A Worthy Challenger
For decades, the para-aramid fiber market was effectively a DuPont monopoly. Kevlar was the only game in town for high-performance ballistic fibers, and DuPont leveraged this position with premium pricing. The emergence of Teijin Aramid, originally the Akzo Nobel aramid division, changed that equation. Their Twaron fiber offered equivalent ballistic performance at competitive pricing, and the latest generation, Twaron Next, pushes the performance envelope further.
Twaron Next is the result of over a decade of research and development at Teijin's fiber technology center in Arnhem, the Netherlands. The fiber incorporates modifications to both the polymer chemistry and the spinning process that deliver meaningful improvements in two key areas: flex fatigue resistance and heat aging stability. These improvements address the two most significant degradation mechanisms in aramid-based body armor, making Twaron Next particularly attractive for systems designed for extended service life.
Flex Fatigue Performance
Soft body armor is flexed thousands of times during normal wear. Every time the wearer bends, twists, or sits down, the ballistic panel deforms, creating localized stress in the fibers. Over time, this repeated flexing can initiate micro-cracks in the fiber structure, particularly at the interface between the crystalline skin and less-ordered core of the fiber. These micro-cracks reduce the fiber's tensile strength and, consequently, the panel's ballistic performance.
Twaron Next addresses flex fatigue through a modified coagulation process that produces a more homogeneous cross-sectional structure. By reducing the differential between the skin and core regions, the fiber develops fewer stress concentration points during flexing. Independent testing has demonstrated that Twaron Next retains over 90% of its initial tensile strength after 100,000 flex cycles, compared to approximately 82% for standard Twaron 2000 and 80% for standard Kevlar KM2.
Heat Aging Resistance
Aramid fibers degrade when exposed to elevated temperatures over extended periods. This thermal aging is caused by oxidative chain scission, where oxygen attacks the polymer backbone, breaking chains and reducing molecular weight. In body armor, this degradation is accelerated by the combination of heat, moisture from sweat, and UV exposure from ambient light. The NIJ mandates thermal conditioning as part of the certification process, but the conditions used, 65 degrees Celsius for 10 days, are far milder than what armor may experience over a 5-year service life in hot climates.
Twaron Next incorporates stabilizer chemistry that reduces the rate of oxidative degradation by approximately 40% compared to unstabilized para-aramid fibers. This means that armor constructed from Twaron Next maintains its ballistic certification for a longer period, reducing lifecycle costs for agencies that issue body armor to large numbers of officers.
Moisture Management
An often-overlooked property of Twaron Next is its reduced moisture regain. Standard para-aramid fibers absorb approximately 7% of their weight in moisture at standard conditions. This moisture absorption increases the weight of the armor panel and can also plasticize the fiber, temporarily reducing its mechanical properties. Testing has shown that wet aramid panels can lose 5-15% of their V50 velocity compared to dry panels.
Twaron Next achieves a moisture regain of approximately 4.5% through surface modification of the fiber during production. This lower moisture absorption means more consistent ballistic performance in humid conditions and during extended wear where sweat exposure is significant. For operators in tropical environments, this property alone can be the deciding factor in material selection.
Weave Compatibility
Twaron Next is available in the standard denier counts used in body armor construction: 930 dtex, 1100 dtex, and 1680 dtex. It can be woven on existing looms in all standard ballistic weave patterns, including plain weave, basket weave, and the higher-density weaves used in multi-threat panels. The fiber also performs well in UD layup constructions, where it can be combined with thermoplastic or thermoset matrices.
Teijin provides comprehensive weave design support to armor manufacturers, including finite element modeling of ballistic events to optimize weave density and ply count for specific threat levels. This technical support, combined with competitive pricing, has made Twaron Next an increasingly popular choice among European and Asian armor manufacturers.
GoatArma™ Applications
GoatArma™ evaluates materials purely on performance and suitability for specific applications, without brand loyalty. Twaron Next has earned its place in our material stack based on its superior flex fatigue performance, which is critical for the CAPRASKIN™'s flexible panel architecture. Our armor inserts are designed to be thinner and more flexible than traditional soft armor, which means they experience more flexing cycles during normal wear. Twaron Next's ability to maintain performance through these cycles directly supports our design intent.
We are also evaluating Twaron Next for the neck protection collar system, where the armor must flex through a wide range of motion around the cervical spine while maintaining consistent ballistic coverage. The reduced moisture regain is an additional benefit in this application, as the neck is a high-perspiration zone where sweat exposure to the ballistic material is continuous.