p-Xylene
CAS Number 106-42-3
Chemical Formula C8H10
Synonyms:
1,4-Xylene
4-Methyltoluene
p-Dimethylbenzene
Appearance Colorless liquid
HS Code 29024300
MOQ (Minimum Order Quantity) 1 FCL (Full Container Load)
Paraxylene is a key organic chemical feedstock, primarily used to manufacture terephthalic acid (PTA), dimethyl terephthalate (DMT), and polyethylene terephthalate (PET), which are further processed into polyester materials. It also serves as a solvent and raw material for pharmaceuticals, fragrances, inks, and related industries. Today, China ranks as the world’s top producer and consumer of paraxylene. Historically, paraxylene was recovered from petroleum aromatics produced by naphtha catalytic reforming. With advances in petrochemical and coking industries, aromatics conversion has become the most efficient route for paraxylene production. Industrially, paraxylene is typically synthesized from toluene and C9 aromatics using technologies such as toluene disproportionation, transalkylation, xylene isomerization, toluene-methanol alkylation, and adsorption separation.
Parameters
| Item | Value |
| Melting point | 12-13 °C (lit.) |
| Boiling point | 138 °C (lit.) |
| density | 0.861 g/mL at 20 °C (lit.) |
| vapor density | 3.7 (vs air) |
| vapor pressure | 9 mm Hg ( 20 °C) |
| refractive index | n 20/D 1.495(lit.) |
| Fp | 77 °F |
| storage temp. | Store at +5°C to +30°C. |
| solubility | water: soluble0.2g/L |
| form | Liquid |
| pka | >15 (Christensen et al., 1975) |
| color | Colorless |
| Relative polarity | 0.074 |
| Odor | Like benzene; characteristic aromatic. |
| Odor Threshold | 0.058ppm |
| explosive limit | 1.1-7%(V) |
| Water Solubility | Miscible with alcohol, ether, acetone, benzene and chloroform. Immiscible with water. |
| λmax | λ: 294 nm Amax: 1.00; λ: 320 nm Amax: 0.10; λ: 350 nm Amax: 0.05; λ: 380-400 nm Amax: 0.01 |
| Merck | 14,10081 |
| BRN | 1901563 |
| Henry’s Law Constant | 16.1 at 45.00 °C, 18.6 at 50.00 °C, 20.3 at 55.00 °C, 23.4 at 60.00 °C, 30.5 at 70.00 °C (static headspace-GC, Park et al., 2004) |
| Exposure limits | TLV-TWA100 ppm (～434 mg/m³) (ACGIH, MSHA, and OSHA); STEL 150 ppm (～651 mg/m³) (ACGIH); ceiling 200 ppm/ 10 min (NIOSH); IDLH 1000 ppm (NIOSH). |
| Dielectric constant | 2.6（20℃） |
| Stability: | Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable. |
| InChIKey | URLKBWYHVLBVBO-UHFFFAOYSA-N |
| LogP | 3.16 at 20℃ |
| Surface tension | 28.11mN/m at 298.15K |
| CAS DataBase Reference | 106-42-3(CAS DataBase Reference) |
| EPA Substance Registry System | p-Xylene (106-42-3) |
Safety Information
| Item | Value |
| Hazard Codes | Xn,T,F |
| Risk Statements | 10-20/21-38-39/23/24/25-23/24/25-11 |
| Safety Statements | 25-45-36/37-16-7 |
| RIDADR | UN 1307 3/PG 3 |
| OEB | A |
| OEL | TWA: 100 ppm (435 mg/m3), STEL: 150 ppm (655 mg/m3) |
| WGK Germany | 2 |
| RTECS | ZE2625000 |
| Autoignition Temperature | 984 °F |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | III |
| HS Code | 29024300 |
| Hazardous Substances Data | 106-42-3(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 3910 mg/kg |
Product Application of p-Xylene CAS#106-42-3
Solvents for rubber, paint and additives for aviation fuel
Fast delivery time
Inventory 2-3 working days New production 7-10 working days
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