Brands & technologies · Para-aramid brand

Kevlar®

Para-aramid brand · understand the name behind the label.

Reviewed 2026-09-22. Evidence level: verified. Open the interactive profile.

Key figures

Owner: Arclin (since 1 April 2026)
Generic fiber: Para-aramid, poly(p-phenylene terephthalamide)
Sale value: about 1.8 billion dollars
Aramids business at sale: about 1,900 employees, five manufacturing sites
DuPont retained stake: about 16% of Arclin

Approximate values under the stated conditions.

Overview

A para-aramid product family used in engineered textile and composite applications. Whole-product testing determines protection.

Feel and behavior

Depends on the specified fiber grade, yarn and fabric construction.

Where you find it

See the linked underlying material and the producer’s product-specific documentation.

Source and geography

Kevlar is a para-aramid brand now owned by Arclin, a US chemical company that is a portfolio company of an affiliate of TJC, L.P. DuPont created the brand and sold its Aramids business, including Kevlar and Nomex, to Arclin; the deal was announced on 29 August 2025 and completed on 1 April 2026 at a value of about 1.8 billion dollars. DuPont retained a minority equity stake of about 16% in Arclin. The generic fiber is para-aramid, poly(p-phenylene terephthalamide) (PPTA).

Advantages

Para-aramid combines very high tensile strength and modulus with low density, making protective items light.
It does not melt and chars only at high temperature, so it is inherently flame resistant.
Distinct grades let engineers choose between toughness for armor and stiffness for composites.
Kevlar EXO is described by its developer as keeping the same protection after five years as on day one.

Drawbacks

UV light degrades it, so exposed fabrics lose strength unless covered or coated.
Its compressive strength is poor, and fibers split into fibrils when cut or abraded.
It absorbs some moisture, which can reduce ballistic performance unless panels are sealed.
It is hard to dye and hard to recycle, and costs far more than common fibers.

Worth knowing

Kevlar 49 is made by heat-treating Kevlar 29 under tension, which raises chain alignment and stiffness without changing the polymer.
DuPont announced Kevlar EXO in April 2023 as its most significant aramid fiber innovation in more than 50 years, made at its Spruance plant in Virginia.

Types, grades and fabrics

Types and grades

Kevlar grades share the same PPTA polymer but differ in crystallinity, orientation and finish. Kevlar 29 is the basic high-tenacity grade used in ropes, cables, protective apparel and soft armor. Kevlar 49 is a high-modulus grade made by heat-treating the fiber under tension, favored for composites in aerospace, marine and sporting goods. Kevlar 129 offers higher tenacity for ballistic uses such as vests and helmets. Kevlar KM2 was developed for military fragmentation protection with high toughness and energy absorption. In April 2023 DuPont announced Kevlar EXO, described as a new aramid fiber platform made at Spruance, Virginia, that it said gives the highest ballistic performance among aramid fibers with more flexibility. Pulp and short-cut forms serve friction materials and gaskets.

Fabrics and products

Kevlar filament is woven into plain-weave ballistic fabrics layered in soft armor, laminated into helmets and hard panels, and woven or knitted into cut-resistant gloves, sleeves and chainsaw chaps. Kevlar is blended in small shares with meta-aramid, as in Nomex IIIA, to strengthen flame-resistant clothing. Composite fabrics reinforce canoes, kayaks, bicycle parts and aircraft panels. It also reinforces tires, belts, hoses, ropes, fiber-optic cables and motorcycle clothing. In each case the tested construction, not the fiber name, defines protection.

Buying and care

How to judge quality

For protective products, buy on certification, not fiber content: body armor should be certified to the applicable ballistic standard (in the US, the National Institute of Justice standard), and gloves should show cut ratings under standards such as EN 388 or ANSI/ISEA 105. Check labels for panel manufacture date and model, and that certificates match the exact model. Undyed para-aramid is golden yellow; black or colored items may be solution-dyed. Beware 'Kevlar-lined' or 'Kevlar blend' claims without percentages, and counterfeit panels sold online without traceable certification. For composites, specify the grade (29, 49, 129) and fabric style.

Care in detail

Protective items need the manufacturer's instructions above all. Soft armor panels should be removed from carriers before washing the carrier; panels are usually wiped with a damp cloth and mild soap, never machine washed, soaked, dry cleaned or ironed. Keep panels flat and out of sunlight; do not fold or crush them. Replace armor according to the manufacturer's service life and after any ballistic hit. Kevlar gloves and sleeves can often be washed warm with mild detergent, but chlorine bleach damages aramid and should be avoided. Inspect cut-resistant gear for fraying, holes and thinning, and retire it when worn.

Care at a glance

Follow the finished product’s care label. A trademark does not specify the care needs of every blend or construction.

Environmental and social footprint

Public, independent life-cycle data for Kevlar were not found for this entry, so figures are not given here. Qualitatively, PPTA is made from p-phenylenediamine and terephthaloyl chloride, and the polymer is spun from concentrated sulfuric acid, which must be recovered or neutralized; these are energy- and chemical-intensive steps compared with commodity fibers. Against that, para-aramid items are often long-lived and used in small quantities for their function, and protective equipment has a safety benefit that is not captured by per-kilogram footprints. End-of-life options are limited: expired armor panels are generally discarded rather than reused, and aramid recycling is mostly limited to grinding into pulp or short fibers for fillers and friction materials. Ownership moved from DuPont to Arclin in 2026, so current environmental reporting should come from Arclin.

Tradeoffs

Producer claims apply to defined products and comparisons. This atlas does not independently certify performance, sourcing or environmental claims.

A useful question to ask: Which exact grade, composition and current producer documentation apply to this product?

Science

Data sheet

Property	Value	Conditions	Source
Density	1.44 g/cm3	Kevlar 29 and Kevlar 49 yarn, producer data	[1]
Equilibrium moisture	3.5 to 4.5 %	equilibrium from bone-dry yarn; Kevlar 49 about 3.5, Kevlar 29 about 4.5; producer data	[1]
Breaking tenacity	203 to 208 cN/tex	Kevlar 29 (23.0 g/den) and Kevlar 49 (23.6 g/den) yarn, producer data	[1]
Elongation at break	2.4 to 3.6 %	Kevlar 49 (2.4) and Kevlar 29 (3.6) yarn, producer data	[1]
Decomposition	about 427 to 482 C	does not melt; producer data	[1]
Tensile modulus	about 70 to 115 GPa	Kevlar 29 nominal about 70 to 80, Kevlar 49 roughly 115; producer data	[1]

Application-specific engineered material

Read the exact polymer, precursor and grade before comparing performance.

Structure and chemistry

PPTA consists of benzene rings joined at their para (1,4) positions through amide linkages, giving a straight, rigid rod-like chain. Hydrogen bonds between amide groups of neighboring chains form sheets, and the sheets stack through aromatic interactions. Because the rigid chains form a liquid-crystalline solution, spinning aligns them almost perfectly along the fiber axis, producing very high crystallinity, a highly oriented fibrillar structure, high tensile strength and modulus, and weak lateral cohesion that makes the fiber prone to splitting and poor in compression.

From source to yarn

In the generally described route, PPTA is made by low-temperature polycondensation of p-phenylenediamine with terephthaloyl chloride in an amide solvent. The polymer is dissolved in concentrated sulfuric acid to form a liquid-crystalline (anisotropic) dope, which is extruded through an air gap into a cold water bath (dry-jet wet spinning). The shear and extension in the gap orient the rod-like domains. The yarn is washed free of acid, neutralized and dried; high-modulus grades are heat-treated under tension. Yarns are then woven, knitted, cut to staple, pulped or used in composites.

Performance in use

Para-aramid combines high tensile strength and modulus with low density, which is why it is used in ballistic and cut-resistant products and composites. It does not melt; it decomposes and chars at high temperature and is inherently flame resistant. Weaknesses include degradation under UV light, sensitivity to strong acids and bases, poor compressive strength, and moisture uptake that can affect ballistic panels unless protected. It is difficult to dye and is often solution-dyed. Protective performance depends on the whole tested system.

How it is identified

Burn tests are indicative only and unsafe for protective items: para-aramid resists ignition, chars without melting and does not form a bead. Undyed fiber is characteristically yellow-gold. Microscopy shows smooth round filaments that split into fibrils when cut or abraded. FTIR distinguishes para-aramid from meta-aramid and from UHMWPE. Kevlar is often used loosely for any aramid or any cut-resistant fabric.

History

Timeline

1965Stephanie Kwolek at DuPont discovered the liquid-crystalline para-aramid solutions from which Kevlar fiber was later spun. [2]
2023DuPont announced Kevlar EXO in April as a new aramid fiber platform made at Spruance, Virginia. [3]
2025DuPont agreed on 29 August to sell its Aramids business, which had about 1,900 employees and five manufacturing sites, to Arclin. [4]
2026Arclin completed the roughly 1.8 billion dollar acquisition on 1 April, with DuPont retaining a stake of about 16% in Arclin. [5]

Kevlar grew from high-performance polymer research at DuPont. The official brand destination now identifies Arclin; the generic fiber remains para-aramid.

The deeper record

Kevlar came from DuPont's research into aromatic polyamides that form liquid-crystalline solutions, a discovery that allowed rigid-chain polymers to be spun into highly oriented fiber. DuPont commercialized it for tire reinforcement, body armor, ropes, composites and protective gloves, and the name became closely associated with DuPont for decades. In August 2025 DuPont agreed to sell the Aramids business, which had about 1,900 employees, five manufacturing sites and 2024 net sales of about 1.3 billion dollars, to Arclin. The sale closed on 1 April 2026.

Labeling and law

Kevlar is a trademark, not a generic name. Under the FTC rules at 16 CFR 303.7 aramid is the generic name for fibers of long-chain synthetic polyamide in which at least 85% of the amide linkages attach directly to two aromatic rings; EU labels must use aramid under Regulation (EU) No 1007/2011. For protective equipment, fiber labeling is separate from performance certification, which depends on the relevant product standard and tested configuration.

This describes what rules and standards cover. It is not legal advice; jurisdiction, product form and current rule text control.

Frequently asked

Is Kevlar bulletproof?

No fabric is bulletproof on its own. Kevlar layers, in a certified design and number of plies, can stop specified threats at specified velocities. Protection depends on the tested panel, and certified vests are rated for particular threat levels, not all bullets.

What is the difference between Kevlar 29 and Kevlar 49?

Both are para-aramid, but Kevlar 49 is heat-treated under tension to raise orientation and stiffness, so it suits composites. Kevlar 29 is tougher and more flexible, suited to ropes, armor and protective fabrics.

Who makes Kevlar now?

DuPont created Kevlar and sold its Aramids business, including Kevlar and Nomex, to Arclin, a US chemical company; the deal closed on 1 April 2026. DuPont retained a minority stake in Arclin, so check current reporting for the latest ownership.

Sources

Cite this page

Chaos. (2026). Kevlar®. In Fibers of Earth: An independent textile atlas. https://www.hendrickresearch.com/fibers/materials/kevlar/