p-Phenylenediamine (PPD), CAS 106-50-3, is an aromatic diamine used in dye production and para-aramid manufacture. Assay, isomer impurities, moisture and oxidation-related color help define the grade required for a process.
p-Phenylenediamine (PPD) CAS 106-50-3
- CAS: 106-50-3
- Synonyms: p-Phenylenediamine; PPD; 1,4-Phenylenediamine; 1,4-Benzenediamine; Ursol D
- Einecs: 203-404-7
- Molecular Formula: C₆H₈N₂
- Grade: Assay, isomer impurities and color specified by grade
- Package: Sealed packaging with protection from air and light; packing quoted per order
Product Description
In para-aramid production, PPD reacts with terephthaloyl chloride to form poly(p-phenylene terephthalamide). Some solution-polymerization processes use N-methyl-2-pyrrolidone (NMP) with anhydrous calcium chloride. The solvent and salt grades must suit the selected process; calcium chloride dihydrate is not equivalent to the anhydrous material.
PPD is also an oxidation-dye precursor, with resorcinol used as a coupling component in suitable formulations. Grade suitability for hair-dye formulations depends on the applicable specification and target-market requirements.
Aniline is an upstream feedstock in established multistep PPD manufacturing routes. It is a monoamine, whereas PPD is a para-diamine; the two are different raw materials and are not interchangeable as the diamine monomer.
Quality specifications can include assay, isomer and other organic impurities, water, color and melting range. GC and HPLC provide chromatographic purity or impurity information under the applicable method. A chromatographic area percentage is not automatically a mass percentage. Nonaqueous or potentiometric titration reports assay on its stated basis and does not by itself resolve individual isomer impurities. Air oxidation can darken PPD, so color alone does not establish purity.
We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS), together with relevant GC or HPLC chromatograms and assay-method information for the selected grade. Batch results belong to the corresponding batch COA.
For a quotation, send the required grade or application, quantity and destination; include critical impurity or color limits where relevant. Sealed packing and delivery details are quoted for the order. Protect the material from air and light, following the storage and handling conditions in the applicable SDS.
FAQ - Technical & Supply Chain
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Q:
Are p-phenylenediamine, 1,4-benzenediamine and PPD the same substance?
A: These names refer to the free-base para isomer, CAS 106-50-3. The ortho and meta isomers, as well as PPD salts, are different materials. Use the full name and CAS on the enquiry and purchase order. -
Q:
Which quality specifications matter when buying PPD?
A: Select the assay, isomer and other impurity limits, water and color requirements for the intended process. State the test method and reporting basis: GC or HPLC area percentages are not automatically mass content, and a titration result alone does not identify individual isomer impurities. The COA and relevant chromatograms support comparison against the agreed grade. -
Q:
How can PPD oxidation be limited during storage and receipt?
A: Keep packaging sealed and protect the material from air and light according to the applicable SDS. Inspect package seals on receipt and minimize exposure during sampling. Color may change through oxidation and should be assessed alongside the agreed specification and analytical results.
Ordering & Documentation
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Storage & Shipping
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