Teijin Aramid has announced the introduction of Twaron PVB prepreg, consisting of Twaron fabric and a new, specially designed PVB thermoplastic. Teijin say the new prepreg offers advantages like longer shelf life and a stable ballistic performance over a broad temperature range.
Subjected to heat and pressure the new Twaron PVB prepreg can be shaped into all manner of anti-ballistic protective equipment: helmets, insert panels for ballistic vests or shaped panels for vehicle protection. Producers of protective equipment no longer need to install and run expensive refrigerated storage facilities, since the new Twaron PVB prepreg can be stored under normal conditions for an extended period of time. Systems that are currently used in the industry – based on PVB-modified phenolic resins – have a very limited shelf life, since they react to high temperatures and therefore become unusable.
Performance tests have shown that, both in helmet shells and hard ballistic configurations, the new prepregs ballistic performance against bullets and fragments exceeds that of conventional PVB phenolic systems. In accordance with STANAG 2920, Twaron PVB prepreg has also been tested on temperature tolerance. These tests show very little differences in the ballistic performance between the plates stored at -20°C, +70°C and those stored at room temperature.
Twaron PVB film has been designed for usage with the same Twaron fabrics that manufacture protective equipment already used today – including Twaron CT736, Twaron T750, Twaron T741, and Twaron T734. During the production process the PVB film is layered and bonded with these Twaron fabrics to form a though, durable material.