Polybutylene terephthalate

Polyester melting temperature


Lead Blog Post ImageShould you be using a polypropylene or polyester sewing thread? We compare these two different materials to help you decide.

Polypropylene - Advantages:

  • Lower specific gravity/density (0.91 g/cm³) – More fibers/unit weight (~25% more).
  • More hydrophobic – absorbs less water and therefore dries faster.
  • Lower heat transfer – Retains more heat.
  • Inert to most chemicals.

Polypropylene – Disadvantages:

  • Lower Melting Point 165 degrees C.
  • Lower UV resistance – needs additives like Carbon Black to prevent rapid deterioration with UV exposure.
  • Lower Strength – requires larger thread or yarn to meet strength targets.
  • Lower creep resistance and higher elongation.
  • Poor abrasion resistance.
  • Not suitable for high speed sewing applications.

Polyester Advantages:

  • Higher strength, tenacity and creep resistance – distinct advantage in Geotextiles and especially when load is on a fabric.
  • Greater yield per pound.
  • Higher melting point (260°C vs 165°C).
  • Withstands high temperature washing and drying.
  • More UV resistant - Retains strength and color better.
  • Resistant to most chemicals.
  • Has good flame resistance and flame retardant properties.
  • Has good abrasion resistance.
  • Polyester is used more for sewing – Higher strength and can withstand high temperatures generated during the sewing process (up to 350°C).
  • Polyester produces a better all-around fabric and sewing thread.

Polyester Disadvantages:

  • Higher specific gravity.
  • Less hydrophobic, requires additives or coating to prevent wicking.
  • Susceptible to damage if exposed to highly alkaline chemicals.



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