Fiber family
Elastane Blends
A blend is usually named after the fiber it mostly is, and governed by the fiber it barely is.
What this fiber is
Spandex, sold as elastane and under brand names, appears in University of Georgia Extension listings among the manmade fibers of chemical origin. In a garment it is rarely the majority. A pair of jeans might be a few percent elastane and be sold, thought of and washed as cotton. The Extension notes that adding synthetic fibers to a blend improves strength, wash and wear behavior, shrink and stretch resistance, abrasion resistance and crease retention, which is exactly why the small percentage is there and exactly why losing it ruins the garment.
What each product class does here
- Chlorine bleach
- University of Georgia Extension lists the fabrics chlorine bleach can be used on as washable, colorfast cotton, linen, synthetic and permanent press, and names lycra as the exception, directing the reader to the care label. A blend that is mostly cotton is not thereby covered.
- Fabric softener
- Waistbands, socks and sports blends are where elastane and technical finishes overlap in the same garment. The care label is the only authority this site will point at for that combination.
- Oxygen bleach powders and paks
- The listings in this class describe color safety on colored fabric. Colorfastness and elastic recovery are two different properties, and a claim about one is not a claim about the other.
- Detergent sheets
- Nothing in any sheet listing on this site addresses blends. Where the listing is silent, this site records the silence rather than deciding what it meant.
What damages it permanently
University of Georgia Extension excludes lycra from the fabrics chlorine bleach can be used on and describes chemical-source manmade fibers as very heat sensitive. Elastane that has lost its recovery is the clearest permanent failure in a laundry room, because the garment still looks correct folded and does not fit when worn. Nothing later in the wash cycle restores it.
This site gives no instructions for rescuing an item that has already been damaged. That is a job for the garment maker or a professional cleaner, and guessing at it here would be worse than saying nothing.
Conflicts that land here
- Fabric Softener and Technical FabricsThis is the one pairing on the site with no government or academic document behind it. The care label on the garment is the authority, and under the FTC Care Labeling Rule that label has to be there.
- Chlorine Bleach and Other CleanersCDC instructs never to mix bleach with ammonia or any other cleaner. University of Georgia Extension states that mixing chlorine bleach with other cleaning products may produce noxious fumes.