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Kevlar is the registered trademark for a para-aramid synthetic fiber, related to other aramids such as Nomex and Technora. Developed at DuPont in 1965, this high strength material was first commercially used in the early 1970s as a replacement for steel in racing tires. Typically it is spun into ropes or fabric sheets that can be used as such or as an ingredient in composite material components.

Currently, Kevlar has many applications, ranging from bicycle tires and racing sails to body armor because of its high tensile strength-to-weight ratio; by this measure it is 5 times stronger than steel on an equal weight basis.

Kevlar® 29 (K29)

The original family of product types of Kevlar®, having similar tensile properties with many deniers and finishes. These yarns are used in ballistic applications, ropes and cables, protective apparel such as cut-resistant gloves, in life protection uses such as helmets, vehicular armoring, and plates, and as rubber reinforcement in tires and automotive hoses.

Kevlar® 49 (K49)

High-modulus type used primarily in fiber optic cable, textile processing, plastic reinforcement, ropes, cables, and composites for marine sporting goods and aerospace applications.

Kevlar® brand fiber has provided a lightweight, flexible and dimensionally stable means of strengthening ropes and cables used across several industries, from mountaineering ropes and fishing lines to electro-mechanical cables and fine gauge cables for electronic device applications such as mobile phone cables, computer power cords, USB cords, and MP3 ear phone cables..
Its resistance to chemicals and temperature extremes make it an ideal component for ropes and cables under severe loads in harsh environments.

Kevlar® Product Specs


Available since 1987, Technora® is a very strong para-aramid fiber developed and produced exclusively by Teijin Limited. This aromatic copolyamid (co-poly-paraphenylene-oxydiphenylene terephthalamide) is ideal for dynamic performance applications involving significant motion.

The polymer is closely related to DuPont's Kevlar®.

Product Benefits: 

High tensile strength - Strong and light: weight for weight, Technora® is 8 times stronger than steel and 3 times stronger than fiberglass, polyester or nylon yarns.

Fatigue resistance - Shows little loss of strength even during repeated abrasion, flexing and stretching.

Dimensional stability - Stiff and highly oriented molecular structure leads to a high modulus of elasticity, low creep and low stress relaxation. Low thermal shrinkage, i.e., excellent dimensional stability.

Heat resistance - Thermal decomposition threshold of 500ºC, so Technora® can be used at 200ºC for long periods. At 250ºC, it maintains more than half of its room-temperature tensile strength.

Chemical resistance - Highly resistant to acids, alkalis and organic solvents; not vulnerable to damage caused by steam or sea water.


Spectra fiber 1000, the second in a series of Spectra fibers, was developed to meet customers’ needs for increased performance. It is available in a multitude of deniers for use in a wide range of applications.

This extended-chain polyethylene fiber has one of the highest strength-to-weight ratios of any man-made fiber. Spectra fiber 1000 has a tenacity 15 to 20 percent higher than that of Spectra 900. Spectra fiber is, pound for pound, 15 times stronger than steel, more durable than polyester and has a specific strength that is up to 40 percent greater than that of aramid fiber. Specific performance is dependent upon denier and filament count.

Product Benefits:

Light enough to float (0.97 g/cc specific gravity) High resistance to chemicals, water and ultraviolet light.

Excellent vibration damping.

High resistance to flex fatigue.

Low coefficient of friction.

Good resistance to abrasion.

Low dielectric constant makes it virtually transparent to radar.

What’s in a name?

Spectra, Dyneema or, UHMWP

Spectra (c) is a registered trade name of the U.S. firm Honeywell International Inc.
Dyneema (c) is a registered trade name of the Dutch company DSM Dyneema, B.V.
Both Spectra and Dyneema are chemically the same and are strictly manufactured to a stringent specification and they are both an Ultra High Molecular Weight Polyethylene.
“UHMWP” is the name that is often marketed as a generic Spectra or Dyneema and is also an Ultra High Molecular Weight Polyethylene. It is usually manufactured by off-shore companies who do not have a license by either of the two manufactures above. Chemically it is not the same. Quality is often times an issue. It is dirt cheap. You will get what you pay for in this case.
We fly our expensive kites, and would jump out of perfectly good airplanes with Spectra or Dyneema, but not the other stuff.


Vectran® HT is a high-performance multifilament yarn spun from liquid crystal polymer (LCP). Vectran® is the only commercially available melt spun LCP fiber in the world. Vectran® fiber exhibits exceptional strength and rigidity. Pound for pound Vectran® fiber is five times stronger than steel and ten times stronger than aluminum.

Product Benefits:

High strength and modulus.

Excellent creep resistance.

High abrasion resistance.

Excellent flex/fold characteristics.

Minimal moisture absorption

Excellent chemical resistance

Low coefficient of thermal expansion (CTE)

High dielectric strength

Outstanding cut resistance

Excellent property retention at high/low temperatures

Outstanding vibration damping characteristics

High impact resistance

For more Vectran® info

All Products are subject to the "Twinline, LLC Product Warranty and Disclaimer" - To review:

** TENSILE STRENGTHS shown are average based on new lines tested under laboratory conditions, and can vary by 10%.