June 11, 2019

Polypropylene yarn

Polypropylene (PP):

Polypropylene is a synthetic fiber which is made of petroleum’ derivatives. Polypropylene is a thermoplastic polymer and suitable spinning process for this polymer is melt spinning. The amount of crystalline and amorphous regions depend on the amount and the way of drawing during melt spinning, because in drawing molecular chains become parallel and they would be oriented by this process.

You can see numbers of polypropylene’s properties in the following table.

Tensile strength(g/den) 3.5-5.5
Elongation %40 to 100
Abrasion resistancegood
Moisture absorption %0-0.05
Tg (c°)140
Melting point (c°)165
Resistance to chemical excellent
Density (g/cm3)0.91
Resistance to mildew, mothgood
Resistance to acid Excellent (except chlorosulphonic and concentrated sulfuric acid)
Resistance to alkaliExcellent (except some oxidizing agents)
UV protectionWeak
Protection ability against insects good
dyingCannot be dyed easily ( by pigment)
Resistance to bleaching and solventsExcellent resistance
weightLighter than water
Dimensional Stabilitygood
Crystalline region %30-60
Resistant to Staininggood


Polypropylene fibers are used in non-woven fabric, diapers or sanitary products. Additionally we can use PP in Gas filtration, liquid filtration, air filtration, and house usage like air-conditioning-type and water filters, hospital masks, construction and too many other usages.

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