Fiber Burn Test Procedures and Indicators

The video tutorial demonstrates how to perform a burn test on fibers to identify their type. It covers the preparation of the candle, testing of natural and synthetic fibers, and observing characteristics such as flame behavior, smoke, smell, and residue. The results help distinguish between natural and synthetic fibers, with examples showing how to identify nylon.

What is the first step in preparing for a fiber burn test?

• Cutting the fibers into small pieces

• Lighting the candle and letting it burn down

• Twisting the fibers together

• Checking the color of the fibers

Why is it important to twist the fibers together before testing?

• To make them easier to hold

• To change the color of the fibers

• To make them burn faster

• To ensure the result is from the fibers burning, not trapped air

What indicates that a fiber is natural during the burn test?

• The fiber shrinks away from the flame

• The fiber does not shrink back from the flame

• The fiber produces a hard plastic blob

• The fiber changes color before burning

Which characteristic is NOT observed when burning natural fibers?

• The color of the flame

• The sound it makes

• The speed of burning

• The smell of the smoke

How can you tell if a fiber continues to burn after being removed from the flame?

• It produces a lot of smoke

• It self-extinguishes

• It continues to burn

• It has an afterglow

What should you do to safely smell the smoke from burning fibers?

• Smell the fibers before burning

• Use a fan to blow the smoke

• Waft the smoke towards your nose

• Inhale directly from the source

What is the significance of the afterglow in a burn test?

• It indicates the fiber is synthetic

• It shows the fiber is natural

• It helps identify the fiber type

• It is irrelevant to the test

What is a key indicator of synthetic fibers during the burn test?

• They have a sweet smell

• They shrink away from the heat

• They burn with a blue flame

• They produce a soft ash

What type of residue is left by synthetic fibers like nylon?

• Soft ash

• Hard plastic blob

• No residue

• Powdery ash

What is the purpose of comparing burn test results with known fibers?

• To determine the color of the fibers

• To check the strength of the fibers

• To identify the unknown fiber type

• To see how fast the fibers burn