Trimethylbenzene
High-boiling symmetrical aromatic feedstock for high-temperature coatings, polyimide monomers and electronics cleaning.
Product photo plus packaging, storage and loading conditions at our Dongguan facility.
At a Glance
| CAS No. | 108-67-8 |
| Chemical Name | 1,3,5-Trimethylbenzene (mesitylene) |
| Molecular Formula | / |
| Purity | On request |
| Origin | China |
| Packaging | 210 L steel drum (175 kg) / IBC / ISO tank / small drum |
| Lead Time | 60 working days after deposit |
Product Overview
Mesitylene (1,3,5-trimethylbenzene) is refined from C9 heavy aromatics by freeze crystallisation and multi-stage vacuum fractionation, which isolates the target isomer and keeps xylene and other heavy aromatic impurities tightly controlled. It is supplied both as a general industrial grade and as a low-metal electronic high-purity grade. The symmetrical trimethyl structure gives a high boiling point and slow evaporation, so the solvent resists flash-off in high-temperature baking, while the evenly spaced methyl groups deliver high selectivity in oxidation — the core building block for trimesic acid and polyimide film.
Demand from new-energy electronics and high-end specialty resins continues to expand, while industrial high-temperature coatings and fine dyes provide steady baseline volume. Tightening low-VOC regulation is moving formulators away from short-lived benzene-type solvents towards high-boiling aromatics, and spent material can be recovered by distillation to keep the long-term cost of use under control. The product must be stored and shipped fully sealed, segregated from strong oxidisers, in an explosion-proof ventilated warehouse.
Key Advantages
Ultra-High Boiling Point, Slow Evaporation for High-Temperature Stoving
The slow, even evaporation rate stops the solvent flashing off in stoving ovens, so the film levels out fully with no pinholing or blistering — ideal for long bake cycles.
Symmetrical Structure, High Reaction Selectivity
The symmetric molecule oxidises cleanly to trimesic acid for polyimide film, heat-resistant films and electronic encapsulation resins — a core feedstock for high-end materials.
Broad Resin Solubility for High-Temperature Inks and Paint Removers
Outstanding solvency for epoxy, polyester and high-temperature resins, with proven performance in stoving screen-printing inks and heavy-duty industrial paint removers.
Lower Volatility, Less Workshop Irritation than Light Aromatics
Low vapour pressure keeps airborne concentrations in the workshop lower and reduces the load on abatement equipment, helping you meet VOC limits in your market.
Applications
Mesitylene serves six distinct industrial segments: high-temperature industrial stoving coatings, polyimide monomer synthesis, electronics lithography cleaning, dye intermediates, agrochemical additives and chromatographic reference standards.
- High-temperature industrial stoving coatings — automotive coil coatings, heat-resistant stoving finishes for hardware and dilution carriers for powder coatings, giving a complete film with durable gloss.
- High-end polymer synthesis — oxidation to trimesic acid for polyimide film and heat-resistant electronic encapsulation resins.
- Semiconductor and electronics cleaning — PCB photoresist dilution and wafer residue stripping, with low impurity levels and no corrosion of precision components.
- Organic dye intermediates — the chromophore backbone for high-end acid and disperse dyes, giving a marked improvement in colour fastness.
Technical Specifications
| Appearance | Colourless transparent liquid with an aromatic odour |
| Purity | On request |
| Molecular Formula | / |
| CAS No. | 108-67-8 |
| EINECS No. | 203-604-4 |
| Relative Density (water = 1) | 0.86 |
| Flash Point | 44 °C |
| Boiling Point | 164.7 °C |
| Hazard Classification | Class 3 flammable liquid |
| Stability | Stable at ambient temperature when sealed; never store or handle in contact with strong oxidisers such as nitric acid or potassium permanganate |
| Solubility | Insoluble in water; miscible with ethanol, ether, benzene and most organic solvents |
| Storage | Cool, explosion-proof hazardous goods warehouse at 37 °C or below, with containers kept fully sealed and protected from light. Store separately from oxidisers and strong acids and keep sand and foam firefighting materials on hand. |
Composition
| Component | Concentration | CAS No. |
|---|---|---|
| Trimethylbenzene | / | 108-67-8 |
Transport & Compliance
| UN No. | UN2325 |
| Hazard Class | Class 3 flammable liquid |
| Packing Group | III |
| HS Code | / |
| Packaging | 175 kg per drum (210 L steel drum) |
UN and HS codes are shown for reference only — please confirm with us before shipment.
FAQ
What is your minimum order quantity?
Our MOQ is one 20GP container — up to 80 drums of 210 L.
What packaging do you offer?
Standard 210 L steel drums, plus IBC totes, ISO tank containers and small drums.
How many drums fit in a 20GP or 40GP, and can you consolidate?
Yes, we consolidate up to 5 product types in one shipment. A 20GP holds up to 80 drums (210 L); a 40GP holds around 130 drums (210 L).
What is the lead time?
About 60 working days after the deposit is received.
Which export documents do you provide?
COA, MSDS, commodity inspection certificate and dangerous goods packaging certificate. We can also assist with Certificate of Origin and other customs paperwork.
What payment terms do you accept?
T/T: 30% deposit, 70% balance against a copy of the Bill of Lading.
Technical Documents
MSDS and batch COA for Trimethylbenzene are available on request. Tell us your quantity and destination port and we will send the documents with your quotation. Request documents →
Request a Quote for Trimethylbenzene
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