compliance burden sits less in transport classification than in substance status. Buyers should require documented registration coverage, current classification, and a written commitment to monitor ECHA registrant dossiers and the restriction pipeline for the whole benzotriazole family.

4.1 European Market: REACH, CLP, and Sector-Specific Directives

• REACH registration, PBT/vPvB assessment and SVHC tracking: Registration coverage must be evidenced for the exact substance supplied, and does not end there. Benzotriazole absorbers have been assessed collectively for persistence, bioaccumulation and toxicity; some members have been identified as Substances of Very High Concern and further members remain under review. Buyers should not assume any particular status for UV-360 without checking ECHA directly. Candidate List inclusion triggers communication duties above 0.1 percent by weight and drives substitution; Annex XVII inclusion would restrict the market.
• EU POP Regulation, the Stockholm cascade and consumer-product schemes: The listing of UV-328 under the Stockholm Convention cascaded into EU POP Regulation (EU) 2019/1021, under which listed substances enter Annex I, with consequences beyond intentional use: waste containing listed POPs must be destroyed or irreversibly transformed, and articles in use are reviewed. That makes substitution pressure structural. Separately, products bearing the German GS mark are assessed under the AfPS GS certification process, which examines trace contaminants such as polycyclic aromatic hydrocarbons, so packages must be documented upstream.

4.2 North American Market: TSCA, EPA, and FDA Regulations

• TSCA inventory status and federal risk evaluation: The substance must be listed on the TSCA Chemical Substance Inventory for the commercial use in question, and importers again carry the burden because United States Customs requires a positive or negative TSCA certification at entry. Beyond inventory status, benzotriazoles fall within the persistent and bioaccumulative class scrutinised under EPA's existing-chemical programme, so buyers should expect data requests rather than assume stability, and should build evidence files early.
• California Proposition 65 and downstream food-contact duties: Proposition 65 is a warning scheme rather than a use restriction: exposure to listed chemicals above safe-harbour levels requires clear warning unless exemption is demonstrated. Whoever markets the finished article owns the assessment, so suppliers offering migration, extraction and compositional data remove risk from their customer. Food-contact uses add conformity with FDA clearance for the specific polymer and article.

4.3 The Critical Hurdle: Quality Control and Safety Limits

V. Green Trade Barriers and ESG in Manufacturing

Two ESG questions dominate this chemistry: the footprint and solvent discipline of a multistep synthesis, and the credibility of upstream composition disclosure.

5.1 Carbon Footprint and Circular Economy

A multistep aromatic synthesis with azo coupling, metal-mediated reduction and recrystallisation carries a substantial cradle-to-gate burden, mostly in starting materials, solvent recovery and energy. European plants carry EU Emissions Trading System cost pressure, while exporters face carbon reporting as Carbon Border Adjustment Mechanism phases extend. The counterargument is service life, since stabiliser systems keeping glazing in service for years avoid replacement emissions. Where listed POP content arises, waste requires destruction rather than recovery.

5.2 Sustainable Sourcing and Traceability

Additive confidentiality collides with modern due diligence. Automotive customers must declare composition through material data systems while their chemical management programmes demand full restricted-substance screening, which partial information cannot support. The workable model is disclosure under confidentiality to a nominated auditor, backed by site-level ISO 9001 and ISO 14001 certification and change control covering precursors, solvents and physical form.

VI. Supply Chain Resilience and Export Logistics

The product trades as a solid, which keeps most dangerous-goods questions away, but dust behaviour and thermal history decide whether drums arrive usable.

6.1 Packaging Standards and Moisture/Contamination Control

• Dust control, liners and combustible dust safety: Standard packing is a fibre drum or bag-in-box with a polyethylene liner on a palletised unit. Any organic fine powder is a potential combustible dust, so handling should follow good housekeeping, bonding and earthing practice with local exhaust at transfer points. Clean single-purpose liners prevent carryover, which matters because trace metals or foreign polymer dust cause defects customers attribute to the additive.
• Thermal history, caking and stock rotation: Storage must be cool and dry, because container heat and pressure can cake the powder into material that bridges in feeders and disperses poorly. Specify a maximum storage temperature, require covered storage, and reject or re-mill caked drums rather than charging them. Retest dates, first-expiry-first-out rotation and lot traceability complete the control.

6.2 Dangerous Goods Identification and Transit Protocols

The neat powder is normally not classified as dangerous for transport under ADR, RID, IMDG or IATA, but that conclusion must be taken from the current safety data sheet rather than assumed, and classification can change with physical form, since solvent-based masterbatches and certain blends may fall into flammable-liquid entries. Consolidators should receive heat-history expectations, because container holds in tropical ports cause most caking complaints.

VII. Enterprise Global Expansion Strategy Guide

Three moves determine whether a supplier keeps its position through the current reformulation wave.

1. Run a live regulatory watch instead of a status snapshot: Assign named responsibility for tracking ECHA dossiers, Candidate List updates, restriction proposals and POP listings across the family, with escalation thresholds agreed in advance. Pair every key application with a pre-qualified alternative, usually a triazine absorber or hindered amine-led package, including the measured compromises on colour or processing. Customers value that file because their exposure is reformulation time rather than additive cost.
2. Qualify against OEM weathering protocols rather than data sheets: Commission exposure according to SAE J2527 and ISO 4892 cycles with defined irradiance and moisture phases, then report functional endpoints: colour shift, gloss retention, yellowing index and retained impact strength. Combine that with extraction into food simulants and migration into encapsulant layers, because this converts a sample approval into a platform specification.
3. Compete as a portfolio partner rather than a molecule vendor: Since converters buy stabiliser families from houses that also supply antioxidants, phosphites and hindered amine packages, the route into new accounts is portfolio breadth plus technical service and compounding support. Add documented change control and regional stock in China, Europe and North America, so disruption in one lane does not stop the customer's line.

VIII. Conclusion

UV-360 occupies an unusual position in 2026: well matched to the applications regulators are pressing hardest. High molecular weight and low volatility genuinely support low-migration packages, which is why compounders keep specifying it for glazing, engineering plastics and encapsulation. No buyer should translate those properties into a regulatory forecast. Assessment under REACH and the Stockholm Convention proceeds substance by substance, decided in ECHA dossiers and restriction processes rather than supplier brochures.

The practical response is preparation rather than prediction. Buy the full specification set, including metals, residuals and volatiles, demand upstream composition disclosure under confidentiality, and pre-qualify a triazine or hindered amine-led alternative for every critical application. Suppliers who do this work for their customers will keep programmes that price-based competitors lose, whatever the final regulatory outcome for individual benzotriazoles.

IX. Industry Resource Connection and Supplier Ecosystem

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This white paper is exclusively compiled by the Guidechem Intelligence Team based on global customs data, regulatory databases, and industry research. Guidechem is a leading global B2B chemical platform, dedicated to connecting global buyers with verified, high-quality manufacturers.

Guidechem Global UV absorber UV-360 (2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]) Supplier Ecosystem List

Relying on Guidechem's extensive global database, we have mapped the core participants in the current global UV absorber UV-360 (2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]) supply chain:

• China: volume base with converging specification: Chinese producers supply the largest traded volume, anchored by integrated aromatic intermediates, and have moved up the specification curve in ash, iron and residual control. Export plants hold REACH registrations and ISO systems, increasingly with full analytical packages. The remaining gap to premium suppliers is usually weathering dossier depth and local technical service rather than measured impurity levels.
• Japan: optical and electronics-grade consistency: Japanese additive houses retain the strongest position in film, optical and electronics applications, where tight control of metals, volatiles and particle size matters more than unit price. Their relationships with domestic polymer producers and converters are long-standing and sticky, purchases tend to run on multi-year agreements, and export is frequently handled through dedicated trading structures that protect specification consistency across regions.
• Germany and the United States: portfolio houses and single-source supply: German producers anchor European regulatory-facing business, supplying registered substances with strong documentation and links to automotive OEM approval systems. The United States combines domestic production with compounding capacity, so much material reaches users inside masterbatch rather than neat powder. Both compete on portfolio breadth, selling stabilisers with antioxidants, phosphites and hindered amine packages under single-source agreements.