Ethan Clarke
Kevlar is a type of plastic with a unique set of properties that make it suitable for a wide range of applications. It is a synthetic fibre with high tensile strength, low weight, and density, and excellent impact resistance. Kevlar is well-known for its use in personal armour such as bulletproof vests and helmets, but it is also used in various other products, including car brakes, boats, aerospace engineering, sports equipment, and fibre optics. Its exceptional characteristics are due to its internal structure, with molecules arranged in regular, parallel lines, and the way it is processed into tightly knitted fibres.
| Characteristics | Values |
|---|---|
| Type of Plastic | Synthetic polymer |
| Chemical Composition | Poly-paraphenylene terephthalamide (K29) |
| Molecular Structure | Many inter-chain bonds, with hydrogen bonds |
| Strength | Up to 10 times stronger than steel at the same weight |
| Tensile Strength | 3,620 MPa (525,000 psi) |
| Relative Density | 1.44 (0.052 lb/in3) |
| Heat Resistance | Up to 425ºC or 800 degrees Fahrenheit |
| Decomposition Temperature | ~450°C (850°F) |
| Performance | Maintains strength and resilience down to cryogenic temperatures (−196 °C (−320.8 °F)) |
| Uses | Body armour, fibre optic cables, ropes, cables, aircraft, ships, rail cars, personal armour, helmets, gloves, sleeves, jackets, chaps, motorcycle safety clothing, etc. |
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What You'll Learn
Kevlar is a synthetic plastic
The plastic was first introduced in 1971, after being discovered in the early 1960s by US chemist Stephanie Kwolek, who earned a US patent for her invention with Paul Morgan in 1966. Kwolek's goal was to create a lightweight replacement for steel bracing in vehicle tires, but its exceptional strength-to-weight ratio soon saw it adopted for other applications.
Kevlar's strength comes from its internal structure, with molecules naturally arranged in regular, parallel lines, and from the way it is made into fibres that are tightly knitted together. It is so strong that it is used in bulletproof vests and helmets, and it is often described as being five to ten times stronger than steel of the same weight.
Kevlar has a range of applications beyond body armour, including in the reinforcement of ropes and cables, and in the manufacture of boats, aircraft, ships, rail cars, and brake pads. It is also used in motorcycle safety clothing and high-heat resistance uniforms for firefighters.
Kevlar is an excellent material for use in cryogenics, as it maintains its strength and resilience down to extremely low temperatures. However, it is susceptible to UV degradation, and so it is rarely used outdoors without protection against sunlight.
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It's a type of aramid fibre
Kevlar is a synthetic plastic polymer with a chemical structure of poly-paraphenylene terephthalamide (K29). It is a type of aramid fibre, also known as polyamide, which is derived from benzene. This results in a fibre with extremely long molecular chains, giving it a rigid, almost ridge-like structure.
Kevlar is known for its strength and resilience, particularly at low temperatures. It is often used in cryogenics due to its low thermal conductivity and high strength relative to other materials. It is also used in personal armour, such as combat helmets, ballistic face masks, and bulletproof vests, where its strength and lightweight nature are advantageous.
The unique properties of Kevlar are due to its internal structure and the way it is processed. The molecules within Kevlar are naturally arranged in regular, parallel lines, forming inter-chain bonds. These inter-molecular hydrogen bonds provide Kevlar with its strength, which can be up to 10 times stronger than steel at an equal weight. The fibres are spun tightly together, making them nearly impossible to separate.
Kevlar has a high resistance to heat and does not melt, drip, or produce gases that promote combustion. It can withstand temperatures up to 425ºC or 450°C (850°F), and its strength is only slightly reduced at low temperatures, making it suitable for use in Arctic conditions. However, it is susceptible to UV degradation from sunlight, and long exposure to ultraviolet light can cause discolouration and degradation of the fibres.
Kevlar has a wide range of applications, including in ropes and cables, automotive and aerospace parts, and personal protective equipment. It is often used as a replacement for steel or fibre glass-reinforced plastic due to its strength and lightweight properties.
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Kevlar is used in body armour
Kevlar is a type of plastic with a very high tensile strength. The molecules are aligned parallel to each other and are very tightly bound, making the material bulletproof. Kevlar is best known for its use in ballistic body armour, vests, helmets, and other lightweight military equipment.
Kevlar is a synthetic fibre with a molecular structure of many inter-chain bonds that make it incredibly strong. It is a heat-resistant para-aramid synthetic fibre with a tensile strength that can be up to 10 times stronger than steel on an equal weight basis. Kevlar is also flame-resistant, protecting against thermal hazards up to 800 degrees Fahrenheit (426 degrees Celsius).
When a bullet or other high-velocity projectile hits Kevlar, the fibres absorb and dissipate the energy, essentially catching the projectile. This is due to the fully extended and perfectly aligned molecular chains within the Kevlar fibre, which provide a strong protective barrier against slashes, cuts, and punctures. Kevlar is also used in riding shoes, firefighting apparel, body pads, gloves, and motor sport helmets.
Kevlar has a variety of applications beyond body armour, including in the aerospace and law enforcement industries. It is used to make hoses, belts, aircraft parts, ship hulls, and tires. Kevlar is also used in sports equipment such as snowboards, skateboards, and surfboards. In addition, Kevlar can be used to create fibre optic cables, providing flexibility, strength, and protection against damage.
Kevlar does have some disadvantages, including its high cost and poor compressive properties. It also has a limited service life of around 5 years, after which its strength may be compromised.
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It's stronger than steel
Kevlar is a synthetic plastic polymer with a chemical structure that makes it incredibly strong. It was created by US chemist Stephanie Kwolek at DuPont in 1965 and introduced in 1971. Kevlar is known for its high tensile strength-to-weight ratio, which makes it an impressive five to ten times stronger than steel by weight.
The strength of Kevlar comes from its internal structure and the way it is made into fibres. Its molecules are naturally arranged in regular, parallel lines, forming inter-chain bonds with hydrogen bonds that provide tensile strength. These chains are cross-linked, and the fibres are tightly spun and knitted together, making it nearly impossible to separate them.
When a bullet or other high-velocity projectile hits Kevlar, the fibres catch the projectile and absorb and dissipate its energy. The fibres deform and stretch, spreading the force of the impact over a large area. This is why Kevlar is often used in bulletproof vests and body armour, as it can protect against slashes, cuts, and punctures.
In addition to its strength, Kevlar is also lightweight and flexible, making it ideal for various applications. It is used in ropes, cables, and fabrics, and it has replaced steel in racing tires and structural components of cars. It is also used in personal protective gear, such as gloves, jackets, and motorcycle safety clothing, due to its ability to protect against cuts, abrasions, and heat.
Kevlar's unique properties make it a versatile and valuable material, demonstrating that not all plastics are created equal. Its strength, compared to steel, has revolutionised various industries and made it a go-to choice for many applications where durability and lightweight protection are required.
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Kevlar is heat-resistant
Kevlar is a super-strong plastic with a unique internal structure and incredible heat-resistant properties. Its molecules are arranged in regular, parallel lines, and it is made into fibres that are tightly knitted together, giving it exceptional strength. Kevlar is a synthetic fibre, specifically a para-aramid synthetic fibre, and it was created by DuPont™ chemist Stephanie Kwolek.
Kevlar's heat-resistant qualities are due to its molecular structure, which is made up of many inter-chain bonds. These chains are cross-linked with hydrogen bonds, and Kevlar is inherently flame-resistant, protecting against thermal hazards up to 800 degrees Fahrenheit (426 degrees Celsius). It is used in heat-resistant uniforms for firefighters and protective gear for police officers, such as gloves, sleeves, and jackets, offering defence against heat, cuts, and abrasions.
Kevlar is also used in wicks for fire dancing props, where its high heat resistance allows the wicks to be reused multiple times. It is even used as a substitute for Teflon in non-stick frying pans. In addition, Kevlar is replacing fibreglass-reinforced plastic in NASCAR race car bodies and air dams because it doesn't shatter or leave hazardous debris on the track after a crash. Its heat resistance and strength make it ideal for these applications, where it can absorb impact forces that could otherwise cause severe damage or injury.
Kevlar's heat resistance also extends to very low temperatures. It remains effective down to -196 degrees Celsius (-320 degrees Fahrenheit), making it suitable for use in Arctic conditions. This wide range of temperature tolerance, from extremely low to high temperatures, showcases Kevlar's versatility and adaptability in various environments and applications.
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Frequently asked questions
Kevlar is a synthetic plastic with a unique molecular structure that makes it incredibly strong. It was invented by chemist Stephanie Kwolek while working for DuPont in the 1960s.
Kevlar is best known for its use in ballistic body armour, such as bulletproof vests and helmets. It is also used in a wide range of applications, including ropes, cables, brake pads, boats, aircraft, ships, rail cars, and fire-resistant clothing.
Kevlar is known for its exceptional tensile strength, which can be up to 5 times stronger than steel by weight. It has a high ballistic and shear-cutting resistance and can withstand temperatures up to 425ºC without melting or dripping.
