Understanding Fiber Properties

Fibers have distinct characteristics crucial for textile applications. These are broadly classified into primary and secondary properties.

• Primary Properties: These are fundamental, inherent characteristics of a single fiber. Examples include length, fineness (diameter), tensile strength, and elongation.
• Secondary Properties: These properties often relate to how fibers behave collectively, during processing, or influence the final fabric. Examples include density, cohesiveness, crimp, resilience, and moisture absorption.

Identifying the Secondary Property

Let's analyze the given options in the context of fiber properties:

• Uniformity: Refers to the consistency of primary properties (like length and fineness) within a batch of fibers. It's often linked closely to primary characteristics.
• Density: This is the mass per unit volume. While a physical measurement, it is considered a secondary property as it affects the fabric's weight, bulk, and drape.
• Cohesiveness: This describes the ability of fibers to cling together, which is essential for yarn formation (spinning). It's a behavioral property, hence secondary.
• Tensile strength: This measures the force a fiber can withstand before breaking. It is a core, inherent characteristic and thus a primary property.

Based on standard classifications, both Density and Cohesiveness are secondary properties. However, Density is listed as Option B and is the correct answer provided.

Conclusion

Among the choices provided, Density is classified as a secondary property of fibers, influencing the overall characteristics of textile materials derived from them.