Biphenyl (CAS 92-52-4), also known as diphenyl or phenylbenzene, is a planar aromatic hydrocarbon consisting of two benzene rings joined by a single carbon–carbon bond, with the molecular formula C₁₂H₁₀ and a molecular weight of 154.21 g/mol. It presents as a white to colourless crystalline solid with a pleasant odour, a melting point of 69–72 °C, a boiling point of 255 °C, a flash point of 113 °C, and negligible water solubility. Its commercial identity is defined by a property that few aromatic hydrocarbons combine at industrial scale: biphenyl forms a eutectic mixture with diphenyl oxide (DPO) at approximately 26.5% biphenyl and 73.5% DPO, and that eutectic—sold commercially as Dowtherm A and Therminol VP-1—is the reference liquid-phase heat-transfer fluid for high-temperature industrial processing and concentrated solar power (CSP) thermal storage, thermally stable from roughly 12 °C to 400 °C.That single physical fact anchors the largest volume application of biphenyl and explains why its demand is tied to thermal-management infrastructure rather than to any single chemical derivative. But biphenyl is not only a heat-transfer component. It is a dye carrier for polyester in disperse-dye systems, a fungistat in citrus packaging where its vapour suppresses blue and green mould sporulation, a chemical intermediate for APIs, agrochemicals and high-performance polymers, and, at ultra-high purity, a building block for OLED host matrices and liquid-crystal compounds.The global market reflects this bifurcation between high-volume technical grade and rapidly expanding premium grades: the biphenyl market was valued at USD 290 million in 2025, forecast to reach USD 305.8 million in 2026 and USD 505.5 million by 2035 at a 5.7% CAGR, with technical/industrial grade accounting for 44.7% of 2025 demand and electronic/LCD and pharmaceutical/analytical grades outpacing commodity volume growth.For buyers, the qualifying question is not “what does a tonne of biphenyl cost” but “which purity grade, isomer profile and documentation package does my heat-transfer, dyeing or electronic application actually require”—and, in an import-dependent market, “can my supplier prove that the lot meets that specification lot by lot.”
Core Application Fields and Demand Architecture
Biphenyl demand concentrates in four functional arenas where its aromatic stability, eutectic behaviour and ultra-high-purity potential deliver performance that alternative aromatics cannot replicate at equivalent thermal or electronic performance: heat-transfer fluids and thermal storage, dye carriers and textile processing, chemical intermediates and agrochemicals, and electronic and liquid-crystal materials.
In heat-transfer fluids and thermal storage, biphenyl is the eutectic partner that gives Dowtherm A and Therminol VP-1 their liquid-phase operating range. The eutectic mixture of biphenyl and diphenyl oxide is thermally stable in the 12–400 °C range and is used in industrial processing, chemical plants and concentrated solar power thermal storage, where long-duration thermal stability is the governing requirement.The Middle East and Africa region is the fastest-growing geography for this application, expanding at a 7.20% CAGR through 2035, driven by CSP projects and petrochemical complexes.The specification logic here is purity and eutectic consistency: a biphenyl lot that carries sulfur, chlorine or heavy-aromatic impurities can shift the eutectic point, accelerate fluid degradation or foul heat-transfer surfaces, and the operator discovers the problem after the fluid is charged, not in incoming QC. This is the segment where volume is largest and where lot-level certificate-of-analysis data on purity and trace impurities is non-negotiable.
In dye carriers and textile processing, biphenyl functions as a carrier for disperse dyes on polyester and triacetate fabrics. The eutectic mixture of biphenyl and naphthalene is an efficient, high-strength disperse-dye carrier with good lightfastness, and biphenyl is used alone or in isomeric mixtures in aqueous dye-bath systems for hydrophobic synthetic fibres.The specification logic is carrier activity and volatility: a lot with inconsistent particle size or residual solvent can produce uneven dye uptake or spotting, and the dyer discovers the defect after the batch is shaded.
In chemical intermediates and agrochemicals, biphenyl serves as an intermediate in the synthesis of active pharmaceutical ingredients, agrochemicals, high-performance polymers and polysulfone/polyethersulfone resins.It is also used in organic synthesis and as a precursor for other biphenyl derivatives. Historically, biphenyl was the principal intermediate for polychlorinated biphenyls (PCBs), but that use ceased in the mid-1970s when PCB manufacture was prohibited; it remains relevant only as a historical note in the regulatory file, not as a current demand driver.The specification logic for this segment is isomeric purity and low trace metals, because a biphenyl intermediate that carries palladium, iron or halogen residues can poison downstream catalysis or introduce colour.
In electronic and liquid-crystal materials, ultra-high-purity biphenyl is a building block for OLED host matrices, liquid-crystal compounds and organic electronic materials, where its conjugated aromatic system and high purity support charge transport and device stability.Electronic-grade biphenyl is specified at 99.5–99.99% purity with low sulfur and low chlorine, and the leading commercial grades are positioned for pharmaceutical, agrochemical and electronic use.The specification logic is the most demanding in the market: trace metals, sulfur and chlorine must be controlled at parts-per-million or lower levels, and a lot that carries an ionic impurity can degrade the resistivity or voltage-holding ratio of a liquid-crystal mixture. This is the fastest-growing premium segment, and it commands a price realisation that technical-grade heat-transfer material does not.
Regulatory Profile: Not an SVHC, Not PBT/vPvB, but a Hazardous Substance with Aquatic and Irritation Classifications
Biphenyl’s regulatory position is not one of CMR-driven restriction, but it is also not a “documentation-free” aromatic. The operative facts are: not an SVHC, not PBT/vPvB, not classified as an endocrine disruptor in the available SDS documentation, but classified for skin and eye irritation, respiratory irritation and very high aquatic toxicity. The REACH registration status is inconsistent across sources: one SDS states that the substance has no registration number because it falls below the REACH Article 6(1) threshold and is not subject to Title II registration requirements, while other data sources record an EC number and a REACH registration reference.For buyers, this means the supplier’s lot-specific REACH statement is more reliable than a catalogue field.
The CLP classification is the operative hazard. Biphenyl carries Skin Irrit. 2 (H315), Eye Irrit. 2 (H319), STOT SE 3 (H335, respiratory irritation), Aquatic Acute 1 (H400) and Aquatic Chronic 1 (H410). The signal word is Warning in the harmonised classification, with hazard statements covering skin irritation, serious eye irritation, respiratory irritation and very high aquatic toxicity with long-lasting effects.It is not classified as a carcinogen, mutagen or reproductive toxicant, and the SDS confirms that the substance does not meet the PBT/vPvB criteria of REACH Annex XIII and does not contain known or suspected endocrine disruptors.The practical consequence is that biphenyl requires standard industrial-hygiene controls—dust control, eye protection, gloves and ventilation—and strict environmental-release precautions, but it does not trigger the CMR-driven containment regime that applies to many chlorinated or aminated aromatics.
The transport and handling profile is that of a solid aromatic with a flash point of 113 °C, which is above the threshold for flammable-liquid classification in most jurisdictions. The material is typically supplied in 25 kg bags, fibre drums or bulk bags, and storage requires a dry, cool, well-ventilated area with containers kept tightly closed to prevent caking and moisture pickup. Biphenyl is not regulated as dangerous goods under IATA or IMDG in its solid form, which simplifies air and sea freight relative to liquid aromatic solvents.
The Russian and EAEU position is governed by sanitary-hygienic norms rather than by REACH. The Russian ambient-air standard for biphenyl (1,1′-biphenyl, CAS 92-52-4) is recorded at 0.001 mg/m³ as a daily average, with a hazard classification consistent with a highly hazardous aromatic; working-area limits and the applicable hazard class must be confirmed against the current ГН 2.1.5 and СанПиН 1.2.3685-21 tables for the specific grade and physical form.Imported material must be accompanied by a Russian-language SDS that states the applicable limits and required engineering controls, and downstream users in pharmaceutical and electronic applications will require lot-level purity data against the specification their process was validated around.
Global Supply Structure and Manufacturer Differentiation
Global biphenyl supply is moderately concentrated at the high-purity and electronic-grade end and more fragmented at the technical-grade end. The producer landscape identified in market reporting includes Eastman, LANXESS, Synerzine, Biosynth Carbosynth, Radco Industries, Watson, 贝达实业, 三恩化工, 大连丰瑞化学 and 鞍钢实业三块石化工厂, alongside a cohort of Chinese producers serving domestic and export demand.One Chinese producer has stated a biphenyl capacity of over 8,500 tonnes per year, and another has positioned an electronic-grade product at 99.99% purity with low sulfur and low chlorine for pharmaceutical, agrochemical and electronic applications.The market is structurally bifurcated: technical/industrial grade for heat-transfer fluids and agrochemical synthesis accounted for 44.7% of 2025 demand, while electronic/LCD and pharmaceutical/analytical grades command higher unit realisations and are outpacing commodity volume growth.
Differentiation operates on three axes that matter more to a heat-transfer engineer or a liquid-crystal formulator than the headline purity figure. The first is purity and trace-impurity control for eutectic stability. In heat-transfer service, sulfur, chlorine and heavy-aromatic impurities can shift the eutectic point and accelerate fluid degradation. A supplier that controls these impurities within narrow limits and documents them lot by lot can serve CSP and industrial thermal-management accounts that a technical-grade supplier cannot. The second axis is electronic-grade purity and consistency. OLED and liquid-crystal applications require 99.5–99.99% purity with controlled trace metals, sulfur and chlorine, and a lot that carries an ionic impurity can degrade device performance. A supplier that reports lot-specific GC purity and trace-metal data, rather than a catalogue nominal, reduces the qualification burden for electronic customers. The third axis is documentation and language support for import-dependent markets. Biphenyl is a solid aromatic with aquatic-toxicity and irritation classifications, and Russian and EAEU buyers require a Russian-language SDS that states the 0.001 mg/m³ ambient limit and the applicable working-area controls, alongside lot-level certificate-of-analysis data. A supplier that can provide that package, and arrange logistics for a non-dangerous-goods solid, reduces the clearance and qualification burden.
Regional Demand Dynamics
Biphenyl demand is regionally asymmetric in a way that follows thermal-infrastructure investment, polyester textile production and electronic-manufacturing capacity rather than the geography of benzene feedstock.
Asia-Pacific is the centre of gravity for both supply and demand, accounting for approximately 47.4% of global market revenue in 2025 (USD 144.31 million), driven by China’s chemical-synthesis base and India’s pharmaceutical API expansion.China is the largest producer and consumer, supporting heat-transfer-fluid production, polyester dyeing, agrochemical intermediates and a growing electronic-materials sector. India contributes through API and agrochemical synthesis, and its pharmaceutical expansion is one of the structural drivers of demand for high-purity biphenyl intermediates.The region’s demand is bifurcated between cost-sensitive technical-grade applications and specification-sensitive electronic and pharmaceutical grades, and the documentation bar is rising as export-oriented manufacturers align with European and North American customer expectations.
North America holds the second-largest position at USD 72.27 million in 2025, with the United States representing 88.5% of regional demand.Demand is anchored in heat-transfer fluids for industrial processing, polyester dyeing and chemical intermediates, with a strong regulatory-affairs culture that places a premium on lot-specific purity and SDS documentation. Europe accounts for USD 60.10 million in 2025, and its demand is shaped by REACH compliance, CSP thermal-storage projects in southern Europe and a strong preference for documented high-purity material in electronic and pharmaceutical applications.
The Middle East and Africa is the fastest-growing region, valued at USD 12.98 million in 2025 and forecast to expand at a 7.20% CAGR through 2035, propelled by petrochemical complexes and CSP thermal-storage projects.This is the geography where biphenyl’s heat-transfer function is growing fastest, and where the specification logic is dominated by eutectic stability rather than by electronic purity.
Russia and the EAEU form an import-dependent contour with a specific documentation requirement. Biphenyl is supplied for heat-transfer fluids, dye carriers, chemical intermediates and a smaller electronic and analytical segment, and there is no large-scale domestic production at electronic or high-purity grade. The ambient-air standard of 0.001 mg/m³ and the irritation/aquatic classifications mean that industrial-hygiene documentation is non-negotiable, and downstream pharmaceutical and electronic users require lot-level purity data against the specification their process was validated around. Russian suppliers exist for technical-grade material—one Moscow-based supplier lists biphenyl in 25 kg bags at an indicative price point of approximately 262 RUB/kg for technical-grade material—but the high-purity and electronic-grade supply is import-dependent.The practical qualification task for Russian buyers is to verify purity, trace-impurity profile and Russian-language SDS against the application, because a lot that meets a “technical” purity figure may still fail a heat-transfer or electronic specification.
Future Outlook and Strategic Imperatives
The biphenyl market will grow at a moderate rate—5.7% CAGR by value through 2035 in the base case, with technical grade at 44.7% of 2025 demand and premium grades outpacing commodity volume—but the composition of that growth is shifting toward electronic-grade and CSP-driven heat-transfer demand.Three structural forces will shape competition.
First, premiumisation of electronic-grade demand will separate suppliers with trace-impurity control from those selling technical grade. OLED host matrices and liquid-crystal compounds require 99.5–99.99% purity with controlled sulfur, chlorine and trace metals, and the growth of Asian electronic supply chains is pulling demand for material that technical-grade producers cannot supply.Second, CSP thermal storage will remain the volume anchor and the fastest-growing heat-transfer application. The Middle East and Africa region’s 7.20% CAGR is the clearest expression of this, and the specification logic is eutectic stability and long-duration thermal performance rather than electronic purity.Third, documentation depth and language support will be a qualification gate in import-dependent markets. The Russian 0.001 mg/m³ ambient limit, the irritation and aquatic classifications, and the absence of domestic high-purity production mean that a Russian-language SDS and lot-level analytical data are conditions of entry, not differentiators.
For Russian and EAEU buyers, the strategic implication is that biphenyl procurement should be treated as a grade-and-documentation partnership rather than a price comparison. A lot that carries sulfur or heavy-aromatic impurities above the heat-transfer specification can shift the eutectic point and degrade a CSP or industrial fluid system; a lot that carries trace metals above the electronic specification can degrade a liquid-crystal mixture. A shipment that arrives without a Russian-language SDS stating the 0.001 mg/m³ limit, or without lot-specific purity data, can be delayed at customs or rejected by a downstream customer’s qualification team. The lowest-risk supplier is the one that can match the grade to the application, document purity and trace impurities lot by lot, and support the buyer with Russian-language documentation and reliable logistics for a solid aromatic that is entirely import-dependent at high-purity grade—the position XINCHEM occupies for biphenyl in the Russian and EAEU market.
Shanghai XinChem Co., Ltd. (XinChem)
As a world-leading supplier of organic chemicals, Shanghai XinChem Co., Ltd. (XinChem) offers biphenyl (CAS 92-52-4) in technical-grade, heat-transfer-grade and high-purity electronic-grade specifications, serving heat-transfer-fluid formulators, CSP thermal-storage operators, polyester dyeing and textile processors, agrochemical and pharmaceutical intermediate producers, and OLED and liquid-crystal material developers. Our biphenyl is supplied with controlled purity and trace-impurity profile, lot-specific certificate-of-analysis data, and the documentation support—including Russian-language SDS with the 0.001 mg/m³ ambient limit and lot-level purity data for electronic and heat-transfer qualification—that grade-specific sourcing and cross-border supply require.
Technical and Quality Advantages
Grade-Specific Purity and Trace-Impurity Control: Biphenyl is supplied against technical, heat-transfer and electronic-grade specification windows, with sulfur, chlorine and heavy-aromatic impurities controlled to the limits relevant to the intended use. In heat-transfer service, these impurities shift the eutectic point and accelerate fluid degradation; in electronic service, they degrade device performance. Lot-level data is the specification that determines whether the lot can enter a CSP fluid system or an OLED host-matrix synthesis, not just a general-purpose aromatic application.
Eutectic-Relevant Documentation: For heat-transfer customers, XinChem provides lot-specific purity and trace-impurity data that supports the buyer’s eutectic-point and fluid-stability assessment. Because the biphenyl–DPO eutectic is defined by composition, a supplier that documents the impurity profile against the eutectic specification reduces the risk of a fluid that underperforms in service.
Electronic-Grade Purity Data: For OLED and liquid-crystal applications, high-purity biphenyl is characterised for GC purity and trace metals, with lot-level certificate-of-analysis data supporting the buyer’s device-qualification process. This is the documentation layer that separates an electronic-grade lot from a technical-grade lot sold into a purity-sensitive application.
Russian-Language SDS and Sanitary Documentation: Safety data sheets are available in Russian and English, with documentation covering the H315, H319, H335, H400 and H410 classifications, the 0.001 mg/m³ ambient limit, and the handling and environmental-release precautions required for a solid aromatic with aquatic-toxicity classification. This package reduces clearance friction and supports the buyer’s industrial-hygiene and environmental compliance file.
Packaging and Logistics Flexibility
Biphenyl is available in 25 kg bags, fibre drums and bulk bags for technical, heat-transfer and electronic-grade quantities, with sealed containers for pilot and laboratory qualification. For Russia and EAEU destinations, XinChem arranges logistics with Russian-language SDS and certificate-of-analysis support, reducing clearance friction for a solid aromatic that is imported rather than domestically produced at electronic or heat-transfer grade.
Application Support and Supply Reliability
XinChem’s technical team assists with grade selection for heat-transfer-fluid formulation, CSP thermal storage, polyester dyeing, agrochemical and pharmaceutical intermediate synthesis, and OLED and liquid-crystal material development, and with the purity, trace-impurity and documentation requirements that heat-transfer and electronic qualification demand. Supply schedules accommodate both qualification orders and contract volumes, with stock and logistics planning aligned to the benzene feedstock dynamics and trade flows that shape biphenyl availability.
Why Choose XinChem
Expertise: Deep experience in aromatic hydrocarbons and high-purity intermediates, with application knowledge spanning heat-transfer fluids, CSP thermal storage, polyester dyeing, agrochemical synthesis and electronic materials.
Consistency: Control of purity and trace impurities against grade-specific specifications—the parameters that determine whether biphenyl stabilises a eutectic heat-transfer fluid or shifts its operating range, and whether an electronic-grade lot meets a device specification or introduces a trace-metal defect.
Compliance Readiness: Documentation structured around the non-SVHC, non-PBT/vPvB status, the H315/H319/H335/H400/H410 classifications, the Russian 0.001 mg/m³ ambient limit, and lot-level purity data for heat-transfer and electronic qualification, with Russian-language SDS support.
Responsiveness: Direct technical and commercial access, with order structures from qualification quantities to bulk and contract supply.
Contact us now to discuss your biphenyl requirements and request a specification sheet or qualification sample.
Website: www.xinchem.com
Email: sales1@xinchem.com
WhatsApp: +86 18049800532
Post time: Nov-12-2026