The identification methods of raw materials include combustion identification method, reagent display identification method, dyeing identification method, color developer identification method, black light irradiation fluorescent color identification method, display identification method.
Microscope surface feature observation and identification method, chemical dissolution identification method. Let's talk about the combustion identification method, which is the most widely used method, and the method is simple.
However, there are many types of natural fibers and rayon fibers, and their combustion performance, smell and ashes are basically similar, and it is not easy to distinguish them.
a method of identification.
Cotton, linen, viscose fiber, tencel fiber: close to the flame, non-shrinking and non-melting. When in contact with the flame, it burns rapidly and the flame is yellow. Leave the flame and continue to burn.
Smells like burnt paper. Observe that its ashes have a small amount of off-white or first gray ashes.
Polyester: Close to flame, shrink and melt. In contact with flame, it melts and burns. The flame is bright, smokeless, and yellowish-white. Leave the flame and keep burning. smell
It has a special aroma. Observe that its ashes are hard black balls that are not easily crushed.
Nylon: close to the flame, shrink and melt. Contact with flame, molten burning, burning with white smoke, no flame, leaving flame, burning slowly, sometimes spontaneously
line goes out. Smells slightly like celery. Observe its ashes, which can be shredded while still hot, and become hard brown balls when cooled, which are difficult to crush.
Polypropylene: Softens close to the flame. In contact with the flame, it melts and burns with a yellow flame. leave the flame. Melting stops immediately. Smells slightly bitumen.
Observe its ashes, no ashes, the remaining part of the burning is hard transparent beads or brown amorphous lumps.
Acrylic: close to the flame, soften and shrink. Contact the flame, burn quickly, leave the flame, continue to burn, black smoke comes out when burning. smell
Special spicy pungent taste. Watch for hard, brittle black balls or amorphous brown lumps of ash.
Wool silk: close to the flame, shrink and do not melt. When in contact with the flame, it burns. Leave the flame and continue to burn slowly, sometimes extinguishing itself. smell
Smells like burning hair and nails. Observe its ashes for loose and crisp dark brown ashes that shatter when pressed with a finger. Silk fiber: close to the flame, non-shrinking and non-melting. When in contact with the flame, it burns rapidly and the flame is yellow. Leave the flame and continue to burn.
Smells like burnt paper. Observe that its ashes have a small amount of off-white or first gray ashes.
