Identification of polyester


Polyester is a synthetic fiber that is widely used in the textile industry. It is durable, lightweight, and easy to care for, making it a popular choice for clothing, upholstery, and other applications. The identification of polyester is important for textile industry, as it helps in distinguishing this fiber from other natural and synthetic fibers.

In this lab, we will learn how to identify polyester using simple tests and microscopy. We will also learn how to differentiate between different types of polyester.


  • Polyester sample
  • Burner
  • Beaker
  • Water
  • Tweezers
  • Glass slides
  • Cover slips
  • Microscope


  1. Visual Inspection:

The first step in identifying polyester is to visually inspect the sample. Look at the fiber and observe the texture, color, and sheen. Polyester fibers are smooth to the touch and have a shiny, lustrous appearance. They may have a wide range of colors, including white, black, and vibrant colors.

  1. Burn Test:

The next step is to perform a burn test to distinguish polyester from other fibers. Take a small sample of the fiber and burn it with a lighter. Observe the flame, smoke, and ash produced.

  • Polyester: When polyester is burned, it produces a bright flame that quickly extinguishes itself. It also produces a sweet, chemical smell and leaves behind a hard, bead-like ash.
  1. Microscopic Examination:

The final step is to examine the fiber under a microscope to confirm the identification. Take a small sample of the fiber and place it on a glass slide. Add a drop of water to the sample and cover it with a cover slip. Examine the fiber under a microscope.

  • Polyester: Polyester fibers have a smooth, circular or oblong-shaped section. They have no distinct markings and are uniform in texture and color.


In this lab, we learned how to identify polyester using simple tests and microscopy. Polyester fibers can be distinguished from other fibers by their visual appearance, burn test, and microscopic characteristics. This knowledge is important for textile industry and for ensuring the quality of products made from polyester fibers.