ISO 11296‑3:2018 | Close‑Fit Lining Pipe Standard, Mechanical & Pressure‑Related Testing Guide

Information on the most widely used ASTM standards within the materials testing industry

Descriptions of the most prominent lSO standards within the materials testing industry

Standards including EN, DIN, JlS, and more

Mechanical testing of polymer materials in the automotive industry is directly related to the safety of components and the reliability of the entire vehicle. UnitedTest can cover mechanical performance testing for automotive interior and exterior parts, as well as functional components, adapting to automaker standards and providing comprehensive testing solutions including tensile, impact, and fatigue tests.

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Mechanical testing in the consumer goods industry determines product durability and safety, such as impact resistance for toys and fatigue resistance for home appliances, making it core to compliance and quality. UnitedTest can cover mechanical tests for all categories of consumer goods, including tensile, impact, and hardness tests, compatible with national and international standards, and offers customized testing solutions.

In the field of medical and biomedical sciences, mechanical testing determines the safety and compatibility of implanted devices and biomaterials, making it a core part of regulatory approval. UnitedTest can cover a full range of tests including tensile, fatigue, and wear tests, compatible with national and international standards, and provides customized biomechanical testing solutions.

Material strength is a course that most engineering fields are required to study in university education. This interesting course is very practical and makes use of testing equipment in the materials laboratory.

Mechanical testing of industrial products and components is essential to ensure their load-bearing, fatigue resistance, and impact resistance, directly preventing production accidents and ensuring stable operation of equipment. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, complying with national and international standards, and provides customized industrial mechanical testing solutions.

Mechanical testing in the plastic pipe industry determines ring stiffness, impact resistance, and tensile performance, directly preventing pipe bursts and deformation risks. UnitedTest can cover full-dimensional mechanical testing of pipes, complies with ISO,ASTM,EN et.c, international standards, and provides customized testing solutions.

In the construction engineering and building materials industry, mechanical testing determines the compressive and tensile properties of materials such as concrete and steel, which is core to ensuring the safety and durability of buildings. UnitedTest can cover the full range of building material mechanical tests, complies with ISO, ASTM international standards, and provides customized testing solutions for compressive, tensile, and other properties.

Mechanical testing in the food and beverage industry involves the compressive and tensile performance of packaging and the safety of food texture, directly ensuring storage, transportation safety, and the eating experience. UnitedTest can cover all-dimensional mechanical testing for packaging and food texture, comply with national and international standards, and provide customized testing solutions.

Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

Metallurgical testing examines the properties of metallic materials to determine if a particular metal is appropriate for its intended use.

Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

UnitedTest offer world-class testing solution in testing for polymeric materials, including elastomers, thermoplastics, composites, coatings, and structural adhesives in a variety of industries.

Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

Conduct adhesive testing using various testing methods to determine their performance and characteristics in applications across multiple industries such as aerospace, automotive, construction, packaging, industrial, medical, and energy, thereby supporting application development and quality assurance.

UnitedTest supply machine and testing solution for tension, compression, fracture toughness, direct shear, triaxial and ultrasonic velocity are common concrete and rock testing applications.

UnitedTest has helped a number of companies involved in the wood, paper, cardboard, and corrugated industry with their testing needs. Our materials testing systems are capable of testing raw materials, components, and finished products.

UnitedTest testing system is trusted by leading medical device manufacturers, universities, and medical research laboratories worldwide. Whether testing tissues or bioresorbable materials, stents, or sutures, UnitedTest offers a variety of single-actuator and dual-actuator systems to meet your biomedical testing needs.

Mechanical testing in the textile fabric industry determines core properties such as fabric tensile strength, tear resistance, and wear resistance, directly affecting product durability and safety. UnitedTest can cover comprehensive mechanical tests for textiles, complying with national standards / ISO standards, and provides customized testing solutions including tensile, tear, and puncture tests.

The mechanical testing of industrial components directly determines the load-bearing, fatigue resistance, and wear resistance of the parts, helping to avoid equipment failure risks. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, is compatible with ISO/ASTM/GB standards, and provides customized mechanical testing solutions for industrial components.

Mechanical testing in the glass-ceramics industry determines core properties such as flexural strength, hardness, and fracture toughness, directly helping to avoid brittleness and failure risks. UnitedTest can cover comprehensive testing for flexural strength, hardness, and fracture toughness, compatible with national and ISO/ASTM standards, and provides customized testing solutions.

Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

Fatigue Test assesses material durability under cyclic loading, critical for predicting service life of industrial components. UnitedTest offers fatigue testing systems (axial/bending/torsion) compliant with ASTM E466/ISO 12106, providing tailored solutions for automotive, aerospace and manufacturing sectors.

Peel Test measures material adhesion strength by evaluating resistance to peeling forces, critical for adhesives, films, packaging. UnitedTest offers peel testers compliant with ASTM D903/ISO 8510, covering 90°/180° peel tests, and tailored solutions for packaging, automotive, textile industries.

Impact Test evaluates material resistance to sudden shock loads, critical for assessing toughness and fracture risk. UnitedTest offers impact testers (Charpy/Izod/fall weight) compliant with ASTM E23/ISO 148, providing tailored solutions for metals, plastics, glass and industrial components.

Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

Hardness test measures material's resistance to permanent indentation, critical for quality control. UnitedTest offers universal hardness testers (Rockwell/Brinell/Vickers) compliant with ASTM/ISO standards, plus tailored hardness testing solutions for diverse industrial needs.

Biaxial/triaxial tests evaluate material performance under multi-axis loads, critical for biomaterials, metals and composites. UnitedTest provides compliant testing machines (ASTM/ISO) for planar biaxial, static/fatigue triaxial tests, with tailored solutions for industrial & biomedical needs.

Friction and wear tests assess material resistance to friction, abrasion and wear, critical for industrial material performance validation. UnitedTest offers tribometers compliant with ASTM G99/ISO standards, covering pin-on-disk, four-ball tests, and tailored friction & wear testing solutions for diverse industries.

Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

Fire test assesses material flammability, heat resistance and fire-retardant performance, critical for safety compliance across industries. UnitedTest offers fire testing equipment compliant with ASTM/ISO/UL standards, providing tailored fire test solutions for building materials, plastics and industrial components.

Non-destructive Test (NDT) evaluates material/component integrity without damage, critical for safety & quality across industries. UnitedTest offers ultrasonic/X-ray/magnetic particle NDT equipment compliant with ASTM/ISO standards, plus tailored NDT solutions for aerospace, automotive & manufacturing sectors.

ISO 11296‑3 Plastics piping systems for renovation of underground non‑pressure drainage and sewerage networks — Part 3: Lining with close‑fit pipes

ISO 11296-3 explained: close-fit pipe lining testing — ring stiffness (ISO 9969), creep ratio (ISO 9967), tensile (ISO 6259-1) and hydrostatic pressure (ISO 1167).

Learn ISO 11296‑3:2018 requirements for PE / PVC‑U close‑fit rehabilitation liners, mechanical tests, sampling, equipment, referenced standards and industry application for underground non‑pressure sewer renovation.

Core definition: Close‑fit pipe

A continuous thermoplastic liner pipe that is mechanically reshaped (folded / reduced cross‑section) before pulling into the host old sewer pipe. After insertion, it reforms / reverts back to circular geometry to achieve interference fit or minimal annular gap against inner wall of existing host pipe.

Material scope

Covers PE (polyethylene) and PVC‑U (unplasticized polyvinyl chloride, including modified PVC‑U for lining) pipes and fittings for gravity non‑pressure sewer renovation. It defines two product stages:

M‑stage: Manufactured‑as‑produced pipe condition (factory output before site installation).
I‑stage: Installed‑in‑situ lining system after on‑site re‑forming / heat‑reversion.

Important note: ISO 11296‑3:2018 applies to NON‑PRESSURE gravity sewer networks only. For pressurized sewer close‑fit lining, you should refer to ISO 11297‑3; for drinking‑water close‑fit liners refer to ISO 11298‑3iteh.eu. This standard does NOT contain burning / fire resistance test clauses; fire performance shall follow separate building‑fire related ISO standards.

Industry application fields

Trenchless rehabilitation of aged underground municipal gravity sewer, storm‑water drainage pipelines
Civil infrastructure renewal, municipal pipe rehabilitation contractors, plastic pipe liner manufacturers, third‑party testing laboratories, certification bodies
Quality verification for factory‑folded PE close‑fit liners, reduced‑diameter PVC‑U close‑fit liners and butt‑fusion welded joints

Why this standard is critical for lining materials

Traditional plastic pipe standards only test finished pipes at factory (M‑stage). Close‑fit liners undergo heavy mechanical deformation (folding, pulling, reshaping) during installation, which may induce crazing, residual stress, wall‑thickness unevenness, and loss of ring stiffness. ISO11296‑3 requires performance verification after simulated or real installation (I‑stage) rather than only raw pipe test results, ensuring the liner can resist long‑term external groundwater buckling, soil load and joint failure under real underground service environment

Major Mechanical & Pressure‑related Tests Specified in ISO 11296-3

1, Ring Stiffness Test for Installed Liner	Evaluate the liner’s ability to resist external soil and groundwater buckling load after installation, core mechanical index for gravity plastic liners.
Test standard	ISO 9969
Test Equipment	Ring stiffness compression testing machine (universal compression tester equipped with parallel flat loading plates, displacement & force data acquisition). UnitedTest ring‑stiffness testing system can meet ISO 9969 execution requirements.
Test Stipulation	PE installed liner: declared ring stiffness value ≥ 1.0 kPa. PVC‑U installed liner: ring stiffness is derived from declared tensile E‑modulus and SDR dimension ratio.
Test Specimen info	Pipe ring specimens cut from real installed liner or simulated‑installation test piece (I‑stage condition after full reversion). Sample sampling complies with ISO11296‑1.
Test Procedure	Place short pipe ring horizontally between two parallel rigid plates, apply continuous vertical compressive load, record force‑deformation curve and calculate ring stiffness value.
2, Creep Ratio Test	Measure long‑term time‑dependent deformation under sustained external load, critical for predicting 50‑year service‑life anti‑buckling performance under underground sustained groundwater pressure.
Test standard	ISO 9967
Test Equipment	Same ring‑compression loading frame as ring‑stiffness test, displacement logging, visual‑inspection setup. Thermoplastic pipe creep ratio testing apparatus with long‑term static load fixture, environmental temperature‑controlled chamber, automatic deformation recording unit.
Test Stipulation	PE liner: declared creep ratio ≤ 4.0 Standard PVC‑U liner: creep ratio ≤ 2.5 Modified PVC‑U liner: creep ratio ≤4.0
Test Specimen info	Installed‑state pipe ring sample (I‑stage from real / simulated installation).
Test Procedure	Apply constant static diametral deflection load on pipe ring; record deflection development over testing period and compute creep ratio.
3, Tensile Property Tests	Verify tensile performance does not degrade excessively after folding / installation deformation; prevent crazing and through‑wall cracking risk for folded liners.
Test standard	ISO 10471
Test Equipment	Universal tensile testing machine (UnitedTest electronic universal tester for plastics).
Test Stipulation	PE raw pipe (M‑stage): yield tensile stress >15 MPa; elongation at break >350 % (ISO6259‑1, ISO527‑2). PVC‑U raw pipe (M‑stage): tensile strength ≥ 20 MPa; tensile E‑modulus ≥1200 MPa; elongation at break ≥70 %. Installed PVC‑U liner (I‑stage): longitudinal tensile strength shall not drop below M‑stage declared value.
Test Specimen info	Type 1B dumb‑bell tensile specimens machined from pipe wall.
Cross‑head test speed	PE pipe tensile: 100 mm/min (yield), 25 mm/min (elongation‑at‑break) PVC‑U pipe tensile: (5 ±0.5) mm/min
4, Butt‑fusion Joint Tensile Failure‑Mode Test for PE pipe joints	Verify fusion joint quality for site‑welded PE liner strings.
Test standard	ISO 13953 (PE pipes & fittings‑Tensile strength & failure mode test for butt‑fusion joints).
Test Equipment	Universal tensile test machine.
Test Stipulation	Joint shall show ductile failure mode (no brittle fracture on fusion weld interface). Butt‑fusion shall NOT be performed on folded pipe before heat‑reversion
Test Specimen info	Test pieces cut from site‑simulated butt‑fusion joint.
5, Memory‑ability Test	Verify shape‑memory recovery performance of factory‑folded PE liner; confirm pipe can return close‑to‑original circular shape upon heating after pulling into host pipe.
Test Equipment	Hot‑air circulating oven stable at (120 ± 2) °C, caliper dimension measuring tool.
Test Stipulation	PE80: After heating recovery: residual minimum height H ≥0.75 × original manufactured outer diameter dₘₐₙᵤբ PE100: H ≥0.65 × dₘₐₙᵤբ
Test Specimen info	Minimum length 50 mm cross‑section segments from factory‑folded PE pipe.
Test Procedure	Conditioning oven at 120 °C, put folded pipe sample inside; heating duration depends on wall‑thickness: ≤8 mm:60 min; 8‑16 mm:90 min; >16 mm:120 min. Cool sample down to near ambient temperature, measure minimum cross‑section dimension H and compare against original circular diameter before folding.
6, Resistance to internal pressure (hydrostatic pressure)	For PE, requires "resistance to internal pressure (long-term behaviour)" to be verified per ISO 8772, which calls up the ISO 1167 method. This is the classic hydrostatic pressure (long-term hydrostatic strength) test on pipe.
Test Equipment	Hydrostatic pressure testing machine Pressure-generating and pressure-regulating unit (pump/intensifier, accumulator, precision pressure transducer, safety enclosure). Conditioning bath or cabinet with circulating, temperature-controlled water (typically ± 1 °C) and pre-heated water fill. End-cap sets (type A and/or B) for the diameter range, venting valves, multi-station manifold, timer with ± 0.5 % accuracy, burst/no-burst detection and automatic shut-off, plus data logging of pressure, temperature and time-to-failure.
Test Standard	ISO 1167, ISO 8772
Test Specimen info	Pipe section with end caps; free length between end caps ≥ 3 dₙ and ≥ 250 mm; for dₙ > 315 mm the free length may be reduced to 2 dₙ. Standard thermoplastic pipe test pieces; conditioned and tested at the temperature fixed by the referring standard (commonly 20 °C, 23 °C, 60 °C or 80 °C).
Other Test	Vicat softening temperature test for PVC‑U (ISO2507‑1) Dichloromethane resistance test for PVC‑U gelation check (ISO9852) Longitudinal reversion test for PE and PVC‑U pipe DSC (Oxygen induction test) test for modified PVC‑U (ISO18373‑1‑2007) Impact resistance (PVC-U) ISO 4435 Melt Flow Index Test ISO 1133

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pipe ring stiffness test machine is used to determine the ring stiffness of circular cross-section thermoplastic pipes, according customer’s request, it can also execute compression, ring stiffness, ring softness and creep ratio test.

Elevate your pipeline testing with our advanced hydrostatic pressure testing machine, designed per ISO 1167, ASTM D1598, and ASTM D1599 standards. Perfect for evaluating the durability of plastic and compound pipelines like PP-R, PVC, and PE, it applies precise constant or rapid hydraulic pressure, ensuring reliable performance.

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.

Extrusion Plastometer is for melt mass-flow rate (MFR) and the melt volume-flow rate (MVR),to measure the melt mass flow rate of thermoplastic plastics under specific temperatures and pressures, reflecting the flow performance of materials through standardized testing.

Charpy & Izod Integrated Impact Tester combine the Charpy and IZOD two impact method in one machine, include the full IZOD and Charpy test energy, simply change pendulum and vice, in one machine meet user multiple test requirement, enhance the working efficiency.

Heat Distortion Temperature Tester for accurate measurement of plastic materials’ heat deflection under load, ensuring reliable thermal performance evaluation, quality control, and compliance with international standards.

Pipe Size Change Measuring Tester/ Longitudinal Reversion Tester suitable to measure various kinds of plastic pipe or plastic materials size change after heating, or used to heat the test sample. It can be used as a heating oven as well.

Oxidative Induction Time testing machine is kind of differential scanning calorimeter,, check the relation of temperature with the rate differential input in test sample and reference articles. used to do Oxidative Induction Time test, heat stability, glass transition temperature, melting point.

Methylene chloride tester/Dichloromethane soak testing machine is used to determine the resistance of unplasticised polyvinyl chloride (PVC-U) pipes to dichloromethane (methylene chloride) at a specified temperature (DCMT).

UnitedTest Pipe Apparent Hoop Tensile Testing Machine complies with ASTM D2290, specialized in testing apparent hoop tensile strength of plastic and reinforced plastic pipes. It uses a self-aligning split disk fixture to apply tensile stress to pipe ring samples along their contour.

Hoop tensile strength of plastic pipes is designed based on the ASTM D2290, to determine the breaking strength for the pipe hoop tensile test. ASTM D2290 is a test method used to study the apparent tensile strength of plastic pipes using a specialized test fixture to pull apart a ring of pipe.

Area	Standards
System / general	ISO 11296-1 (General), ISO 11295 (classification and design), ISO 11297 (pressure drainage), ISO 11298 (water supply), ISO 11299 (gas)
Successor standards	ISO 11300-1:2026 (PE), ISO 11300-2 (thermosetting composites), ISO 11300-3:2026 (PVC-U, close-fit), ISO 11300-4 (thermoplastic composites); ISO/TS 23818-3 for conformity assessment
Materials	ISO 8772 (PE buried non-pressure), ISO 4435 (PVC-U buried non-pressure), ISO 4427 series (PE water supply)
Mechanical	ISO 9969 (ring stiffness) ISO 9967 (creep ratio), ISO 13968 (ring flexibility), ISO 6259-1 (tensile), ISO 527-2 (test pieces), ISO 13953 (butt fusion joint tensile), ISO 5893 / ISO 7500-1 / ISO 9513 (machine requirements)
Pressure	ISO 1167-1 / -2 (internal pressure resistance), ISO 9080 (long-term strength extrapolation), ISO 12162 (classification, MRS, design coefficient)
Physical / chemical	ISO 2507-1 (Vicat), ISO 9852 (DCMT), ISO 18373-1 (DSC), ISO 11357-6 (OIT), ISO 1133-1 (MFR), ISO 1183-1 (density), ISO 2505 (longitudinal reversion)
Dimensions / installation	ISO 3126 (dimensions), ISO 12176-1 (butt fusion equipment), ISO 12176-2 (electrofusion equipment), ISO 4427-3 (electrofusion fittings)
Fire (adjacent markets)	EN 13501-1, EN ISO 11925-2, UL 94 / IEC 60695-11-10, ISO 9772, ISO 9773, ISO 4589-2/-3, ISO 5660-1, ISO 871

Main mechanical tests referenced by the standard

Test	Standard	Key parameters
Tensile properties of pipes	ISO 6259-1	Test piece type 1 = ISO 527-2 type 1B (150 mm long, 10 mm narrow parallel width, 50 mm gauge length); die-cut for wall thickness < 12 mm, machined above; machine per ISO 5893, force per ISO 7500-1, extensometer per ISO 9513; conditioning (23 ± 2) °C; speeds as required by the referring table (5, 25 or 100 mm/min)
Butt fusion joint tensile	ISO 13953	5 mm/min ± 1; type A/B test pieces; number of test pieces per dn; condition ≥ 6 h at (23 ± 2) °C; test ≥ 24 h after fusion; record ductile vs brittle failure
Impact resistance (PVC-U)	ISO 4435	Per the material standard
Dimensions	ISO 3126	(23 ± 2) °C
Vicat softening temperature	ISO 2507-1	PVC-U
Dichloromethane resistance	ISO 9852	30 min, no attack
DSC (alternative to DCMT)	ISO 18373-1	Melting onset ≥ 185 °C
Memory ability of factory-folded PE	Annex A of ISO 11296-3	Normative annex