Fibre Properties: Key Characteristics Explained

This question asks to identify which option is not a primary property of a fibre. Let's analyze the given options:

Primary Fibre Properties

• Strength: This refers to a fibre's ability to withstand stress or tension without breaking. High strength is crucial for durability in textiles.
• Flexibility: This is the fibre's ability to bend repeatedly without breaking. Flexibility affects the drape and comfort of the final fabric.
• Cohesiveness: This is the ability of fibres to cling or stick to each other. Cohesiveness is essential for spinning fibres into yarn.

Non-Primary Fibre Property

• Density: While density (mass per unit volume) is a physical property of the material composing the fibre, it is not considered a primary *functional* property in the same category as strength, flexibility, or cohesiveness. These latter properties directly influence how a fibre behaves during processing (like spinning) and in its end-use application (like fabric performance). Density is a characteristic, but not a defining performance property like the others.

Therefore, density is the property that is not typically classified as a primary characteristic defining the essential nature and application potential of a fibre compared to strength, flexibility, and cohesiveness.