Manufacturer · Fashion & Home Accessories
Elastic loses stretch when its elastic threads are damaged or broken. The most common causes are washing and drying at high temperatures, chlorine and harsh detergents, sun exposure, constant strong stretching, and choosing the wrong elastic for the product. Some causes depend on the manufacturer, others on care.
How elastic works and why it wears out
Every elastic contains two groups of threads: elastic (natural rubber or elastane) and covering (polyester, polyamide or cotton). The elastic threads provide stretch, while the covering threads shape and protect the band. When the elastic threads age, break, or lose their properties, the elastic no longer returns to its original length. This appears as a wavy, stretched, or rolled elastic.
Main reasons elastic loses stretch
1. High temperature
Heat is the main enemy of elastic threads. Washing at 60 °C or higher, drying in a high-temperature dryer, drying on a radiator, and ironing directly on the elastic with a hot iron accelerate aging. Rubber threads are especially sensitive; elastane tolerates heat better but also has limits.
2. Chlorine and harsh detergents
Bleach, chlorine-containing detergents, and pool water damage both rubber and elastane. That is why swimwear and pool garments use elastic with special chlorine-resistant threads.
3. Sun, oils and creams
UV rays, body oils, creams and sweat gradually degrade rubber threads. This is one reason why underwear and sportswear are mostly made with elastane elastic.
4. Constant overload
If the elastic is too short or weak for the garment, it is constantly stretched near its maximum. This causes it to wear out much faster. Heavy fabric, many pockets, and tool belts are typical examples of overload.
5. Cut elastic threads
A straight stitch over stretched elastic, a blunt needle, or using a woven fabric needle instead of a knit needle can cut elastic threads. The elastic looks fine on delivery but loses strength after the first wear.
6. Old stock
Elastic, especially rubber-based, ages even while stored—in light, heat or near electric motors. Rolls stored for years in poor conditions may lose some stretch before cutting.
What manufacturers can do about elastic losing stretch
| Problem | Production solution |
|---|---|
| Washing at high temperature | Use elastane elastic instead of rubber |
| Heavy fabric, waistband sagging | Use wider woven elastic with strong stretch |
| Elastic rolling up | Use ribbed woven elastic, custom tunnel size |
| Broken threads during sewing | Use knit needle and elastic stitch |
| Swimwear and pool garments | Use chlorine-resistant elastic |
| Old stock | Rotate stock and store properly |
Dense woven elastic protects elastic threads better from friction because they are wrapped and compressed by the covering threads. Therefore, for garments washed frequently, it usually lasts longer than soft knitted elastic of the same composition.
Care labels are part of the solution
Many complaints about loose elastic come from incorrect care. If a garment has rubber elastic, the care label should not allow washing at 60 °C or drying at high temperature. Indicate realistic temperatures, "do not bleach" and "iron at low temperature" when elastic requires it. This protects both the customer and the brand.
Tips for users
- Wash garments with elastic at 30–40 °C unless the label allows higher;
- Do not use bleach or chlorine detergents;
- Dry flat or hanging, not on a radiator or high-heat dryer;
- Do not iron directly on the elastic;
- Rinse swimwear in clean water immediately after the pool.
How to test elastic before production
- Measure a piece of elastic at rest, stretch it several times to maximum, then measure again – good elastic almost fully recovers.
- Sew a test garment and wash it several times at the label temperature.
- Dry it as the customer will and check length and stretch.
- Compare samples with elastane and rubber elastic if unsure which to choose.
More about different constructions can be found in the elastic collection.
Knitted or woven – does it affect stretch loss?
The construction type affects how elastic visually "ages". Soft knitted elastic shows stretch loss quickly as wavy, stretched edges. Woven elastic holds its shape longer because the cross threads prevent the band from stretching in width and deforming. For heavily stressed waistbands that must look good long-term, woven elastic is usually the safer choice. For fine edges on underwear, soft knitted elastic remains suitable but must contain elastane and be sewn with elastic stitch.
Can stretched elastic be restored?
Unfortunately, no. Broken or damaged elastic threads do not recover. A temporary fix is to shorten the elastic in the tunnel, but it will continue losing strength. The only permanent solution is replacement with new elastic – in serial production this means choosing the right elastic from the start.
Quality elastic from Polkom
Polkom is a manufacturer of haberdashery based in Sofia. We help brands and workshops choose elastic according to fabric, care and stress, with samples before production and delivery across the EU. Describe your product and issue via the contact form.
