ISO 1806 Fishing Net Mesh Breaking Force Test | UnitedTest Tensile Testing Machine Manufacturer

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ISO 1806 Fishing Net Mesh Breaking Force Tester | UnitedTest

ISO 1806 specifies test procedures for measuring mesh breaking force of fishing netting under dry and wet conditions. UnitedTest manufactures ISO 1806 compliant testing machines to evaluate maximum tensile load of net mesh knots and joints for fishery product quality control.

ISO 1806 sets out the standardized laboratory test method for determining the mesh breaking force of fishing netting materials. This test evaluates the maximum tensile force that an individual net mesh can sustain before failure happens at knots or connecting joints, supporting both dry‑state and wet‑state tensile testing to simulate real‑world marine service environments.

Test results from ISO 1806 deliver critical performance data for fishing net material selection, finished net product inspection, raw batch verification, and fishery gear durability assessment. It is widely adopted by net manufacturers, fishery laboratories, and marine‑gear suppliers to validate netting reliability under practical working loads.

UnitedTest develops and produces professional ISO 1806 fishing net mesh breaking force testing machines. Our equipment accurately captures tensile failure loads of net mesh knots and joints in both dry and wet testing modes, providing repeatable test data for product R&D, incoming material inspection and fishery gear compliance verification.

Test Principle

A net mesh is mounted on two holding pins or yarn loops and pulled in tension until one knot or joint reaches rupture. The machine records the maximum force during the test. Testing can be done dry or wet; wet testing is considered more representative of actual in-service net behaviour.

Key point: the result is not simply “yarn strength.” It is the strength of the mesh structure, including knot/joint geometry, twine interaction, and local stress concentration.

Specific test methods

ISO 1806 describes essentially one tensile method, with variations in condition and holding device:

Dry mesh breaking force	Sample conditioned in the standard atmosphere. Tested on pins/loops until knot or joint breaks. Result reported as dry mesh breaking force
Wet mesh breaking force	Sample fully wetted before testing. Immediately mounted and tested. Preferred for predicting use in water.
Single-mesh tensile test	Usually a single central mesh is loaded via adjacent meshes or pins. If loose ends slip in the knot, a 3 × 3 mesh specimen may be used and the central mesh strength determined.
Alternative when knots slip	If more than half the tests show knot slippage rather than knot/joint rupture, the ISO 1806 mesh method is not suitable. It is replaced by ISO 1805 knot/yarn breaking-load testing, gripping the four ends of the knot or opening surrounding knots as needed.

Test Specimen Information

Sample preparation: Trim loose yarn ends far away from knots; melting cut‑ends is preferred over cutting to prevent yarn untwisting. If knot slippage occurs during preliminary test, adopt 3×3‑mesh specimen, and test strength on the central mesh of this piece.

Test quantity: Minimum 10 valid single tests per netting batch. Extra replicates shall be added if a specified statistical confidence interval is demanded by purchaser‑supplier agreement.

Test Equipment of ISO 1806 Fishing nets mesh breaking force tension test

Universal Tensile Testing Machine (UTM)

Three allowable types: constant‑rate‑of‑elongation (preferred), constant‑rate‑of‑force, constant‑rate‑of‑traverse.

Force indication error ≤ ±1% over working range. Adjustable crosshead speed to achieve the required average time-to-break.

Pull‑pins tensile fixture

Standard clamps are replaced by stainless-steel pins standing perpendicular to the pull direction.

Pin diameter suitable for the mesh size; pin spacing adjustable for different mesh openings.

For very small meshes, use loops made from netting yarn heavier than the netting yarn instead of pins.

ISO 1806 Fishing nets mesh breaking force tension test

Auxiliary Supplies

Water immersion tank for wet testing.

Stopwatch or interval timer.

Key Test Parameters & Test Stipulations

1. Dry‑test conditioning: Follow ISO 139 standard atmosphere: 20 °C ±2 °C, relative humidity 65 % ±2 %. Man‑made‑fibre netting requires minimum 24 h conditioning to reach moisture equilibrium. Test immediately after taking samples out of conditioning chamber if in‑chamber testing is unavailable.

2. Wet‑test soaking requirement: Two soaking options:

- Tap water (no surfactant), 20 °C ±2 °C, immersion ≥12 h;

- Tap‑water solution with 1 g/L wetting agent, 20 °C ±2 °C, immersion ≥1 h.

Shorter soaking duration is permitted only if full wetting is proven. Wet samples must be tested right after being taken out of water.

3. Time‑to‑break: Mean test duration shall be 20 s ±3 s, confirmed via preliminary trial runs before formal testing.

If over half of replicates show knot slippage, this ISO 1806 mesh‑breaking‑force method is no longer applicable. Switch to ISO 1805 knot‑breaking‑load test instead.

Note: ISO 1805 knot‑break results cannot be compared numerically with ISO 1806 mesh‑break values (mesh‑breaking‑force values are always lower).

Details Test Procedures of ISO 1806 Fishing nets mesh breaking force tension test

1. Align pull‑pins or yarn loops to keep perfect parallelism to avoid angular deflection under load.

2. Mount netting specimen onto pins or loops; ensure knots do not contact pins/loops.

3. For wet specimens: start testing immediately after water immersion.

4. Apply tensile load, adjust machine speed to achieve target mean time‑to‑break (20 s ±3 s).

5. Judge test validity: discard tests with off‑knot fracture, knot slippage or joint distortion; record discard quantity and repeat with fresh samples.

6. When more than half replicates slip at knots: abandon ISO 1806 procedure and perform ISO 1805 knot‑breaking‑load test. For too‑small meshes, open surrounding knots to expose the target test knot as shown in standard Figure 3.

Industry Application

This standard applies to fishery‑industry fishing netting. Both dry and wet tests are allowed; wet‑state testing is regarded as more representative for real‑service marine‑water working conditions of fishing nets.

Commercial fishing nets: trawl, seine, gillnet, purse seine

Aquaculture and fish-farming cages and containment nets

Netting manufacturing and quality control

Fishing-gear design and R&D

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
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

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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.

Fishing Nets Mesh Break force tension test fixture confirm the ISO 1806, use to check the mechanical strength of fishing net mesh. ISO 1806 specifies a method of determining the mesh-breaking force of netting for fishing.

Q1: What is ISO 1806 test used for, and why is it important for fishing net materials?

A: ISO 1806 measures mesh breaking force of fishing netting, evaluating how much tensile force a complete net mesh (knot/joint assembly) can withstand before rupture. It is critical because real‑world net failure mostly occurs at mesh knots instead of raw yarn breakage. Dry‑state and wet‑state test data support quality control, buyer‑supplier acceptance, product design, and predict in‑service underwater performance. Bad mesh strength may cause net breakage, lost fishing gear, marine ghost‑gear pollution and economic loss.

Q2: What is the difference between dry mesh breaking force and wet mesh breaking force in ISO 1806?

A: Dry mesh breaking force is maximum rupture force measured after specimens are conditioned under standard textile atmosphere (20 °C ±2 °C, RH 65 % ±2 %). Wet mesh breaking force is tested after full water immersion. ISO 1806 highlights wet‑state test is more representative for actual marine working conditions of fishing nets, as water will change knot friction and fibre mechanical behaviour underwater.

Q3: What is “time‑to‑break” in ISO 1806, and what is the required value?

A: Time‑to‑break is the time (seconds) from force application until mesh rupture. The required average time‑to‑break for valid tests is 20 s ±3 s. Operators need to run preliminary trials to adjust machine speed to hit this target time window; test results will deviate if breaking is too fast or too slow.

Q4: How many test specimens are required for ISO 1806 mesh breaking force test?

A: Minimum 10 valid single mesh tests for one netting batch. If purchaser‑supplier contract requires defined statistical confidence interval, extra replicates shall be added to meet statistical requirements. Invalid tests (knot slip, off‑knot breakage) must be discarded and recorded, then retested with new samples.

Q5: What causes invalid test results in ISO 1806 testing?

A: Three main invalid scenarios:

1. Specimen breaks outside knot/joint (yarn body breaks, not knot).

2. Loose yarn tails slip inside knots, or net joints deform before rupture.

3. Mis‑aligned pins/loops generate side angular load on mesh.

All invalid runs shall be discarded, counted in test report, and retested with fresh samples.

Q6: More than half my test samples show knot slippage. Can I keep running ISO 1806?

A: No. If >50 % replicates suffer knot slippage, ISO 1806 mesh‑breaking‑force procedure is not applicable. You must switch to ISO 1805 (test knot breaking load of netting yarns). Important note: ISO 1805 knot‑break results cannot be numerically compared with ISO 1806 mesh‑breaking‑force values; mesh breaking force from ISO 1806 is always lower than knot breaking load from ISO 1805.

Q7: What special fixtures are required instead of standard tensile clamps for ISO 1806?

A: Ordinary flat clamps cannot be used. You need stainless‑steel pull‑pins perpendicular to pulling direction, or heavy‑duty net yarn loops (for very small meshes). Pin spacing must be adjustable for different mesh sizes. Ensure knots do not touch pins/loops during mounting, and pins/loops stay parallel to avoid side load deflection.

Q8. Dry test or wet test — which is better?

A: Both are allowed. Wet testing is considered more representative of actual fishing-net service because nets work in water, often under dynamic load and biofouling conditions. Dry testing is used for standard conditioning, routine QC, and comparison purposes.

Q9. Why not just test the yarn?

A: Yarn strength does not include knot stress concentration, mesh geometry, twist/braid configuration, or slippage. ISO 1806 gives a structure-level strength value that is usually lower than yarn/knot-only strength and more relevant to service failure.

Q10: Why choose ISO 1806 Fishing Net Mesh Breaking Force Tester | UnitedTest Manufacturer?

A: UnitedTest designs and manufactures precision tensile and universal testing machines for metals, textiles, polymers, geosynthetics, and specialized netting products. For fishing-net evaluation, UnitedTest provides ISO 1806-compatible mesh breaking force test solutions: a CRE/UTM base machine combined with stainless-steel pin holders or heavier netting-yarn loop holders, adjustable mesh spacing, high-accuracy load measurement, and software for force–time and force–displacement recording.

The ISO 1806 method measures the maximum force at which a net mesh fails at a knot or joint under tensile load. UnitedTest systems support both dry conditioning per ISO 139 and wet-state testing, with crosshead-speed control tuned to the standard 20 s ± 3 s mean time-to-break. Load-cell accuracy, closed-loop servo control, and quick-change fixtures make the equipment suitable for net manufacturers, fishery-gear QC labs, third-party inspection bodies, and R&D centers.

Our testing machines support three allowed loading modes (constant‑rate‑of‑elongation, constant‑rate‑of‑force, constant‑rate‑of‑traverse). Force measurement accuracy ≤ ±1 % across working range, enables precise control of average time‑to‑break at 20 s ±3 s as required by ISO 1806 standard. The system automatically records peak breaking force in decanewton (daN), calculates average value, coefficient of variation and statistical confidence interval, and generates ISO‑1806‑compliant test reports.

If excessive knot slippage occurs during mesh test, UnitedTest equipment also supports switching to ISO 1805 knot‑breaking‑load test method with alternative grip sets, helping your lab handle both ISO 1806 and ISO 1805 fishing‑net‑testing workflows.

Key Features for ISO 1806 Test:

✅ Custom‑made ISO 1806 fixtures: stainless‑steel pins / loops for small‑to‑large net meshes

✅ Real‑time force‑time curve recording, monitor time‑to‑break parameter

✅ Support dry‑condition conditioned specimens & post‑immersion wet‑net‑specimen testing

✅ Automatic mark invalid test runs (knot slip, off‑knot fracture)

✅ Export complete test report matching ISO 1806 report‑writing requirements

✅ Lab‑calibrated force accuracy, suitable for ISO 17025 accredited testing laboratories

Contact UnitedTest for quotation and technical datasheet for ISO 1806 fishing‑net‑mesh‑breaking‑force test setup.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you