Technical

Polyethylene / UHMWPE

Polyethylene fibers include high-performance ultra-high-molecular-weight grades.

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

Key figures

US generic name: olefin (16 CFR 303.7)
EU fibre name: polyethylene
UHMWPE molar mass: typically millions of g/mol
UHMWPE spinning route: gel spinning, then ultra-drawing
Buoyancy: floats in water

Approximate values under the stated conditions.

Overview

Polyethylene fibers include high-performance ultra-high-molecular-weight grades. Generic polyethylene and specialized UHMWPE yarn are not interchangeable.

Feel and behavior

Light and potentially very strong in engineered grades.

Where you find it

Ropes, protective textiles, reinforcement and technical products.

Source and geography

Polyethylene fibers are made from ethylene, a petrochemical monomer, but the category spans very different materials. Ordinary melt-spun polyethylene serves for monofilament, nets, tapes and bicomponent nonwoven fibers, while ultra-high-molecular-weight polyethylene (UHMWPE) is gel spun into high-performance yarn by a small number of specialist producers. Dyneema, owned by Avient Corporation since 2022, and Spectra are widely used UHMWPE brand names; grades differ within and between brands, so a buyer needs the producer's data sheet rather than the generic name alone.

Advantages

Very high strength per unit weight makes light ropes, slings and armor panels possible.
It floats and absorbs almost no water, so lines stay light and strong when wet.
It resists abrasion, flexing and many chemicals, which suits marine and industrial use.
A Dyneema producer factsheet reports smaller strength losses under long-term ultraviolet exposure than for other high-tenacity fibers.
It gives cut resistance in thin, flexible knitted gloves.

Drawbacks

It melts at roughly 144 to 152 C, and a producer factsheet lists continuous use only up to about 70 C.
It creeps under sustained load, so static mooring and lifting uses must be engineered for it.
Its slippery, nonpolar surface resists dyes, glues and resins, and knots and splices need specific designs.
A cut rating says nothing about needle or spike puncture, which EN 388 tests separately.
High-grade yarn is expensive and hard to recycle once blended with glass, steel or coatings.

Worth knowing

The straight-blade TDM test entered EN 388:2016 partly because the rotating coup-test blade dulled on yarns containing glass or steel fiber, giving unreliable scores.
Gore's ePE membrane, used from Fall/Winter 2022, is expanded polyethylene, the same polymer family as Dyneema, replacing a fluoropolymer in some rainwear.
UHMWPE rope floats, which makes it popular for tow lines and marine work where sinking lines foul propellers.

Types, grades and fabrics

Types and grades

Polyethylene fiber comes in two classes that share a chemical name and little else. Commodity grades are melt spun into monofilament, slit tape and the low-melting sheath of bicomponent binder fibers, with modest tenacity. Ultra-high-molecular-weight polyethylene, also sold as HMPE or HPPE, is gel spun into multifilament yarn and supplied in counts ranging from fine glove yarns to heavy rope yarns, as unidirectional sheet for armor, and as chopped fiber. Dyneema and Spectra are brand families, each with many numbered yarn types that differ in tenacity, modulus and creep behavior, so the grade code on the data sheet matters more than the brand. Expanded polyethylene (ePE) membranes, which Gore began using in Gore-Tex products from Fall/Winter 2022, are a porous film, not a fiber.

Fabrics and products

The most familiar consumer product is the knitted cut-resistant glove shell, often dipped in polyurethane or nitrile on the palm and, at higher cut classes, plaited with glass or stainless steel filament. UHMWPE is also braided into mooring lines, slings, winch lines and fishing line; woven and knitted into cut-resistant sleeves, aprons and motorcycle garment linings; cross-plied into unidirectional sheets pressed into soft and hard armor; and laminated between films as Dyneema Composite Fabric for ultralight tents and packs. Ordinary polyethylene appears in shade netting, artificial turf yarn and nonwoven binder fibers.

Buying and care

How to judge quality

For gloves, read the EN 388:2016 pictogram: the letter from the ISO 13997 straight-blade (TDM) test runs from A, starting at 2 newtons, to F, at 30 newtons or more, and it is the more reliable cut figure for yarns containing glass or steel, which dull the rotating coup-test blade. In North America, ANSI/ISEA 105-2016 ranks gloves A1 (200 to 499 grams) to A9 (6,000 grams or more) on the ASTM F2992 method. For rope, ask for the grade code, certified breaking strength and published creep data rather than a brand name. Red flags are 'HPPE' or 'Dyneema-grade' claims without a test report or content label, and cut ratings quoted without the standard and test method.

Care in detail

Wash cut-resistant gloves as the label directs, typically in warm rather than hot water with a mild detergent, and avoid chlorine bleach, which can attack coatings and any blended fibers. Air dry or tumble at low heat, and never iron: strength starts to fall well below the melting range. Inspect gloves before each shift and discard them once the knit is cut, worn thin or the coating peels, because the rating applies only to an intact glove. Rinse salt and grit out of ropes, dry them out of direct sun and away from heaters, and watch for glazing where the line has run over a drum or capstan, a sign of friction heat.

Care at a glance

Use the manufacturer’s application-specific maintenance and handling instructions. Technical performance cannot be inferred from household laundry guidance.

Environmental and social footprint

UHMWPE is a fossil-derived polymer, and gel spinning dissolves it at low concentration in hydrocarbon solvent that must be recovered and recycled, which adds energy use; this atlas found no independent, peer-reviewed cradle-to-gate footprint for gel-spun yarn to cite, so figures in marketing should be treated as producer claims. The fiber is not biodegradable, and cut-resistant gloves that combine UHMWPE, glass, steel and polymer coatings are difficult to recycle and usually end as waste. On the positive side, its low weight can reduce fuel use in lifting and marine gear, and Gore states that its ePE membrane has a lower carbon footprint than the earlier ePTFE membrane, a producer claim rather than an independent finding.

Tradeoffs

Evaluate the specified grade, whole product, useful lifetime and realistic recovery route. A technical property does not establish a lower overall impact.

A useful question to ask: What exact material, product form and documented producer stand behind this name?

Science

Data sheet

Property	Value	Conditions	Source
Density	0.97 g/cm3	gel-spun UHMWPE (Dyneema), producer data; specific gravity below water	[1]
Tenacity	2.5 to 3.4 N/tex	Dyneema SK75 yarn, producer data	[2]
Elongation at break	3 to 4 %	Dyneema SK75 yarn, producer data	[2]
Melting point	144 to 152 C	gel-spun UHMWPE (Dyneema), producer data	[1]
Tensile modulus	109 to 132 GPa	Dyneema SK75 yarn, producer data	[2]
Continuous use temperature	up to about 70 C	gel-spun UHMWPE (Dyneema), producer data	[1]

Application-specific engineered material

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

Structure and chemistry

Polyethylene is the simplest polymer chain, repeating CH2 units with no side groups and no polar bonds. In ordinary grades, chains fold into lamellar crystals and the fiber is weak and extensible. In UHMWPE the molar mass is typically in the millions of grams per mole, and gel spinning followed by ultra-drawing converts folded lamellae into extended, highly aligned straight-chain crystals; small-angle X-ray scattering has tracked this transformation during drawing. Because chains interact only through weak van der Waals forces, load transfer depends on chain length and alignment, which gives very high strength per unit weight but also creep under sustained load.

From source to yarn

Conventional polyethylene fiber is melt spun and drawn like polypropylene. UHMWPE cannot be melt spun in the normal way because its extremely long chains are too entangled, so it is gel spun: the polymer is dissolved at low concentration in a hot hydrocarbon solvent to reduce entanglements, extruded, and quenched into a gel filament. Controlled gel-spinning experiments show that when the extension rate is fast relative to the solution's relaxation time, strongly anisotropic crystals already form on the spinline. The solvent is then removed and the filament is drawn many times its length just below its melting point, unfolding the chains. Yarns are braided into ropes, woven, or laid into unidirectional sheets for armor.

Performance in use

Gel-spun UHMWPE combines very high specific strength and modulus with low density, low moisture uptake, good abrasion and cut resistance and resistance to many chemicals. Its nonpolar surface makes adhesion to resins and dyeing difficult. Its melting point is low compared with aramids, so strength falls at elevated temperatures, and creep must be designed for in mooring lines and slings. It appears in cut-resistant workwear, sometimes combined with polyester and stainless-steel filament, in high-strength orthopaedic sutures, where it reduces abrasion failures, and in dental fiber reinforcement.

How it is identified

Burn tests are indicative only: polyethylene melts, drips and burns with a candle-wax odor, and UHMWPE yarn behaves the same way despite its strength. It floats in water, unlike aramid, glass or carbon fiber. FTIR identifies polyethylene, and differential scanning calorimetry shows a polyethylene melting peak where aramids show none. Separating UHMWPE from ordinary polyethylene requires mechanical testing or molecular-weight and orientation data, because the chemistry is identical.

History

Timeline

1979DSM researchers invented and patented a gel-spinning route in which ultra-high-molecular-weight polyethylene is spun from a dilute solution and drawn into a nearly extended-chain fiber (Smith and Lemstra). [3]
1990Commercial production of gel-spun polyethylene fiber under the Dyneema name began at Heerlen, the Netherlands, after an earlier pilot stage. [4]
2022Avient completed its purchase of DSM Protective Materials, the Dyneema business, on 1 September. [5]
2022Gore began using expanded polyethylene (ePE) membranes in some Gore-Tex products from the Fall/Winter season, a porous film of the same polymer family rather than a fiber. [6]

High-performance polyethylene yarn developed from advances in polymer preparation and drawing. Brand names often identify particular grades rather than a separate chemical family.

The deeper record

Polyethylene was long regarded as a poor fiber polymer because its folded-chain crystals carried little load. Gel spinning changed that by showing that disentangling very long chains in solution, then drawing them to extreme ratios, could produce nearly extended-chain fibers. The Dutch company DSM commercialized the technology under the Dyneema name and sold that business to Avient, a transaction completed on 1 September 2022. UHMWPE yarns have since spread from armor, ropes and fishing lines into cut-resistant workwear, orthopaedic sutures and dental reinforcement fibers.

Labeling and law

In the United States polyethylene fibers, including UHMWPE, fall under the generic name olefin in 16 CFR 303.7, and EU labels use polyethylene under Regulation (EU) No 1007/2011. Trademarks such as Dyneema are not generic names. For protective and medical products the relevant evidence is certification of the finished product to its performance standard and, for sutures or implants, the device's regulatory documentation, not the fiber label.

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

Frequently asked

Is Dyneema stronger than steel?

Per unit weight, gel-spun UHMWPE is far stronger than steel wire, which is why a light Dyneema line can replace a much heavier steel cable. Per unit cross-section the advantage is smaller, and steel keeps its strength at high temperatures and does not creep, so each suits different jobs.

What does cut level A4 mean on a glove?

A4 is a class in the North American ANSI/ISEA 105-2016 standard. It means the glove material needed 1,500 to 2,199 grams of blade load to cut through in the ASTM F2992 straight-blade test.

Are cut-resistant gloves stab or needle proof?

No. Cut resistance is measured with a sharp edge sliding across the fabric, while puncture by a point is a different mechanism. EN 388 includes a separate puncture test with a round probe, and hypodermic needles pass between knit loops in many cut-resistant gloves.

Why do some Dyneema gloves feel cool?

Polyethylene conducts heat along the fiber better than most textile polymers, so thin UHMWPE knits can feel cool against the skin. That is a feel effect, not a protective rating, and it varies with knit density and coating.

Sources

Cite this page

Chaos. (2026). Polyethylene / UHMWPE. In Fibers of Earth: An independent textile atlas. https://www.hendrickresearch.com/fibers/materials/polyethylene/