How to identify the differences between spun poly and poly filament

Do you ever get confused between poly filament and spun polyester? Check out this simple chart for a clearer understanding.

Fiber	Fiber length	The unit of yarn	Texture	Color appearance	Color fastness to wash
Spun polyester	short length	s	natural, less smooth	matt	good
Poly filament	long, continuous	D	smooth, shiny	bright	excellent
Fiber	Shrinkage to wash	Anti pilling	Abrasion Resistance	Durability	End uses
Spun polyester	good	weak	low	good	casual wear, T-shirts, soft furnishings
Poly filament	excellent	excellent	high	excellent	activewear, fashionable women's clothing

In summary, filament yarn is preferable for high color vibrancy, excellent dimensional stability, and durability, spun yarn offers a softer hand and a natural appearance, with good but slightly more moderate color fastness and shrinkage resistance.

Both types of yarns offer durability, but the choice between them depends largely on the desired texture, finish, and application in the final textile product.

I hope the chart above provides a clear and simple way to tell spun polyester and poly filament materials.