We sell two kinds of fire retardant (FR) thread--fire retardant sewing thread for seams and general purpose sewing and fire retardant embroidery thread for names and logos. Both are UL® approved and meet these standards NFPA 1975-1999, NFPA 1971-1997, NFPA 1976-1992, and NFPA 1977-1998. More simply put, they do not melt and can withstand temperatures of 700°F (366°C) before they decompose. This compares to a 450°F (218°C) melt point for general purpose threads such as Nylon and Polyester. Please note that fire retardant is NOT fire-proof. These threads will burn when exposed to a 2500°F (1357°C) cigarette lighter.
About FR Sewing Thread--Use fire retardant sewing thread for sewing seams and attaching patches on clothing and gear used by first responders, race car drivers, and others who need protection from from fire and heat. It should only be used with fabrics and materials that have the same level of fire retardance.
FR Sewing Properties--Fire retardant sewing thread has a fuzzy cotton-like look. This is because it is a spun thread made by wrapping dyed cotton around a Kevlar™ or Nomex™ filament core.
FR Sewing Sizes--Thread thickness is measured using Tex sizes. As Tex size increases thread thickness, strength, and stitch visibility increase while the number of yards-per-pound decreases. Sizes 18 to 35 are for light duty seams and attaching patches; sizes 40 and 50 are for more durable seams; and higher sizes are for weight bearing attachments. Sewing sizes above Tex 70 usually requires a commercial sewing machine.
Kevlar and Nomex--Size-for-size spun Kevlar is stronger than spun Nomex. This is not important when sewing garment seams or attaching patches. Strength is very important when attaching harnesses or or buckles that hold someone's weight or equipment. In these cases use spun Kevlar, Tex 60 or higher.
Children's Garments--The U.S. and other countries require children's clothing to be made with fire resistant thread that withstands temperatures up to 450ºF. There are much less expensive polyester and cotton threads that meet this requirement. Sorry, we do not sell these threads.
FR Sewing Spool Sizes--We generally sell fire retardant thread in 1 Oz, 2 Oz, 4 Oz and 8 Oz spools and show the yardage for each spool size. A 1 Oz spool is all that is needed for most single-garment projects.
About FR Embroidery Thread--Use fire retardant
embroidery thread for embroidering names and logos on clothing and gear used by first responders, race car drivers, and others who need protection from from fire and heat. It should only be used with fabrics and materials that have the same level of fire retardance.
FR Embroidery Properties--Fire retardant embroidery thread is made from Nomex filament. It looks and sews like a top quality, low-sheen polyester embroidery such as Isacord or A&E Signature.
FR Embroidery Sizes--All thread is Tex 27 thread which is the same thickness as everyday, 40 Weight, embroidery thread. It has a 1.5 pound (0.65 kilo) tensile strength. It is not recommended for sewing seams or patches and should never be used for attaching weight bearing harnesses or buckles.
FR Embroidery Spool Sizes--We have fifteen colors and sell them in 500 yard and 3,000 yard spools. The 500 yard spools are usually enough for embroidering up to five names; 3,000 yard spools are recommended for logos.