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    Related: Humectant Solvent 1,5-Pentanediol Butylene Glycol
    • 1,3-Propanediol CAS 504-63-2

    1,3-Propanediol CAS 504-63-2

    1,3-Propanediol (PDO, Trimethylene glycol), CAS 504-63-2, is a colorless water-miscible diol supplied for polymer, industrial and personal-care applications. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 504-63-2
    • Synonyms: Trimethylene glycol, 1,3-Dihydroxypropane, Propane-1,3-diol, PDO, 1,3-Propylene glycol
    • Einecs: 207-997-3
    • Molecular Formula: C₃H₈O₂
    • Grade: Industrial / cosmetic grade, purity typically ≥99.8% (GC)
    • Package: 25 kg plastic drum, 200 kg steel/plastic drum or IBC tote; other packaging can be arranged according to customer requirements
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    Product Description

    1,3-Propanediol, CAS 504-63-2, also known as trimethylene glycol or PDO, is a colorless, water-miscible diol with two primary hydroxyl groups; the EC/EINECS number is 207-997-3.

    Synonyms: Trimethylene glycol; 1,3-Dihydroxypropane; Propane-1,3-diol; PDO; 1,3-Propylene glycol.

    CAS: 504-63-2.

    Molecular formula: C₃H₈O₂.

    Molecular weight: 76.09.

    EC number: 207-997-3.

    It is a colorless, clear, viscous liquid with a density of about 1.053 g/mL at 25 °C, a melting point of about −27 °C and a boiling point of about 214 °C at 760 mmHg.

    The flash point (closed cup) is above 110 °C, the refractive index (n20/D) is about 1.440 and the vapor pressure is about 0.8 mmHg at 20 °C.

    It is completely miscible with water; a 100 g/L aqueous solution at 20 °C has a pH of about 4.5–7.0.

    It is used as a monomer for polytrimethylene terephthalate (PTT) and other polyesters, polyurethanes and copolyesters for fibers, films and engineering plastics.

    It is used as a solvent or co-solvent in waterborne coatings, inks and adhesives, and in heat-transfer, de-icing and antifreeze formulations as an alternative to ethylene or propylene glycol.

    It is used as a humectant and moisturizing agent in skin-care, hair-care and toiletry products, and as a solvent and viscosity modifier in liquid detergents and cleaners.

    Confirm GC assay, water content, color, acidity, residual carbonyl, chloride and iron content; industrial and cosmetic grades are available, typically at 99.8% or higher purity.

    Store in tightly closed drums or IBCs in a cool, dry, well-ventilated area below 30 °C, away from direct sunlight, strong oxidizers, acids and alkalis; use standard liquid-chemical handling and suitable PPE.

    Confirm the current product-specific specification.

    Confirm packaging with the requested quantity and destination requirements.

    Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required specification, quantity, packaging, destination and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      How does 1,3-Propanediol CAS 504-63-2 differ from Propylene Glycol?

      A: 1,3-Propanediol, also called Trimethylene glycol, is a linear diol with two primary hydroxyl groups separated by three carbon atoms. Propylene Glycol, CAS 57-55-6, is 1,2-Propanediol and has different metabolic, solvent and polymer properties.
    • Q:

      What are the main applications of 1,3-Propanediol CAS 504-63-2?

      A: It is used in the production of PTT polyester, polyurethanes, cosmetic humectants, industrial fluids, coatings and other specialty polymers. Its low irritation and good solvency also make it suitable for personal-care and pharmaceutical formulations.
    • Q:

      Is 1,3-Propanediol suitable for PTT polyester and polyurethane synthesis?

      A: Yes. 1,3-Propanediol is a key monomer for condensation polymerization, especially for polytrimethylene terephthalate and related copolyesters. Confirm monomer purity, water content and color before polymerization.
    • Q:

      What quality specifications should be checked for 1,3-Propanediol CAS 504-63-2?

      A: Confirm GC assay, water content, color, acidity, residual carbonyl, chloride and iron content. Specify industrial or cosmetic grade depending on the end use, and compare the offered batch analysis and technical data against the application requirements.
    • Q:

      How should 1,3-Propanediol CAS 504-63-2 be stored and handled?

      A: Store in tightly closed containers in a cool, dry, well-ventilated area, away from strong oxidizers and open flames. Use normal liquid-chemical handling controls and PPE, and follow the safety information for spill, disposal and first-aid procedures.

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