The common type of Staple fibre produced during synthetic fibre manufacture is
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Remember the standard synthetic staple fibre specification:
\[
\boxed{
1.5\text{D} \times 38\text{ mm}
}
\]
where
\[
\begin{aligned}
\text{Denier (D)} &\rightarrow \text{Fibre fineness},
\text{38 mm} &\rightarrow \text{Staple fibre length for cotton spinning}.
\end{aligned}
\]
This specification is one of the most frequently asked objective questions in textile engineering examinations.