Question

The diameter (in micron) of fine or apparel wool fibre is

• A. less than 25
• B. 25‐32
• C. 33‐35
• D. 36‐38

Hint:

Apparel wool must be fine (less than 25 microns) to prevent the "prickle" sensation on human skin, ensuring the garment is comfortable to wear.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Wool fibers are classified into different commercial grades based on their average fiber diameter, measured in microns.
Finer fibers are softer and more flexible, making them suitable for high-quality apparel clothing.

Step 2: Detailed Explanation:
The wool industry classifies wool into four main categories based on fiber diameter:
Fine (Apparel) Wool: This grade has an average fiber diameter of less than 25 microns (often ranging from 18 to 22 microns, primarily sourced from Merino sheep). It is used to manufacture soft, high-quality clothing.
Medium Wool: This grade has an average fiber diameter of 25 to 31 microns, used for sweaters, blankets, and upholstery.
Coarse Wool: This grade has an average fiber diameter of 32 to 36 microns.
Very Coarse (Carpet) Wool: This grade has an average fiber diameter of more than 36 microns, used for industrial carpets and rugs.
Thus, fine or apparel wool is defined by a fiber diameter of less than 25 microns.

Step 3: Final Answer:
The average fiber diameter of fine or apparel-grade wool is less than 25 microns.