A unique combination of properties
Mechanical properties
Twaron® yarns boast exceptional strength, with tensile strength two to three times higher than polyester and polyamide yarns, and up to six times higher than steel, when compared weight for weight. They maintain their key mechanical properties over a broad temperature range, ensuring durable reinforcement for a well-defined product lifetime. This lifetime varies based on load and temperature – higher loads and temperatures may shorten it.
However, with proper safety factors, Twaron® significantly extends the economic lifespan of products. While prolonged UV and blue light exposure can discolor and weaken individual fibers, this effect is often negligible for thicker applications like ropes or fabrics.
A unique combination of properties
Dimensional stability
Dimensional stability is critical for many applications, and the high modulus of Twaron® ensures minimal deformation under load. With very low and rapidly diminishing creep, products reinforced with Twaron® retain their dimensions over time. Its low, negative thermal expansion coefficient of just a few
ppm/°C further improves stability under temperature variations. Additionally, Twaron® resists shrinkage when exposed to hot air, maintaining the integrity of the final product in demanding conditions.
Stress/strain curve of various materials
N.B. As the data in the table above originate from a variety of sources, they may be subject to deviations resulting from different test methods and/or conditions. Exact values depend on type and application (please contact your Teijin Aramid representative for advice on product type selection).
A unique combination of properties
Thermal properties
Twaron® lacks a melting point and begins to decompose only at temperatures above 500 °C (932 °F). For heat-resistant uses, it’s advised to keep short-peak temperature exposures below 250 °C (482 °F) and long-term exposures under 100 °C (212 °F) to maintain its strength. Twaron® also preserves its mechanical properties at extremely low temperatures, down to -150 °C ( -238 °F), making it versatile for a wide temperature range. Additionally, Twaron® excels in thermal insulation due to its low heat conductivity. With a high limiting oxygen index (LOI), Twaron® stops burning once removed from flame, effectively limiting fire spread in reinforced applications.
Chemical resistance
Twaron® features high crystallinity and strong intermolecular bonds that prevent chemicals from penetrating its polymer structure. It offers good to excellent resistance to organic chemicals, while its resistance to inorganic chemicals depends on pH. However, exposure to concentrated strong acids or bases can lead to hydrolytic degradation.
A unique combination of properties
Twaron® compared to other fibers
*Ultra Tensile Steel belt wire (12500 dtex) N.B. As the data in the table above originate from a variety of sources, they may be subject to deviations resulting from different test methods and/or conditions. Exact values depend on type and application (please contact your Teijin Aramid representative for advice on product type selection).