Terpenes may be classified by the number of isoprene units in the molecule; a prefix in the name indicates the number of terpene units needed to assemble the molecule. 1  Hemiterpenes consist of a single isoprene unit. 2  Monoterpenes consist of two isoprene units and have the molecular formula C10H16.
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Although I have seen wool felt used for almost anything, do not use I it for projects. that get a lot of wear and tear, such as a hooked rug or bed quilt. Instead, I use wool. felt for penny rugs, table runners, candle mats, wall quilts and other projects that will. only need occasional spot cleaning or dry cleaning.