Dyneema-Seil

Q: What is Dyneema rope made of?

Dyneema rope is made of UHMWPE (Ultra High Molecular Weight Polyethylene). Avient's (formerly DSM) gel-spinning process creates very long polymer chains that give the exceptional strength. Dyneema is a brand name of Avient.

Q: What is the difference between Dyneema and Prorope HMPE?

Technically they are almost identical — both UHMWPE with comparable breaking strength, elongation and chemical resistance. Dyneema SK75 (yellow) and T70 Hawkline (grey) are the premium brand variants. Prorope HMPE offers the same performance at a sharper price, standard in blue and on request in any colour.

Q: Does Dyneema rope float or sink?

Dyneema floats. With a specific gravity of 0.98 g/cm³ it is lighter than water and absorbs virtually no moisture — ideal for maritime and offshore applications.

Q: How much breaking strength do I lose with a knot?

On our own test bench, 3 mm HMPE dropped from 4,188 N to 1,880 N with a knot (−55%), and 5 mm HMPE from 9,266 N to 4,834 N (−48%). Always finish Dyneema with a splice — that costs virtually no strength.

Q: How much does Dyneema gain from pre-tensioning?

Our 5 mm HMPE broke at 9,266 N un-tensioned, but at 10,642 N after pre-tensioning (+15%). Always pre-tension a new winch line or lifting line without maximum load.

Q: How strong is Dyneema compared to steel?

By weight, Dyneema is up to 15× stronger than steel. It weighs up to 85% less than steel wire of the same strength, does not rust, floats and does not recoil on failure the way steel does.

Q: Is Dyneema resistant to UV and chemicals?

Yes. Dyneema has good UV resistance and excellent resistance to salt water, acids and oil. For prolonged UV exposure we recommend a coated variant or a polyester sheath.

Q: Does a coating increase breaking strength?

No. Our 1.5 mm with coating (2,444 N) scored almost equal to the variant without (2,512 N), and the 2 mm with coating was even weaker. Choose coating for abrasion resistance or grip — not for strength.

Q: Which diameters and colours are available?

From 0.8 mm cord to 28 mm tow lines. SK75 is standard yellow, T70 Hawkline grey, Prorope HMPE blue (virtually any colour on request). Available by the metre — ordered before 13:00 = shipped the same day.

Q: Can kernmantel rope be broken internally with no visible damage?

Yes. In 5 of 5 tests the sheath remained visually intact while the core had broken completely. If you don't know the load history, replace the rope when in doubt. For critical applications: choose a fully braided 12-strand construction.

(10 produkte)

Suchen Sie ein Seil, das auch extremen Belastungen standhält? Mit Prorope entscheiden Sie sich für die unübertroffene Leistung von Dyneema-Seilen. 15-mal stärker als Stahl, ultraleicht und mit minimaler Dehnung. Dyneema ist die perfekte, zuverlässige Lösung für maritime, industrielle und extreme Outdoor-Projekte.

Sind Sie bereit herauszufinden, welches Dyneema-Seil all Ihren Anforderungen entspricht? Scrollen Sie nach unten, um die Spezifikationen unserer gesamten Kollektion zu sehen!

Breaking strength Extremely high4 mm braided HMPE breaks at 17,926 N (≈1,827 kg) on our own test bench.

Elongation at break 3–4%Minimal elongation — dimensionally stable under load. Ideal for winches and lifting.

Buoyancy FloatsSpecific gravity 0.98 g/cm³ — lighter than water, virtually no moisture absorption.

UV & abrasion ResistantExcellent resistance to abrasion and UV. For intensive outdoor use: coated variant recommended.

Chemical ExcellentResistant to salt water, acids and oil. Melting point 144–152 °C.

Our range

Types of Dyneema rope at Prorope

SK75

Dyneema SK75The versatile all-rounder

Original DSM/Avient Dyneema fibres with the highest abrasion resistance in our range. Stronger and lighter than steel. The choice for intensive use.

Highest abrasion resistanceColour: yellowIntensive winchingLifting work4x4 recovery

View SK75 rope

T70

Dyneema T70 HawklineSupple and sharply priced

The same breaking strength as SK75, but softer and more supple in construction. Easy to splice and pleasant in the hand.

Soft & suppleColour: greySailing & tackleStandard winching

View T70 Hawkline

HMPE

Prorope HMPEThe same UHMWPE performance, sharper priced

Technically almost identical to SK75: extremely high breaking strength, minimal elongation and low weight. Standard blue, on request in virtually any colour.

Best value for moneyColour: blue (custom)AgricultureIndustry

View HMPE rope

Measured breaking strengths — our own test bench (avg. of 5 tensile tests, no knot · ISO 2307:2019, measured by Otto Tromm)

Rope	Diameter	Construction	Breaking strength	≈ kg
Prorope HMPE	4 mm	12-strand braided	17,926 N	1,827 kg
HMPE white + PES sheath	5 mm	Core-sheath	10,166 N	1,036 kg
HMPE blue/gold	5 mm	Braided	9,266 N	945 kg
HMPE + PES sheath	4 mm	Core-sheath	6,698 N	683 kg
HMPE + black sheath	3 mm	Core-sheath	4,188 N	427 kg
Dyneema SK78 cord	1.5 mm	Braided, without core	2,512 N	256 kg

Note: the 5 mm kernmantel tests higher thanks to extra sheath fibres, but carries the kernmantel risk. Construction and finishing determine the end result at least as much as the fibre itself.

Our own test-bench data 2026

What Dyneema rope really does under load

Measured by Otto Tromm — 5 tensile tests per rope, Prorope test method (ISO 2307:2019). We publish the deviations too, not just the pretty numbers.

01 A knot costs up to 55% breaking strength

In the knot bend the outer fibres are loaded more heavily. A splice retains virtually the full strength — a knot loses almost half.

3 mm HMPE: 4,188 N → 1,880 N with knot (−55%)
5 mm HMPE: 9,266 N → 4,834 N with knot (−48%)

02 Pre-tensioning increases strength by 6–15%

By first putting the rope under tension the fibres align. Always pre-tension a new winch line without maximum load.

5 mm HMPE: 9,266 N un-tensioned → 10,642 N after pre-tensioning (+15%)

03 Kernmantel: sheath intact, core already broken

In 5 of 5 tests the sheath remained visually intact while the core had broken completely. A kernmantel rope can be broken internally with no visible damage.

Advice: choose a 12-strand braided construction for critical applications

04 Acoustic warning as failure approaches

Our 1.5 mm SK78 gave a cracking sound just before complete failure — in practice a warning signal.

1.5 mm SK78 measured at 2,512 N — exceptionally strong for this thin cord

05 Coating does not increase breaking strength

Counter-intuitively: our 1.5 mm with coating scored almost equal to the variant without. Choose coating for abrasion or grip — not for strength.

1.5 mm without coating: 2,512 N — with coating: 2,444 N

Comparison

Dyneema rope vs steel wire

Property	Dyneema rope	Steel cable
Weight	Up to 85% lighter	Heavy
Breaking strength	Equal or higher (by weight)	High
Buoyancy	Floats	Sinks
Snapback on break	Minimal — safer	Dangerous
Corrosion resistant	100% — will not rust	Rusts
Handling	Flexible, no splinters	Stiff, risk of wire breakage
Elongation at break	< 4%	1–2%

Conclusion: choose Dyneema rope when you need steel-wire strength without the weight, the corrosion and the safety risk — on winches, offshore and in lifting work.

Applications

Where Dyneema makes the difference

4x4 & RecoverySafer than steel thanks to minimal recoil on failure

Winch lines with hook (SK75, 6–16 mm)
Recovery lines and soft shackles

Offshore & MaritimeCorrosion-free and floating, resistant to salt water

Tow lines (up to 28 mm, hundreds of tonnes breaking strength)
Salvage systems

Sailing & Water sportsDimensionally stable and light — perfect for running and standing rigging

Halyards, sheets and trim lines
Racing lines (Liros XTR Racer)
Hawklines (T70 Hawkline)

Industry & AgricultureHigh strength-to-weight ratio, wear-resistant in all conditions

Lifting lines, tackles and safety lines
Steel-wire replacement on cranes and winches
Truck and agricultural tow lines
Livestock and machine ropes, manure scraper rope

Technical information

Specifications, points of attention & available diameters

Technical specifications

Material	UHMWPE (Ultra High Molecular Weight Polyethylene)
Specific gravity	0.98 g/cm³ — floats
Elongation at break	3–4 %
Melting point	144–152 °C
Operating temperature	Softens from approx. 125–130 °C
Water absorption	Virtually none
UV resistance	Very high
Chemical resistance	Excellent (salt, acids, oil)

Points of attention when using

1 Pre-tensioning: tension the rope first without maximum load. Our own tensile-test data shows up to +15% extra breaking strength after pre-tensioning.
2 Bend radius: avoid sharp bends — maintain a bend radius of at least 5–10× the rope diameter.
3 Temperature: prevent local overheating from friction. From 125–130 °C the material softens.
4 Termination: always finish Dyneema with a splice. A knot can cost up to 55% of the breaking strength.

Available diameters

0.8 mm 0.9 mm 1.5 mm 2 mm 3 mm 4 mm 6 mm 8 mm 10 mm 12 mm 14 mm 16 mm 28 mm

Available per metre. The 28 mm is a towing cable for offshore / heavy pulling applications.

Buy Dyneema rope at Prorope

Direct from our own stock

Prorope supplies Dyneema and HMPE directly from our own stock. Available by the metre — order exactly what you need, with no minimum order.

Ordered before 13:00 on working days = shipped the same day

Available by the metre — no minimum order

In-house splicing service — loops, eyes and custom work by specialists

Tested on our own test bench — honest breaking strengths, no marketing figures

Order Dyneema rope

Supplying consumers, water-sports users, the offshore industry and agriculture.

Need advice or a quote?

Our rope specialists are happy to help you choose the right diameter, variant or finish.
+31-77 208 6139 · info@prorope.com

Frequently asked questions

Dyneema rope FAQ

What is Dyneema rope made of?

Dyneema rope is made of UHMWPE (Ultra High Molecular Weight Polyethylene). Avient's (formerly DSM) gel-spinning process creates very long polymer chains that give the exceptional strength. Dyneema is a brand name of Avient.

What is the difference between Dyneema and Prorope HMPE?

Technically they are almost identical — both UHMWPE with comparable breaking strength, elongation and chemical resistance. Dyneema SK75 (yellow) and T70 Hawkline (grey) are the premium brand variants. Prorope HMPE offers the same performance at a sharper price, standard in blue and on request in any colour.

Does Dyneema rope float or sink?

Dyneema floats. With a specific gravity of 0.98 g/cm³ it is lighter than water and absorbs virtually no moisture — ideal for maritime and offshore applications.

How much breaking strength do I lose with a knot?

On our own test bench, 3 mm HMPE dropped from 4,188 N to 1,880 N with a knot (−55%), and 5 mm HMPE from 9,266 N to 4,834 N (−48%). Always finish Dyneema with a splice — that costs virtually no strength.

How much does Dyneema gain from pre-tensioning?

Our 5 mm HMPE broke at 9,266 N un-tensioned, but at 10,642 N after pre-tensioning (+15%). Always pre-tension a new winch line or lifting line without maximum load.

How strong is Dyneema compared to steel?

By weight, Dyneema is up to 15× stronger than steel. It weighs up to 85% less than steel wire of the same strength, does not rust, floats and does not recoil on failure the way steel does.

Is Dyneema resistant to UV and chemicals?

Yes. Dyneema has good UV resistance and excellent resistance to salt water, acids and oil. For prolonged UV exposure we recommend a coated variant or a polyester sheath.

Does a coating increase breaking strength?

No. Our 1.5 mm with coating (2,444 N) scored almost equal to the variant without (2,512 N), and the 2 mm with coating was even weaker. Choose coating for abrasion resistance or grip — not for strength.

Which diameters and colours are available?

From 0.8 mm cord to 28 mm tow lines. SK75 is standard yellow, T70 Hawkline grey, Prorope HMPE blue (virtually any colour on request). Available by the metre — ordered before 13:00 = shipped the same day.

Can kernmantel rope be broken internally with no visible damage?

Yes. In 5 of 5 tests the sheath remained visually intact while the core had broken completely. If you don't know the load history, replace the rope when in doubt. For critical applications: choose a fully braided 12-strand construction.

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