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Quick Details

  • CAS No.: 98-73-7
  • Other Names: PTBBA
  • MF: C11H14O2
  • EINECS No.: 202-696-3
  • Place of Origin: Zhejiang, China (Mainland)
  • Grade Standard: Industrial Grade
  • Purity: ≥99%
  • Appearance: Colorless needle crystalls or crystal powder
  • Application: Synthetic intermediate
  • Brand Name: Orchid
  • Model Number: First grade
  • CAS: 98-73-7

Packaging & Delivery

Packaging Details 25KG/bag
Delivery Time in 7 days

Para-tert-Butylbenzoic acid    CAS# 98-73-7

Assay: 99.0% Min

Molecular Formula  C11H14O2
Molecular Weight     178.23

EINECS NO.:  202-696-3







White crystals



99% Min.


acid value



Melting point




0.2% Max.



0.1% Max.




Safety information

dangerous markXn,N,T
Risk category code20/22-62-51/53-48/20/21/22-24
UNUN 2811 6.1/PG 3
WGK Germany 3
Packing Group III



PTBBA is mainly used in the EU for the manufacture of thermal stabilisers in PVC. For this purpose, PTBBA is first converted into its metal salts (Metal-p-tert-butylbenzoate, Me-PTBB). According to ESPA (European Stabiliser Producers Association) six plants are using PTBBA for the production of liquid mixed metal stabilisers. The next two life-cycles stages (compounding and conversion) occur generally at one site. The mixed metal stabilisers are used entirely in the processing of plasticised PVC. ESPA indicates that liquid metal stabilisers are used in both major compounding methods and their subsequent conversion methods. Dry blending followed by calendering is the major use of these stabilisers. The second most important use of PTBBA in the EU is the use as process regulator (chain stop agent) in polymers industry for producing alkyd and polyester resins. PTBBA is added into the polymerisation step of resin production where it reacts covalently with the usual alkyd monomers. According to industry, PTBBA is added into the mixture of precursors in a share of 1-10 % w/w, but unreacted PTBBA is present only in very low concentrations (< 0.1 % w/w). It is therefore assumed that the downstream uses of resins are not relevant for the environmental risk assessment.



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