Heavily utilized as an all-around industrial thread in many industries, Perma Core maximizes seam quality and minimizes sewing problems. Manufactured with a continuous filament polyester core and a polyester staple wrap, this thread provides great strength and superb abrasion resistance versus staple spun products. Perma Core is available in a silicone free finish to help negate the potential for lube migration into sensitive fabrics. Fiber Type: Polyester Core, Polyester Wrapped Finishes: Soft Thread Construction: Core Spun- Polyester Wrap Application: General - for sewing light and heavy weight garments Fiber Resistance to Acid- Excellent Fiber Resistance to Alkali- Fair Fiber Resistance to Bleach- Excellent Fiber Abrasion Resistance- Good Fiber Resistance to Heat- 145 deg C (Highest continuous temperature before breakdown) Fiber Melting Point- 265 deg C