Question

The percentage of Moisture Regain of Silk is

• A. \(6.2\)
• B. \(7.5\)
• C. \(4.25\)
• D. \(11\)

Hint:

Remember the standard moisture regain values of commonly used fibres: \[ \begin{aligned} \text{Silk} &\approx 11\% \text{Cotton} &\approx 8.5\% \text{Wool} &\approx 14\text{--}16\% \text{Nylon} &\approx 4\% \text{Polyester} &\approx 0.4\% \end{aligned} \] Protein fibres such as wool and silk generally have higher moisture regain than synthetic fibres, making them more comfortable to wear in humid conditions.

Answer 1

The Correct Option is D

Concept: Moisture Regain is one of the most important physical properties of textile fibres. It indicates the ability of a fibre to absorb moisture from the surrounding atmosphere under standard testing conditions. It is defined as the percentage of moisture present in a fibre relative to its oven-dry weight. The mathematical expression for moisture regain is \[ \boxed{ \text{Moisture Regain (\%)}= \frac{\text{Weight of Water in Fibre}} {\text{Oven Dry Weight of Fibre}} \times100 } \] Different textile fibres have different moisture regain values depending on their chemical composition and molecular structure. Natural protein fibres generally possess higher moisture regain than most synthetic fibres because they contain hydrophilic groups capable of attracting water molecules.

Step 1: Recall the standard moisture regain values of common textile fibres.
Some commonly used standard moisture regain values are \[ \begin{array}{|c|c|} \hline Fibre & Moisture Regain (\%) \hline Cotton & 8.5 \hline Flax & 12 \hline Wool & 14-16 \hline Silk & 11 \hline Viscose Rayon & 11-13 \hline Nylon & 4-4.5 \hline Polyester & 0.4 \hline Acrylic & 1-2 \hline \end{array} \] From the standard textile data, \[ \boxed{\text{Moisture Regain of Silk}=11\%.} \]

Step 2: Compare the given options.
The options are \[ \begin{aligned} (A)\;& 6.2 (B)\;& 7.5 (C)\;& 4.25 (D)\;& 11 \end{aligned} \] Since the standard moisture regain of silk is \[ 11\%, \] the correct option is \[ \boxed{(D)\;11.} \]

Step 3: Write the final answer.
Hence, the percentage of moisture regain of silk is \[ \boxed{11\%.} \] Therefore, \[ \boxed{\text{Option (D) is the correct answer.}} \]