Kevlar Aramid Fabric is a high-performance synthetic Aromatic Polyamide (Aromatic Polyamide) material developed by DuPont in 1965, which is a typical representative of para-aramid. Its unique molecular structure and physicochemical properties make it a cutting-edge engineering material widely used around the world, especially in lightweight protection, composite materials, and extreme environments, where it is irreplaceable.
Kevlar is chemically known as Polyphenylene terephthalamide (PPTA), and its molecular chain consists of alternating benzene and amide bonds. The rigid structure of the benzene ring gives it a high modulus (resistance to deformation), while the amide bonds form a three-dimensional network through hydrogen bonding, which significantly enhances the bonding between the molecular chains, thus providing ultra-high strength and impact resistance.
Key Performance
Tensile strength up to 3,620 MPa, about 5 times that of high-quality steel, with a density of only 1.44 g/cm³ (1/5 that of steel).
Modulus of elasticity about 70-112 GPa, close to carbon fiber level.
Glass transition temperature (Tg) of about 345°C, decomposition temperature of more than 500°C, short-term temperature resistance of up to 400°C.
Resistant to most organic solvents, fuels, and weak acids and bases, but degrades in strong acid/base environments.
The high orientation of the molecular chains gives excellent friction and cut resistance.
Application Areas
Individual Protective Equipment (PPE)
Bulletproof vests/helmets: absorbing the kinetic energy of the slug through fiber layering and weaving, and dispersing the shock wave by using the shear thickening effect.
Anti-cutting gloves/clothing: using highly oriented fibers to resist the intrusion of knives.
Aerospace and Transportation
Aircraft skin, rocket engine casing: as a reinforcement of epoxy resin matrix composites, weight reduction of more than 30%.
Automotive lightweight components (e.g. brake pads, drive belts): high temperature resistance and fatigue resistance superior to traditional materials.
Industry and Energy
Deep-sea cable reinforcement: high pressure resistance, creep resistance.
Wind turbine blades: improved fatigue life against wind load.
