ISO 1805 Netting Yarn Breaking Force & Knot Breaking Force Test | UnitedTest Fishing Net Yarn Tensile Tester

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ISO 1805 Fishing Net Yarn Breaking Force & Knot Breaking Force Tester | UnitedTest

UnitedTest manufactures ISO 1805 tensile testing machines for fishing netting yarns, measuring breaking force and knot breaking force under dry and wet conditions. Wet knot testing simulates real marine service performance for fishing net manufacturers, aquaculture labs and fishing gear quality inspection.

ISO 1805 Fishing nets — Determination of breaking force and knot breaking force of netting yarns establishes standardized laboratory tensile test procedures to evaluate the mechanical strength of yarns used for constructing fishing nets. This standard supports both dry-condition and wet-condition tensile testing, with wet knotted yarn testing highly recommended because it best reflects how netting yarn performs underwater in actual fishing and aquaculture applications. Knot breaking force is a critical index, as knots are the weakest points of fishing nets and prone to failure under continuous water load, impact and pulling during fishing operations. This test is widely used for polyamide, polyethylene, polypropylene monofilament and multifilament netting yarns, supporting raw material incoming inspection, new yarn formulation development, finished net batch quality control, third-party certification and contract compliance verification. UnitedTest supplies reliable ISO 1805 net yarn tensile testers equipped with special anti-slip grips and wet soaking fixtures, delivering stable, repeatable breaking force and knot breaking force test results for fishing gear factories and aquaculture testing laboratories.

Test principle:

A segment of netting yarn is stretched under either dry or wet conditions until rupture occurs. A tensile apparatus records or displays the applied load during extension. Key measured outputs include maximum breaking force, rupture force, time‑to‑break, tenacity and breaking length. Wet knotted‑yarn testing is especially representative of real‑service performance of fishing net yarns.

Test equipment required for ISO 1805 Netting Yarn Breaking Force & Knot Breaking Force Test

Tensile testing machine

Recommend UnitedTest tensile testing machine

Three permissible machine types: constant‑rate‑of‑elongation (preferred), constant‑rate‑of‑load, constant‑rate‑of‑traverse.

Force indication maximum error: ≤ ±1 % within working range; dynamic calibration is required.
Minimum nominal gauge‑length capacity: 250 mm.
Equipped with specialized holding fixtures to prevent yarn slippage and clamp‑induced premature breakage for knot‑free yarn specimens.
Adjustable loading speed to achieve target time‑to‑break.

ISO 1805 Netting Yarn Breaking Force

Water‑immersion container

for pre‑soaking specimens before wet testing

Stop‑watch / interval timer

to monitor time‑to‑break of each test.

Test Specimen Information:

Specimens are taken directly from original yarn packages. Specimen handling must avoid changing yarn twist prior to conditioning or water soaking.
Two specimen categories are tested: plain (knot‑free) netting yarn; knotted netting yarn with weaver’s knot. Knots shall be manually tightened gently right before testing without altering twist. For knotted specimens, all four yarn ends of the weaver’s knot are secured into holding clamps (two ends per fixture).
Gauge length (free yarn length between two holding devices): minimum 250 mm.

Key Test Parameters

Parameter	Stipulation
Force measurement error	≤ ±1 % over used range, dynamically verified
Free gauge length	≥ 250 mm
Dry conditioning	ISO 139 equilibrium; ~24 h for man-made fibres
Wet conditioning	(20 ± 2) °C, ≥ 12 h in tap water; or 1 h with wetting agent by agreement
Mean time-to-break	(20 ± 3) s, determined by preliminary tests
Fallback time-to-break	(30 ± 3) s or (60 ± 6) s if apparatus/grips prevent 20 s; must be recorded in report
Loading rate	Not fixed numerically; adjusted to achieve the above time-to-break
Replicates	≥ 10 valid tests per package
Knot	Weaver's knot, hand-tightened, twist unchanged, break must occur at knot
Reporting units	daN (breaking force), cN/tex (tenacity), km (breaking length)

ISO 1805 Netting Yarn Breaking Force & Knot Breaking Force Test Procedures:

General procedure

Verify fixture separation meets ≥250 mm gauge‑length requirement.
Mount specimen so yarn axis aligns fully with load direction.
Apply tensile load to hit the pre‑determined average time‑to‑break.
Discard invalid tests caused by slippage or fixture‑damage breakage and document discarded count. Record cases where partial component failure happens before maximum breaking‑force is reached.

Knotted‑yarn special procedure

Make weaver’s knot and hand‑tighten just before testing, preserve yarn twist.
Fix four knot ends into two holding fixtures (two ends each side).
Reject test if fracture does not occur at the knot location.

Calculation rules

Compute mean breaking force, tenacity and breaking‑length first to four significant digits, then round to three significant digits. Statistical dispersion indicators are optional upon requirement.

Application / industry fields

ISO 1805 sits in ICS 65.150 (Fishing and fish breeding) and is used across the fishing-gear and technical-textile chain :

Netting yarn / twine producers — PA, PE, PP monofilament, multifilament, cabled and braided yarns; lot release and certificate of analysis.
Fishing-net manufacturers — gill nets, trawls, purse seines, seines, codends, aquaculture net cages; incoming-yarn QC and finished-gear design.
Independent test laboratories and inspection bodies — comparable, auditable strength data.
Buyers, procurement and certification bodies — contract specifications, supplier comparison, dispute resolution, regulatory/acceptance evidence .
R&D — comparing materials, yarn constructions, twist levels, finishes, and dry vs wet performance. A published example used SNI ISO 1805:2010 to characterise polyamide multifilament twines of different denier for purse-seine construction .

Typical uses: quality control, material selection, product development, specification/procurement, and performance verification

Related standard:

ISO 1806	Fishing nets - Determination of mesh breaking force of netting
GB/T 21292	Fishing nets Determination of mesh breaking force of netting
ISO 3790	elongation of netting yarns, tensile method: 500 mm gauge, ~30 ± 3 s, and uses the knot breaking load determined by ISO 1805 / ISO 1806 as the reference load
IS 5815-5	Textiles - Fishing nets - Determination of mesh breaking force of netting
ISO 1805	Fishing nets — Determination of breaking force and knot breaking force of netting yarns

Importance of the Test:

Fishing net yarns work under underwater, knotted loading conditions. Dry‑state breaking force alone cannot reflect actual service performance; ISO 1805 provides both dry and wet‑knotted test data that simulate real‑use loads.
Knot breaking force is a critical weak‑point indicator: knots are typical failure locations for fishing nets. This standard quantifies knot strength rather than only raw yarn strength.
It delivers repeatable, comparable laboratory tensile‑performance data for procurement, quality control and product‑design validation for fishing‑net materials.
Standardized testing rules eliminate test‑method variance between different laboratories, supporting contractual quality assessment between suppliers and buyers in fishery‑gear supply chains.

Keywords: ISO 1805 tester, fishing net yarn breaking force tester, knot breaking force test machine, netting yarn tensile tester, wet knot breaking strength test, fishing gear tensile testing equipment, aquaculture net yarn tester, PA monofilament net yarn test, polyethylene fishing net tester, polypropylene netting yarn strength test, dry and wet tensile tester for fishing yarn, fishing net material quality control, netting yarn mechanical property tester, fishing gear lab testing machine, knot strength test fixture for net yarn

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Snubbing and Capstan grips are all engineered to perform high strength tensile tests where the test samples are long compared to their cross-sectional area, such as wire, rope and strapping.

Plastic tube, wire bollard tensile test grips are used on a Universal Testing Machine to perform tensile tests on filament material such as string, thread, wire and yarn. The specimen is wrapped around a bollard or post and then secured with a vise grip mechanism.

Q1. What is ISO 1805?

A. ISO 1805:2006, Fishing nets — Determination of breaking force and knot breaking force of netting yarns, is the international test method that measures how much tensile load a fishing-net yarn can carry before it ruptures — both as a straight yarn and as a yarn tied with a knot.

Q2. What exactly does the test measure?

A. The maximum force observed during a breaking test ("breaking force"). ISO 1805 distinguishes four results: dry yarn breaking force, wet yarn breaking force, dry knot breaking force and wet knot breaking force. From the average breaking force, the standard also allows calculation of tenacity (cN/tex) and breaking length (km).

Q3. What is the difference between "breaking force" and "force at rupture"?

A. Breaking force is the maximum force reached during the test. Force at rupture is the final force at the moment the specimen, or its first component, actually breaks — at or after the maximum. They are usually, but not always, identical. In a plied or cabled netting yarn, one component may fail first, so the two values can diverge.

Q4. What are the four test configurations?

A. A 2 × 2 matrix: straight (unknotted) yarn × dry / wet, and weaver's-knotted yarn × dry / wet. The straight test characterises the yarn itself; the knotted test characterises the yarn-plus-knot system. The standard explicitly states that the wet state on the knotted yarn is particularly appropriate for indicating in-use behaviour.

Q5. What is the difference between breaking force, tenacity and breaking length?

A. Breaking force (daN) is an absolute load. Tenacity (cN/tex) divides it by the conditioned resultant linear density, so yarns of different thickness can be compared fairly. Breaking length (km) expresses the calculated length of yarn whose own conditioned weight would exert a force equal to its breaking force.

Q6. Why is the ISO 1805 test important?

A. Because the netting yarn is the load path of the whole fishing gear. Currents, towing, hauling and catch load all end up as tension in the yarn. ISO 1805 gives suppliers, net makers, buyers and test labs one reproducible number for that limit. It is used for incoming-yarn QC, lot release, material selection, product development, contract specifications and dispute resolution. Without a common method, two labs can produce two different "strengths" for the same yarn.

Q7. Why test the knot separately instead of just testing the straight yarn?

A. A knot creates a stress concentration: bending, local compression, friction and twist disturbance all act at one point. A yarn with excellent straight tensile strength can still lose a large share of it when knotted. Comparing knotted against unknotted results on the same lot reveals knot strength retention / knot efficiency — the practical "will the net hold at its junction?" question. In knotted netting, load transfer is discontinuous and concentrated at the knots, which is why yarn and knot strength are evaluated separately.

Q8. Why does ISO 1805 emphasise wet testing?

A. Fishing nets work submerged. Water changes fibre mechanical behaviour and knot friction; polyamide, for example, can lose a substantial part of its tensile strength and modulus when wet. A dry certificate can therefore overstate what the gear will actually survive at sea. That is why the wet-knotted combination is singled out as most service-relevant.

Q9. Why control "time-to-break" instead of specifying a fixed crosshead speed?

A. Netting yarns vary enormously in linear density and extensibility. A fixed speed would break a stiff monofilament in a few seconds and a stretchy multifilament much later — and loading rate affects the measured force. ISO 1805 therefore fixes the result (mean time-to-break 20 ± 3 s, set by preliminary trials) and lets the operator adjust the rate to achieve it. If the machine or grips cannot reach 20 s, 30 ± 3 s or 60 ± 6 s is allowed but must be recorded in the report.

Q10. Why must the yarn twist not be altered?

A. Twist is part of the yarn's structure and directly affects strength, elongation and knot behaviour. Clause 7 requires samples to be removed from the package without altering twist, and Clause 10.2.1 repeats the precaution when tying the knot. Untwisting or over-twisting during handling silently changes the specimen being measured.

Q11. Why must a knotted specimen break at the knot?

A. If it breaks somewhere else, the test did not measure knot breaking force — it measured the straight yarn, or a grip-induced failure. Clause 10.2.3 requires such tests to be discarded. A high rate of non-knot breaks usually points to inconsistent knot tightness, wrong knot geometry, or misaligned grips.

Q12. What is the specimen and gauge length?

A. Lengths of netting yarn taken from the package, with a free length between the holding devices of at least 250 mm. The specimen axis must be parallel to and coincident with the direction of the applied force. Yarn identification follows ISO 858 (Tex system).

Q13. Which knot is used, and how is it prepared and mounted?

A. The weaver's knot. Knots are made immediately before testing, gently tightened by hand, with precautions that the twist is not altered. All four ends are fastened in the grips; each grip holds the two ends of the same yarn of approximately the same length.

Q14. How many tests are required?

A. At least 10 single valid tests per sample package. If a confidence interval for the mean is prescribed, additional tests are run until it is achieved.

Q15. How does ISO 1805 differ from ISO 1806?

A. ISO 1805 tests the yarn (straight or knotted). ISO 1806:2002 tests the assembled mesh of the netting using pull-pins or loops. Both allow dry/wet states, ≥10 tests and a 20 ± 3 s time-to-break, but the results are not numerically comparable — mesh breaking force is lower than yarn knot breaking force. If more than half of the ISO 1806 meshes show knot slippage, that standard directs the user to ISO 1805 instead. They are complementary, not interchangeable.

Q16. Why choose ISO 1805 Fishing‑Net Yarn Breaking‑Force Testing Machine from UnitedTest?

A. UnitedTest manufactures ISO 1805:2006 compliant tensile testing machines for fishing‑net netting yarns. Test dry & wet breaking force, knot breaking force, tenacity and breaking‑length for fishery net twine. Custom bollard holding grips, full‑software report for fishing‑net manufacturers and material labs.

UnitedTest supplies complete test solutions complying with ISO 1805:2006 Fishing nets — Determination of breaking force and knot breaking force of netting yarns, for fishing‑net factories, fishery‑gear laboratories, raw‑material suppliers and third‑party inspection institutes worldwide.

Our universal tensile test systems can perform both dry‑conditioned and wet‑soaked netting‑yarn tensile tests, measuring plain‑yarn breaking force and weaver’s‑knot breaking force, calculating tenacity (cN/tex) and breaking‑length (km) as defined in ISO 1805.

✅ Core compliance features for ISO 1805 standard

Constant‑rate‑of‑elongation preferred test mode, force‑measurement error ≤ ±1 % full‑range
Support minimum 250 mm gauge‑length setup for netting‑yarn specimens
Custom‑made bollard‑type special holding fixtures (as per ISO 1805 Figure 1), prevents yarn slippage and clamp‑caused premature breakage for knot‑free and weaver’s‑knot netting twine
Real‑time monitoring and adjustment of time‑to‑break, supports target rupture‑time: 20±3 s / 30±3 s /60±6 s
Software auto‑mark invalid test events: specimen slippage, breakage in gripping zone, off‑knot fracture for knotted samples
Built‑in calculation: average breaking force, tenacity, breaking length, coefficient of variation and confidence interval
Auto‑generate full ISO 1805‑format test reports, including test conditions, wet‑soaking parameters, deviation notes for quality‑record archiving

✅ Application ScopePolyamide, polyethylene, polypropylene and other man‑made‑fibre fishing‑net netting yarn / twine; incoming raw‑material QC, R&D for new fishing‑net materials, batch release inspection, third‑party lab certification. Pair UnitedTest test machine with optional water‑immersion accessories for wet‑state ISO 1805 specimen pre‑treatment.

✅ Related‑standard supportBesides ISO 1805, UnitedTest test equipment also supports ISO 139 textile conditioning requirement, ISO 858 Tex‑system yarn‑density reference, and companion fishing‑net standard ISO 1806 for finished mesh‑breaking‑force testing.

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