p-Xylene Supply for Industrial Applications
Aure Chemical works with qualified Chinese producers and supply partners to evaluate p-Xylene requirements for international industrial buyers. p-Xylene, also known as para-Xylene or 1,4-dimethylbenzene, is a single xylene isomer primarily used as an upstream feedstock for terephthalic acid, purified terephthalic acid and selected dimethyl terephthalate process routes.
Product suitability should be evaluated according to the required assay, residual o-Xylene and m-Xylene, ethylbenzene, water, color, nonvolatile residue, process-sensitive trace components and analytical methods. The applicable source, specification, batch documentation, tank arrangement, temperature-management requirements and current availability should be confirmed for each inquiry.
Buyers comparing p-Xylene with other xylene isomers should identify the exact product and CAS number. p-Xylene CAS 106-42-3 is not interchangeable with o-Xylene, m-Xylene or mixed xylenes without process-specific technical review.
Basic Information of p-Xylene
p-Xylene is the para isomer of dimethylbenzene, with two methyl groups located at the 1,4-positions of the benzene ring. It is generally a clear, colorless liquid above its melting range but may crystallize or solidify during cooler storage or transportation conditions. The physical-property values below are reference information; the current specification, SDS and batch documentation for the applicable source should be reviewed before purchase, storage or handling.
| Product Name: | p-Xylene |
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| Chemical Name: | 1,4-Dimethylbenzene |
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| Alternative Names: | Para-Xylene; p-Xylol |
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| CAS No.: | 106-42-3 |
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| EC No.: | 203-396-5 |
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| Molecular Formula: | C8H10 |
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| Molecular Weight: | Approximately 106.17 g/mol |
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| Appearance: | Clear, colorless liquid above its melting range; may crystallize under cooler conditions |
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| Melting Point: | Approximately 13.3°C |
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| Boiling Point: | Approximately 138°C |
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| Density: | Approximately 0.86 g/mL under commonly referenced ambient conditions |
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| Transport Information: | Commonly transported under UN 1307, Class 3, Packing Group III. The applicable classification must be confirmed against the current SDS and shipment documentation. |
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| Chemical Structure: |  |
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p-Xylene Specification and Quality Review
A professional p-Xylene inquiry should include more than a general purity requirement. The relevant quality parameters depend on the oxidation process, catalyst system, purification design, approved feedstock profile and downstream intermediate requirements.
Parameters that may require review include:
p-Xylene assay: The required single-isomer content should be stated together with the analytical method and reporting basis where relevant.
Residual o-Xylene and m-Xylene: The remaining isomer profile may affect oxidation, separation, purification and buyer-specific source qualification.
Ethylbenzene and other aromatic components: These may be relevant to feedstock conversion, separation efficiency and process consistency.
Water, color and appearance: Moisture, color and visible-condition requirements should be agreed before order placement.
Nonvolatile residue: Residual nonvolatile material may require control according to the process and customer specification.
Catalyst-sensitive or process-sensitive traces: Additional components may require review based on the buyer’s oxidation technology and purification requirements.
Analytical methods: Gas-chromatographic area percentage, mass percentage and other reporting bases should not be treated as automatically equivalent.
Batch and source consistency: Buyers may require an approved manufacturer, production site or feedstock profile for recurring supply.
Phase condition: Partial crystallization may affect transfer behavior and sampling representativeness, so the physical condition of the shipment may require review.
A representative or sample COA may support preliminary technical evaluation, but it does not report results for the future shipment batch. A batch COA should identify the applicable production lot and should be compared with the specification agreed in the quotation, contract or purchase order.
Parameters that are not listed on a supplier specification or COA should not be assumed to comply. Where approval is manufacturer- or site-specific, a source change may require advance notification, updated documentation, sampling or requalification.
Principal Applications of p-Xylene
The principal industrial use of p-Xylene is as an upstream feedstock for terephthalic acid and purified terephthalic acid production. It is also connected with selected dimethyl terephthalate routes and the downstream polyester value chain.
Terephthalic Acid and PTA Production: p-Xylene is oxidized to terephthalic acid, which is purified to produce PTA for approved polyester applications.
Dimethyl Terephthalate Production: In selected process configurations, p-Xylene-derived terephthalic intermediates are converted into DMT.
PET Resin Value Chain: PTA or DMT reacts with ethylene glycol to produce PET and other polyester materials.
Polyester Fiber and Film: Qualified polyester grades may be processed into textile or industrial fiber and polyester film.
Selected Chemical Processing: p-Xylene may also be evaluated as an aromatic raw material or process medium where its identity and physical properties meet the application requirements.
p-Xylene for PTA and DMT Production
Terephthalic acid and PTA production represent the principal industrial pathway for p-Xylene. In the common upstream route, p-Xylene is oxidized to terephthalic acid and the resulting intermediate is purified to produce PTA.
In selected process configurations, p-Xylene-derived terephthalic intermediates are used to manufacture DMT. p-Xylene itself is not directly esterified into DMT without an intermediate conversion route.
Feedstock evaluation may include p-Xylene assay, residual isomers, ethylbenzene, water, color, nonvolatile residue, catalyst-sensitive traces and source consistency. The importance of each parameter depends on the plant’s oxidation, separation and purification design.
Buyers evaluating the upstream pathway may review p-Xylene for PTA and DMT production for additional information about feedstock quality, processing context and industrial procurement.
p-Xylene in PET Resin, Polyester Fiber and Film
p-Xylene is not normally added directly to PET polymerization, fiber-spinning or film-extrusion equipment. It first enters the polyester value chain through conversion to PTA or DMT.
PTA or DMT then reacts with ethylene glycol or another approved diol to produce polyester. The resulting polymer may be supplied as resin chips, transferred as polymer melt or converted into bottle-grade PET, polyester fiber or film-grade materials.
Final polymer properties depend on intermediate purity, polymerization control, molecular structure, additives and downstream processing. p-Xylene purity alone does not guarantee the performance of a bottle, fiber or film.
The downstream relationship is explained in p-Xylene in PET resin, polyester fiber and film.
Crystallization, Storage and Temperature Management
p-Xylene has a reference melting point of approximately 13.3°C. It may therefore crystallize or solidify during cool-weather storage, transportation, terminal waiting or destination handling.
Crystallization is generally a reversible physical phase change and does not automatically indicate oxidation, polymerization, contamination or chemical degradation. However, it may restrict pumping, sampling, loading, unloading and internal transfer.
A main tank that still contains liquid does not guarantee that every connected pipeline, valve, hose or fitting remains clear. Smaller external components may cool faster than the bulk liquid, while partial crystallization can create liquid and solid regions within the same shipment.
Partial crystallization may also affect sampling representativeness. A sample taken from one liquid region should not automatically be treated as representative of the complete tank.
Tank insulation and installed heating or thermal-management systems must be confirmed rather than assumed. An insulated ISO tank is not necessarily equipped with a heating system, and heating capability alone does not guarantee successful destination unloading.
Storage and transfer arrangements should be evaluated according to the tank, route, season, expected waiting time, pipeline design and receiving-site capability. Detailed planning considerations are available in p-Xylene crystallization, storage and handling.
Packaging and Bulk Supply Options
Packaging and transportation should be evaluated according to the required quantity, source capability, loading location, destination, transport route, seasonal conditions, applicable regulations and receiving-site infrastructure.
Possible arrangements may include:
Approved drums: May be considered for smaller, trial or qualification quantities where the source, package approval, carrier and route permit.
Approved IBCs: May be evaluated where package approval, chemical compatibility, regulations, carrier acceptance and consignee capability allow their use.
Road tanker: May be considered for domestic, regional or port-transfer movements subject to tank approval, thermal review and local requirements.
ISO tank container: May be evaluated for international bulk-liquid transportation according to tank design, insulation, installed thermal systems, cleanliness, previous cargo, route and receiving capability.
Bulk arrangements are commonly evaluated for industrial volumes, but packaged supply may remain possible where the source and logistics arrangement permit. No universal package size or ISO tank loading quantity applies to every shipment.
Permitted loading depends on the individual tank design, filling conditions, product density, thermal expansion, gross-weight limits, route restrictions and operator approval. Nominal tank volume is not the same as permitted cargo weight.
Buyers may provide their own ISO tank or request evaluation of a supplier-arranged tank. Tank ownership, leasing, cleaning, local movement, thermal-system operation, international freight, destination discharge, detention, demurrage and return responsibilities should be agreed separately from the Incoterm.
Further information is available in bulk xylene packaging and ISO tank transportation.
Tank Compatibility and Receiving-Site Capability
Tank compatibility should cover the vessel material, lining where present, insulation, installed thermal systems, valves, seals, gaskets, hoses, fittings and discharge arrangement. The selected tank must also be accepted by the source, loading facility, tank operator, carrier and receiving site.
Previous cargo may create contamination, odor, analytical or compatibility concerns. Cleaning documentation and previous-cargo information may therefore be required before the tank is approved. A tank that appears visually clean is not automatically acceptable.
The receiving facility should confirm storage capacity, road or tank access, connection type, unloading pump, compatible hoses, utilities, vapor-management arrangements and approved operating procedures.
For p-Xylene, the receiving site should also confirm its ability to manage the material’s phase condition throughout the tank, unloading connection, pipeline, valve and receiving vessel. A quotation to a port or destination does not by itself prove that the site can unload the cargo.
Incoterms and Logistics Responsibilities
FCA, CPT, CIP, FOB, CFR or CIF may be evaluated depending on the transport mode, carrier handover point, named place or port and operational arrangement.
FCA, CPT and CIP may be appropriate where packaged cargo or ISO tank containers are handed to a carrier before vessel loading. FOB, CFR and CIF should be used only where their maritime delivery structure matches the actual transaction.
Incoterms do not automatically determine tank ownership, leasing, cleaning, thermal-system operation, utilities, destination unloading, detention, demurrage or tank return. These responsibilities should be stated separately in the quotation or sales agreement.
Under CFR and CIF, destination import clearance, duties and taxes normally remain the buyer’s responsibility. Destination unloading costs and physical tank-discharge responsibilities depend on the carriage contract and any separate commercial agreement.
Storage, Handling and Safety
p-Xylene is a volatile and flammable aromatic material. Storage and handling should follow the current SDS, applicable regulations, approved equipment design and site-specific EHS procedures.
Ignition Control: Keep the material away from heat, sparks, flames and other ignition sources according to approved facility controls.
Static Electricity: Bonding, grounding and suitable transfer equipment may be required during loading, unloading and internal transfer.
Ventilation and Vapor Management: Suitable ventilation and closed-transfer arrangements should be evaluated according to the equipment and operation.
Compatible Equipment: Tanks, pumps, hoses, seals, gaskets, valves and fittings should be reviewed for chemical, thermal and operational compatibility.
Phase Condition: Solidification should not be treated as eliminating fire or vapor hazards. Liquid regions may remain, while warming or partial melting can change vapor-generation conditions.
Personal Protection: PPE requirements should be determined from the current SDS, exposure assessment and approved site procedure.
Spill and Emergency Planning: Facilities should maintain approved response arrangements and trained personnel appropriate to the quantity and operation.
Hazard statements, pictograms and transport details may vary according to the applicable regulatory framework, source and SDS revision. The current SDS provided for the proposed material should take precedence over generalized website summaries.
Documents Available for Technical Evaluation
Depending on the source and project, Aure Chemical may coordinate or provide available documents for preliminary technical and commercial evaluation, such as:
Standard product specification.
Representative or sample COA.
Batch COA for the identified shipment lot.
Current SDS.
TDS where available and applicable.
Packaging or tank information.
Tank data, insulation or thermal-system details where required and available.
Tank-cleaning and previous-cargo information where applicable.
Commercial invoice, packing list, transport document and certificate of origin where applicable.
A specification defines the controlled quality parameters and limits, while a COA reports analytical results. An SDS communicates hazard and safe-handling information and should not be treated as a batch-quality certificate.
Information Required for a p-Xylene RFQ
To evaluate technical, commercial and logistics feasibility, buyers should provide:
Exact product name and CAS number 106-42-3.
Required assay and complete impurity specification.
Intended use, such as PTA, terephthalic acid or DMT production.
Trial quantity, regular order quantity and estimated annual demand.
Required analytical methods or reporting basis where relevant.
Preferred packaging or bulk-tank arrangement.
Buyer-provided or supplier-arranged ISO tank requirement.
Tank data, insulation and installed thermal-system details where applicable.
Tank-cleaning and previous-cargo requirements.
Expected seasonal and temperature conditions.
Destination country, port or delivery point.
Required Incoterm and named place or port.
Receiving-site storage, temperature-management and unloading capability.
Required COA, SDS, TDS and shipping documents.
Sample, qualification or production-source approval requirements.
Source-change notification requirements.
Temperature-record or monitoring expectations where relevant.
Target shipment schedule.
Proposed payment method.
Importer and end-user information where required.
Buyers preparing a formal inquiry may use the xylene specifications and procurement checklist to align technical, quality, packaging, documentation and commercial requirements before requesting a quotation.
Evaluating p-Xylene Supply with Aure Chemical
Aure Chemical is a China-based chemical supplier, distributor and international sourcing partner. We work with qualified Chinese producers and supply-chain partners to evaluate p-Xylene requirements according to specification, quantity, intended use, production source, tank arrangement, temperature-management requirements, destination and current availability.
Aure Chemical may assist with product-identity confirmation, source evaluation, representative COA and specification review, SDS and TDS coordination, sample or qualification discussions, packaging and ISO tank-option review, export-document coordination and dangerous-goods logistics evaluation.
FCA, CPT, CIP, FOB, CFR or CIF arrangements may be discussed where operationally appropriate to the transport mode, carrier handover point and named destination. Tank availability, vessel space, route, thermal-management capability, carrier acceptance, destination unloading and final shipment timing remain subject to project-specific confirmation.
Final technical approval remains with the buyer. Available specifications, documents, samples, tanks and supply sources vary by project, and any manufacturer or production-site change should be reviewed against the buyer’s qualification requirements.
Frequently Asked Questions
Is p-Xylene the same as mixed xylenes?
No. p-Xylene is the single 1,4-dimethylbenzene isomer, CAS 106-42-3. Mixed xylenes contain varying proportions of o-Xylene, m-Xylene, p-Xylene and ethylbenzene. They should not be treated as interchangeable without process review.
What is the principal industrial use of p-Xylene?
Its principal use is as an upstream feedstock for terephthalic acid and PTA production. It is also connected with selected DMT routes and downstream PET resin, polyester fiber and film value chains.
Is p-Xylene directly esterified to produce DMT?
p-Xylene is first converted into terephthalic intermediates. In selected process routes, these intermediates are then converted into DMT. p-Xylene itself is not directly transformed into DMT through a single esterification step.
Is p-Xylene added directly to PET resin?
No. p-Xylene first enters the value chain through conversion to PTA or DMT. These intermediates are then used in polyester polymerization.
Is purity the only important p-Xylene specification?
No. Residual o-Xylene and m-Xylene, ethylbenzene, water, color, nonvolatile residue, process-sensitive traces, analytical methods, batch consistency and source control may also affect qualification.
Why does p-Xylene crystallize?
p-Xylene has a melting point of approximately 13.3°C. When the product temperature falls below its applicable melting range, crystals or solid material may form. This is generally a physical phase change rather than chemical degradation.
Does crystallized p-Xylene mean the material is off specification?
Not automatically. Crystallization alone does not prove degradation or contamination, but representative sampling and quality review may be needed after delays, seal damage, water ingress, abnormal heating or another unusual event.
Does every ISO tank have heating equipment?
No. ISO tanks differ in insulation, installed thermal systems, fittings and discharge arrangements. An insulated tank is not necessarily equipped with heating capability.
Can Aure Chemical provide a COA and SDS?
A representative COA, current SDS and other available documents may be coordinated for technical review. The batch COA for the actual shipment should be compared with the agreed specification.
Can p-Xylene be supplied in drums?
Drum packaging may be evaluated for smaller quantities where the source, package approval, route, carrier and destination requirements permit. Exact package availability should be confirmed before quotation.
Can p-Xylene be shipped in an ISO tank?
ISO tank transportation may be evaluated for bulk requirements. Tank design, insulation, installed thermal systems, cleanliness, previous cargo, route, seasonal conditions and receiving capability should be confirmed.
What information is required for a quotation?
Buyers should provide the specification, intended use, quantity, annual demand, packaging or tank preference, temperature-management requirements, destination, Incoterm, receiving capability, required documents, qualification requirements and shipment schedule.
Industrial buyers evaluating p-Xylene supply may submit the required specification, quantity, intended use, tank or packaging arrangement, temperature-management requirements, destination, Incoterm, qualification requirements and shipment schedule to Aure Chemical for a technical, commercial and logistics feasibility review.
