Polybutylene Terephthalate (PBT)

Continuous polybutylene terephthalate filament is an innovative stretch sewing thread engineered for high-extension seam applications, delivering good strength, high elasticity, and superior sew-ability.

Main Application

  1. Mainly used for garments containing highly stretchable fabrics or high spandex percentage.
  2. Designed for stretch seam applications in performance sportswear and activewear.
  3. Perfectly suited for stretch jeans and jeggings, enabling next-generation seam construction.
  4. Ideal for application in neck seams and hemming operations, providing enhanced seam performance and durability.
  5. Ideal for swimming, hiking, training, and a wide range of fitness activity wears, offering versatile performance across both indoor and outdoor use.

“ecoFLEX” is an engineered sewing thread designed to deliver high stretchability, exceptional seam extensibility, excellent sew-ability, and strong seam performance. Made from polybutylene terephthalate (PBT), it provides a next-generation solution for garments made with highly stretchable fabrics or high spandex content.

Product Range

Article Ticket

Ticket

Tex

Length (m)

Strength (cN)

Elongation (%)

PB01120

120

27

3000

915

55-75

PB01050

50

60

2000

1700

65-85

What makes ‘ecoFLEX’ stand out?

  • Delivers outstanding elasticity combined with durable seam strength and excellent sewing efficiency.
  • Provides superior elasticity for lockstitch and chain stitch seam types.
  • Features controlled elongation to enhance seam stability in stretch fabrics.
  • Complies with Oeko-Tex Standard 100 Class-I.

Physical Properties: Shrinkage at 150°C <1%, melt at 250°C - 260°C & moisture regain 0.4%.

Chemical Properties: Resistance to most of mineral acid & weak alkali but less resistance to strong alkali. Also, unaffected by mildew & rot.

Color Fastness Properties: To wash at 60°C (ISO 105 C06-C2S)≥4, rubbing dry (ISO 105X12)≥4, water (ISO 105 E01)≥4, dry cleaning (ISO 105 D01)≥ 4, artificial daylight (ISO 105 B02)≥5, perspiration (ISO 105 E04)≥4 & bleaching with hypochlorite (ISO 105 N01)≥4-5.