ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

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ISO 8513 GRP FRP Pipe Longitudinal Tensile Strength Tester | UnitedTest

UnitedTest manufactures precision ISO 8513-compliant universal tensile testing machines engineered for glass-reinforced thermosetting plastic (GRP / FRP) pipe manufacturers, pipeline engineering labs and third-party plastic piping certification facilities. Our test equipment fully supports standardized specimen clamping and tensile loading workflows defined by ISO 8513 for longitudinal mechanical property evaluation of fiberglass pipe walls.

ISO 8513 Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength establishes a standardized tensile loading procedure to quantify two key longitudinal mechanical indicators of GRP / FRP pipeline materials: initial longitudinal tensile strength and percentage ultimate elongation at break.

This standard exclusively focuses on measuring tensile breaking force and fracture elongation of GRP pipe specimens. It clearly excludes longitudinal tensile modulus testing from its scope. The multi-layer composite wall construction of GRP pipes creates inconsistent strain distribution across the pipe cross-section, which prevents accurate, reliable strain measurement required for valid modulus calculation.

Test data generated by UnitedTest’s ISO 8513 tensile testers enables pipeline producers to verify fiberglass resin formulation performance, control winding layer consistency during pipe extrusion and filament winding production, validate pipe structural compliance for water, sewage and industrial fluid piping projects, and conduct batch quality inspection of finished GRP pipeline products.

Test Principle

A GRP specimen (strip or full pipe section) is mounted axially in the tensile machine.

Cross-heads separate at a constant low speed to apply uniform longitudinal tensile load until specimen fracture occurs within a reasonable test duration.

Record two key raw data sets throughout loading:

Maximum breaking tensile force (F, N)

Cross-head displacement at fracture (to compute ultimate elongation percentage)

Two Specific Test Methods & Application Scope

Method A: Longitudinal Strip Specimen Test

Specimen form: Rectangular parallel-sided strip or dumbbell-shaped strip cut longitudinally from the GRP pipe wall

Applicable pipe types & nominal diameters (DN):

Circumferentially wound GRP pipes (with chopped glass, woven rovings or fillers), centrifugally cast GRP pipes: DN ≥ 50

Helically filament-wound GRP pipes: DN ≥ 200

Typical usage: Large-diameter GRP pipes above DN150/DN200 where full-pipe-section testing (Method B) exceeds tensile machine load capacity

ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

Method B: Full Pipe Section Test

Specimen form: Complete uncut GRP pipe segment retaining full circular cross-section

Applicable pipe types: All GRP pipe manufacturing types (circumferential, helical winding, centrifugal casting); primary use for DN ≤ 150 small/medium GRP pipes

ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

Test Specimen

Method A — Strip specimen

Length: 300 ± 15 mm.

Two shape options:

Shaped (dumbbell) strip — gauge length lG = 100–150 mm, radius R = 50–70 mm, gauge width bG = 10 ± 1 mm (DN ≤ 150) or 25 ± 1 mm (DN > 150); total width b = 18 ± 2 mm (DN ≤ 150) or 40 ± 2 mm (DN > 150).

Parallel‑sided (rectangular) strip — gauge width bG = 10 ± 1 mm (DN ≤ 150) or 25 ± 1 mm (DN > 150); the gauge length is the non‑built‑up area between the grips.

For thick‑wall pipes, widths may be reduced to fit the testing machine capacity (this yields a more conservative strength indication).

Built‑up ends (optional, per 2023 edition): the grip ends may be thickened with a thermosetting resin (with or without reinforcement), then machined flat and parallel so that the centroid of the gauge‑length cross‑section lies on the machine's loading centreline.

Method B — Pipe‑section specimen

Full pipe section, minimum length 450 mm.

Internal core support may be used for thin‑walled pipes to prevent buckling.

Metallic tabs (e.g., aluminium pipe sections) bonded with glass‑fibre fabric tape and thermosetting resin can reinforce the grip zone.

Test Equipment of ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

Universal Testing Machine (UTM)

Constant-rate cross-head tensile testing machine

Fixed/moving cross-head with aligned grips to ensure specimen longitudinal axis matches tensile load direction, no lateral offset

Continuous, adjustable constant cross-head travel speed (2–5 mm/min for all tests)

Force measurement system with ≤ ±1% full-scale accuracy, low inertia lag to record peak fracture force (in Newtons)

Cross-head displacement tracking to calculate ultimate elongation.

Specialized Grips

For Method A strip samples: Flat clamping grips; manufacturers may build-up specimen ends with reinforced thermoset resin to prevent crushing/slippage

For Method B full pipe segments: Segmented wedge grips matched with internal mandrels; thin-wall pipes require metal reinforcing bands around gripped zones

Grip requirement: Zero slip, no localized crushing that invalidates tensile failure results.

Mandatory Test Parameters & Stipulations:

Loading rate	Constant cross‑head speed of 2–5 mm/min.
Force recording	Record forces and corresponding elongations at appropriate intervals; capture the maximum force in newtons.
Specimen alignment	Axial alignment must coincide with the pull direction; grips tightened uniformly to prevent slip.
Rejected tests	Discard specimens that slipped in the grips or ruptured outside the gauge length; repeat with replacement specimens. (If such failures do occur, they may be included if the resulting average strength increases.)
Measurements	- Method A: wall thickness e and widths b and b_G at the centre of the gauge length, to nearest 0.1 mm. - Method B: internal or external diameter and average wall thickness (three measurements equally spaced around the circumference at both ends).
Ultimate elongation	Calculated for each specimen and averaged across all specimens.

Step-by-Step Test Procedure of ISO 8513 Longitudinal tensile test for Glass-reinforced thermosetting plastic pipe

Pre-test dimension measurement

Method A: Measure wall thickness e, gauge width b_G at the exact center of the specimen gauge length (0.1 mm precision)

Method B: Measure internal/external diameter and wall thickness at three equally spaced circumferential positions on both pipe ends to calculate average wall thickness and mean diameter d_m

Specimen mounting & alignment

Insert specimen into machine grips, adjust clamping force uniformly to eliminate axial misalignment and prevent slippage during tension.

Controlled tensile loading

Activate cross-head movement at 2–5 mm/min constant speed; continuously log applied force and cross-head displacement data at regular intervals until full fracture. Record the absolute maximum tensile force sustained before breakage.

Invalid specimen screening & retesting

Remove slipped specimens and samples fractured outside gauge length, prepare new identical specimens and repeat full test sequence.

Post-test data computation

Calculate individual and average longitudinal tensile strength, individual and average percentage ultimate elongation, plus standard deviation of results if required.

Industry Fields & Applications

GRP pipes are widely used where corrosion resistance, light weight, and high specific strength are essential. The ISO 8513 test serves the following industries:

Water & wastewater: potable water transmission, municipal/industrial sewage systems, irrigation.

Marine & offshore: seawater flood, injection, and disposal lines; cooling‑water intake.

Oil & gas: natural gas lines up to 8.3 MPa / 66 °C; process flow lines.

Chemical processing: pumping of corrosive liquids and slurries (especially GRE — glass‑reinforced epoxy — pipes).

Fire extinguishing systems.

Power generation: cooling‑tower water intake, plant process piping.

Infrastructure: buried pipelines, thrust‑block design at bends and fittings, anchorage for underwater installation.

In design codes like EN 1796, initial longitudinal tensile strength is a mandatory property — it governs two design cases: (a) pipes that must resist internal pressure acting on a closed end, and (b) pipes that need not resist such pressure. The short‑term safety factor for case (a) is about 2.8. Hence, ISO 8513 data directly feeds into product specification, quality control, and structural design of GRP piping systems.

Related Test Standard:

ISO 8513	Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength
EN 1393	Glass-reinforced thermosetting plastics (GRP) pipes - Determination of initial longitudinal tensile properties
JIS K 7033	Plastics piping systems -- Pipes made of glass-reinforced thermosetting plastics (GRP) -- Determination of initial tensile properties
ASTM D2105	Standard Test Method for Longitudinal Tensile Properties of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Tube
ISO 527-4/ISO 527-5	Plastics – Tensile properties – Part 4: Test conditions for isotropic/orthotropic fiber-reinforced plastic composites Plastics – Tensile properties – Part 5: Test conditions for unidirectional fiber-reinforced plastic composites
EN 1796	European product standard for GRP pipes that cites initial longitudinal tensile strength requirements; design basis for safety factors.

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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.

Hydraulic wedge test grips are a robust and versatile solution for tensile testing of high-strength materials. It can be used in both static and dynamic materials testing applications – from 20KN to 500 kN force capacity for dynamic tests, and up to 600 kN for static tests.

Purpose-built for longitudinal tensile testing of reinforced thermosetting plastic pipe (RTRP) and reinforced polymer mortar pipe (RPMP). Adopting the internal mandrel and segmented split collet clamping configuration specified in ASTM D2105, this modular fixture ensures uniform circumferential.

ISO 8513 Tensile Testing Machine & GRP Pipe Longitudinal Tensile Test Solutions by UnitedTest

UnitedTest is a leading manufacturer of universal tensile testing machines and specialized fixtures for ISO 8513 — the international standard for determining the initial longitudinal tensile strength of glass-reinforced thermosetting plastics (GRP) pipes. Whether you are a GRP pipe producer, a third-party laboratory, or a water/wastewater engineering company, UnitedTest delivers turnkey testing systems that fully comply with the apparatus and procedure requirements of ISO 8513.

Q1: What is ISO 8513? Why is this test critical for GRP pipes?

A1: ISO 8513 defines two standardized test methods to measure initial longitudinal tensile strength (N/mm circumference) and ultimate elongation (%) of glass-reinforced thermosetting plastic (GRP/FRP) pipes.

This test is indispensable for three core reasons:

Pipeline structural safety: Buried GRP pipes bear axial loads from soil settlement, thermal expansion, bending and internal fluid pressure. Insufficient longitudinal tensile strength causes pipe cracking, rupture or pipeline collapse.

Manufacturing QC control: Variations in glass fiber winding angle, resin curing, fiber content or wall thickness directly reduce tensile performance; ISO 8513 testing identifies defective pipes before delivery.

Global compliance certification: Municipal drainage, chemical, oil & gas pipeline projects worldwide require ISO 8513 test reports as mandatory acceptance documentation.

Q2: What two test methods does ISO 8513 specify, and how do I choose Method A vs Method B?

A2: Method A (Strip Specimen Test): Cut longitudinal dumbbell/rectangular strips from pipe wall.

Applicable range: DN ≥50 circumferentially-wound/centrifugal cast GRP pipes; DN ≥200 helically-wound GRP pipes. Ideal for large-diameter pipes over DN150 where full pipe sections exceed machine load limits.

Method B (Full Pipe Section Test): Test complete uncut pipe segments (minimum 450mm length).

Applicable range: All GRP pipe types, primary use for DN ≤150 small/medium pipes. Annex A adds anti-buckling solutions for thin-wall helical wound pipes.

Rule of thumb: Both methods carry equal validity, but test results cannot be cross-replaced numerically. Select per product specification standard requirements.

Q3: Does ISO 8513 measure tensile modulus of GRP pipes?

A3: No. The standard explicitly excludes longitudinal tensile modulus testing. Multi-layer GRP laminate walls create uneven strain distribution, making accurate modulus measurement impossible under ISO 8513 procedures. If modulus data is required, users must reference ISO 527-4 (isotropic/orthotropic composites) and ISO 527-5 (unidirectional fiber composites)

Q4: What special grips does ISO 8513 require for Method B full pipe sections?

A4: Standard segmented wedge grips paired with internal mandrels (Figure 1 in standard). For thin-walled helical wound pipes (Annex A), add:

Internal core support to stop pipe buckling before tensile failure

Bonded metallic aluminium reinforcing tabs on gripped zones to eliminate grip crushing failure

Q5: What testing machine meets full ISO 8513 compliance? Can UnitedTest supply this equipment?

A5: ISO 8513 requires constant-rate cross-head tensile testers with ≤±1% force measurement accuracy, adjustable 2–5 mm/min speed, specialized pipe grips, and displacement tracking for elongation calculation.

UnitedTest is a professional manufacturer fully supplying ISO 8513-compliant GRP longitudinal tensile testing machines:

Custom segmented pipe mandrel grips for Method B full pipe testing

Flat reinforced grips + resin-built sample fixtures for Method A strip specimens

0.5-grade precision force sensor, servo closed-loop speed control matching 2–5 mm/min test range

Dedicated test software auto-calculates ISO 8513 strength & elongation formulas and generates standard-compliant test reports

Custom load capacities (10kN–600kN) for DN50~DN1500 GRP pipes, thin-wall anti-buckling core accessories per Annex A

Q6: Which industries perform ISO 8513 GRP tensile testing?

A6: Primary industrial fields:

Municipal infrastructure: Sewer, drainage, potable water GRP pipeline factories & inspection labs

Chemical & petrochemical: Corrosive fluid transport FRP pipe manufacturers

Agriculture: Large-diameter irrigation GRP transmission pipes

Oil & gas: Underground non-metallic gathering pipelines

Marine/offshore, construction fire protection piping

Third-party certification laboratories, university composite material R&D labs

Q7. How should thick-wall or thin-wall pipes be handled?

A7: Thick-wall pipes: specimen width may be reduced to fit the testing machine capacity (this gives a more conservative strength indication); the cut cross-section sides may be clamped; built-up ends are recommended for even force distribution .

Thin-wall helically-wound pipes (Annex A): an internal core support prevents buckling; metallic tabs (e.g., aluminium pipe sections) bonded with glass-fibre fabric tape and thermosetting resin reinforce the grip zone; the tape build-up should taper over ~30 mm .

Q8: Why Choose UnitedTest ISO 8513 GRP Pipe Tensile Test Machine for Lab QC & Certification?

A8: Looking for reliable ISO 8513:2023 test equipment to verify longitudinal tensile properties of your GRP fiberglass pipes? UnitedTest, a specialized manufacturer of plastic and composite pipe testing machines, delivers fully standard-compliant tensile testers optimized for ISO 8513 Method A strip tests and Method B full pipe section tests.

Many GRP pipe manufacturers struggle with inaccurate tensile data, grip slippage, thin pipe buckling, and non-compliant test reports when using generic universal testers. UnitedTest solves all ISO 8513 testing pain points with industry-exclusive upgrades:

Custom segmented wedge mandrel grips designed per ISO 8513 Figure 1, zero slip/crushing for full pipe segments up to DN150

Reinforced flat grip fixtures with resin-built sample holders for dumbbell strip specimens (Method A)

Annex A anti-buckling internal core kits for thin-wall helically filament-wound GRP pipes to avoid premature collapse before tensile rupture

Software pre-programmed with ISO 8513 strength calculation formulas, auto-generates audit-ready test reports matching Clause 11 reporting requirements

Servo closed-loop drive system locking constant 2–5 mm/min cross-head speed, eliminating test speed deviation violations

Our ISO 8513 tensile testing machines serve global clients across sewage GRP pipe production, chemical corrosion-resistant FRP pipeline, oil & gas non-metallic pipe, and agricultural irrigation composite pipe sectors. All equipment meets ISO 7500-1 force accuracy standards, carries CE certification, and supports third-party calibration for laboratory certification compliance.

If you need a complete GRP pipe testing laboratory solution, UnitedTest also supplies matching dimension measuring devices, environmental conditioning chambers, ring stiffness testers, and hydrostatic pressure testing machines, fully aligned with international plastic piping standards including ISO 8513, ISO 7685, ISO 527 series.

Contact UnitedTest today for customized load capacity selection, grip configuration design, and free ISO 8513 test procedure technical support for your GRP pipe quality control lab.

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