4-tert-Butylbenzoic acid
CAS 98-73-7
EC 202-696-3
Formula C11H14O2
MW 178.23 g/mol
Organic Acids Plastics & PolymersPersonal Care & CosmeticsCoatings, Adhesives, Sealants & Elastomers UV Protection & StabilizationAntioxidant & StabilizerCatalysis
Description
4-tert-Butylbenzoic acid (CAS 98-73-7, EC 202-696-3) is an aromatic carboxylic acid commercially available under designations including RARECHEM AL BO 0693, p-tert-Butylbenzoic acid, and 4-t-Butylbenzoic acid. It carries no assigned E-code and is classified under HS code 29163900.
In alkyd resin and polyester formulations, it functions as a chain-stopper that controls molecular weight and improves colour stability by capping reactive end groups. In polymer stabilisation systems, it acts as a co-stabiliser alongside heat stabilisers to retard oxidative degradation in PVC and polyolefin compounds. Personal care formulators incorporate it as a skin-conditioning agent and UV-absorber in leave-on products.
The material is supplied as a solid and is available in standard industrial grades compliant with REACH registration requirements. Procurement teams should confirm supplier documentation including SDS, CoA, and REACH SVHC declarations prior to sourcing. Packaging formats typically range from multi-layer bags to fibreboard drums depending on order volume.
In alkyd resin and polyester formulations, it functions as a chain-stopper that controls molecular weight and improves colour stability by capping reactive end groups. In polymer stabilisation systems, it acts as a co-stabiliser alongside heat stabilisers to retard oxidative degradation in PVC and polyolefin compounds. Personal care formulators incorporate it as a skin-conditioning agent and UV-absorber in leave-on products.
The material is supplied as a solid and is available in standard industrial grades compliant with REACH registration requirements. Procurement teams should confirm supplier documentation including SDS, CoA, and REACH SVHC declarations prior to sourcing. Packaging formats typically range from multi-layer bags to fibreboard drums depending on order volume.
Physical Properties
| Melting Point | 164.5-165.5 °C |
| Boiling Point | 222-224 °C |
| Density | 1.045 g/cm 3 (30°C) |
| Flash Point | 180 °C |
| Appearance | WHITE TO YELLOW FLAKES |
| Color | White to Off-White |
| Form | Solid |
| Water Solubility | 0.07 g/L (20 ºC) |
| Vapor Pressure | <0.01 hPa (20 °C) |
| Refractive Index | 1.5201 (estimate) |
| pH | 3.9 (H2O, 20℃)(saturated solution) |
| Log P | 3.4 at 21℃ |
Safety & Handling (Learn More)
Danger GHS07 GHS08 GHS09
H
H302H320H360H361H370H372H373H401H411
P
P203P260P264P270P273P280P318P319P321P330P391P405P501P264+P265P301+P317P308+P316P337+P317P305+P351+P338
Trade & Regulatory
| HS Code | 29163900 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| WGK (Germany) | 3 |
Other Names
Para-tert-Butylbenzoic Acidp-tert-Butylbenzoic acidPTBBA4-tbbaRARECHEM AL BO 0693P-T-BUTYLBENZOIC ACID4-t-Butylbenzoic acid
Related Products
Raw Materials
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