Pilot® PTSA-65 is toluene sulfonic acid with a high para-isomer content. It serves in various specialty applications as a catalyst and chemical intermediate.

Chemical Name: Toluene-4-sulphonic acid

CAS Number: 104-15-4

Chemical Family: Organic Acids, Sulfonic Acids & Derivatives

Reaction Type: Alkylation

Synonyms: 1-Methyl-4-(sulfosulfonyl)benzene, 4-Methyl-benzensulfonic acid, 4-Methylbenzene-1-sulfonic acid, 4-Methylbenzenesulfonic acid, 4-Toluenesulfonic acid, Methylbenzenesulfonic acid, p-Methylbenzenesulfonic acid, p-Methylphenylsulfonic acid, p-Toluenesulfonic acid, p-Tolylsulfonic acid, p-Tsoh, Toluenesulfonic acid, Tosic acid, TsOH

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    Enhanced TDS

    Identification & Functionality

    Reaction Type
    Base Chemicals Functions
    Industrial Additives Functions

    Features & Benefits

    Product Benefits

    Pilot ® PTSA-65 is manufactured in a glass lined reactor to ensure a minimum of metallic impurities.

    Applications & Uses

    Applicable Processes
    Industrial Additives End Use
    Product Applications

    Pilot ® PTSA-65 can be used in various industrial specialty applications. These include applications in foundry processes, as a catalyst for alkylation, production of glacial acrylic acid, thermosetting resins and as a substitute for methane sulfonic acid catalysts. Pilot ® PTSA-65 is a specialty product that can be used in various chemical applications for the textile industry.


    Physical Form
    Clear amber liquid (at 25°C)
    Typical Properties
    ValueUnitsTest Method / Conditions
    Active Content65.0wt %-
    Colormax. 300APHA-
    Freeze Point-14.4°C -
    Iron contentmax. 20ppm-
    Neutralization Equivalent3.85 - 4.10meq/g-
    Sulfone Contentmax. 1.0wt %-
    Sulfuric Acidmax. 1.0wt %-
    Toluene Contentmax. 0.40wt %-

    Regulatory & Compliance

    Packaging & Availability

    Packaging Type
    Packaging Information

    Pilot ® PTSA-65 is available in 500 lb. poly drums and bulk quantities.

    Storage & Handling

    Shelf Life
    2 years
    Storage and Handling Information

    Keep containers closed when not in use. Diluted p-toluene sulfonic acid is very corrosive to steel. Store in glass or plastic containers Do not store with strong oxidizing agents. Avoid contact with eyes, skin, and clothing. Wear appropriate personal protective equipment and observe good industrial hygiene practices. Pilot ® PTSA-65 is a corrosive strong acid. Use acid resistant equipment when handling this material.