Identification method of filter cloth fiber raw material — combustion method

There are many methods for identifying fibers, including combustion method, microscope observation method, density measurement method, dyeing method, reagent coloring method and dissolution method. With only one method, it is generally not possible to immediately determine the type of fiber, and a comprehensive analysis must be performed based on the test results of several methods. For the initial identification, you can first use the less time-consuming combustion method or microscope observation method. When this method cannot meet the requirements, other methods are used to supplement the identification.

Combustion characteristics of various fibers:

Fiber name Burning state Smell Ash state
Cotton, viscose, linen, cuprammonium fiber Fast burning, automatic spread, the burnt part is dark brown Smell of burning paper Off-white powder
Silk, wool Curling and burning, foaming and burning at the same time Smell of burning hair Crunchy black lumps or round beads
Acetate fiber Melt and shrink near the flame, touch the flame and burn, leave the flame and continue to burn Smell of acetic acid Loose and crisp black ash, unburnt part is black
Nylon fiber The flame melts and shrinks near the flame, and the flame burns and melts slowly when contacting the flame. Smell of ammoniate Like a transparent glass ball, stretched linearly before cooling
Polyester fiber Near flame melting and shrinking, burning slowly when contacting flame, leaving flame to continue burning Aroma Hard black round beads
Acrylic fiber Near flame melting and shrinking, contact with flame melting and burning black smoke Off-odor Unshaped black hard block
Vinylon fiber Close to the flame, it shrinks on one side and burns on the other, with black smoke Smell of special sweetness Irregularly shaped black ashes
Polyvinyl chloride fiber Close to the flame to melt and contract, contact with the flame to burn, leave the flame to extinguish by itself Off-odor Crisp black ashes
Polypropylene fiber Burning while melting near the flame Slight bitumen odor Hard yellowish brown balls

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