ISO 13268 Ring Stiffness Test: Thermoplastic Shafts and Risers for Inspection Chambers and Manholes

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ISO 13268 Ring Stiffness Tester | Thermoplastic Inspection Shafts | UnitedTest

ISO 13268 specifies short-term tangential ring stiffness testing for thermoplastic riser shafts used in underground drainage manholes and inspection chambers. UnitedTest manufactures fully compliant ISO 13268 ring stiffness test machines for non-pressure sewer piping system certification.

ISO 13268 is the dedicated international standard for evaluating initial short‑term tangential ring stiffness of thermoplastic shafts and risers designed for inspection chambers and manholes. Tailored for non‑pressure underground drainage and sewerage piping systems, this test method verifies structural rigidity and diametral load resistance under static compression, ensuring thermoplastic shaft components withstand underground soil loading without excessive deformation or structural failure.

The standard adapts core ring stiffness testing principles referenced from ISO 9969, with modified procedures to accommodate circular, rectangular, square and irregular cross‑section thermoplastic riser structures unique to manhole construction. By measuring tangential stiffness performance under short‑term loading, manufacturers and laboratories can validate product structural compliance, confirm installation safety, and classify stiffness grades for municipal drainage infrastructure projects.

UnitedTest designs and manufactures high‑precision ISO 13268 ring stiffness testing machines optimized for thermoplastic manhole shaft and riser testing. Our robust test equipment delivers stable compression loading, accurate deflection measurement and repeatable stiffness data, supporting quality control, batch validation and third‑party certification for underground thermoplastic drainage systems.

Test Principle

Regular cross‑section shafts (symmetric circular shafts)

The test follows ISO 9969 principle: horizontally mount the shaft segment, compress vertically between parallel rigid plates at constant displacement rate. Record force‑deflection curve. Ring stiffness is calculated from force producing diametral deflection of 0.03 dᵢ (3 % inner diameter).

Irregular circular / square / rectangular cross‑section shafts

Apply compressive load at constant rate until shaft deflection reaches 2 %‑6 % of nominal dimension. Measure applied force and corresponding deflection. A shape factor SF is introduced for non‑standard profiles to compute ring stiffness in Pascals (Pa) from measured force, deflection and specimen length.

Testing must ensure deflection difference among three measuring points shall not exceed 0.5 % of shaft nominal dimension to avoid skewed loading.

ISO 13268 Ring Stiffness Test: Thermoplastic Shafts and Risers for Inspection Chambers and Manholes Test Equipment Required

Ring Stiffness Compression Testing Machine	Equipped with two rigid parallel plates/beams for compressive force application. Optional V‑shaped support with included angle ≥ 170° is permitted.
Bearers (loading pads):	- For square/rectangular shafts: bearer width ≤ 25 mm. - For irregular circular shafts: width rules: - DN/ID ≤ 400 mm: max 50 mm - 400 < DN/ID ≤ 1200 mm: max 0.12 × DN/ID (mm) - DN/ID > 1200 mm: max 150 mm - Bearers shall match the outer contour of irregular shafts; bearer length ≥ specimen length
Elastomeric strips	Minimum thickness 3 mm, hardness (50 ± 5) IRHD (per ISO 48‑2), for uneven outer surfaces to guarantee uniform contact between bearers and test piece.
Measuring devices	Force and deflection measurement accuracy: ± 1 % of reading. Length measurement accuracy: ± 0.5 mm. Three‑point deflection acquisition: specimen mid‑point plus points near both ends

Test Specimen Information

Three test pieces, each a riser or segment incorporating a joint element if required.

Regular cross‑section: Minimum length 300 mm; cut smoothly perpendicular to axis. For one‑piece chamber/manhole, cut at least 300 mm from top of main channel.

Irregular/square/rectangular: Whole shaft with additional joint element, or segment cut ≥ 300 mm from top of main channel; length 300 mm to 1 000 mm, chosen for symmetry.

Joint element may be placed on socket or spigot end using manufacturer’s standard sealing/welding system.

Key Test Parameters & Stipulations

Test temperature	(23 ± 2) °C
Deflection target	Regular: 0,03 d (3 % diametral); Irregular/square/rectangular: 2 % to 6 % of shaft dimension
Loading time	3 min to 6 min to reach required deflection
Measurement accuracy	Length: ±0,5 mm; Force/deflection: ±1 %
Deflection uniformity	Difference between three measuring points ≤ 0,5 % of nominal size
Repetition planes	120° apart (circular), 90° (square/rectangular)

Test Procedures of ISO 13268 Ring Stiffness Test: Thermoplastic Shafts and Risers for Inspection Chambers and Manholes

1. Prepare three qualified conditioned specimens, assemble specimen symmetrically inside test rig. For rectangular shafts, align loading line at centre of long side.

2. Set zero‑load deflection datum at three measuring points (mid‑point and two near‑end points).

3. Apply compressive load:

- Regular circular shafts: perform full test procedure as per ISO 9969.

- Irregular / square‑rectangular shafts: apply uniform load to reach deflection 2 %‑6 % within 3‑6 minutes; monitor three‑point deflection difference ≤ 0.5 % nominal dimension. Record force‑deflection data.

4. Rotate next specimen to specified angular offset (120° for circular irregular, 90° for square‑rectangle), repeat test for the remaining two replicates.

5. Compute average force, deflection, length and apply shape‑factor formula to get ring stiffness. Compile complete test report as per standard requirements.

Related Test Standard:

ASTM D2412	Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading
ISO 9969	Thermoplastics pipes — Determination of ring stiffness
ISO 9967	Thermoplastics pipes - Determination of creep ratio
GB/T 9647	China standard: Thermoplastics pipes—Determination of ring stiffness
ISO 10471	Long-term ultimate bending strain / ultimate relative ring deflection under wet conditions — the long-term analogue of the Level-2 damage limit; also uses the 28 % beam-bar rule
ISO 10466	Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Test method to prove the resistance to initial ring deflection
ISO 8521	Glass-reinforced thermosetting plastic (GRP) pipes — Test methods for the determination of the initial circumferential tensile wall strength
ISO 8513	Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods for the determination of the initial longitudinal tensile strength
ISO 10468	Long-term counterpart: ring creep properties under wet or dry conditions, creep factor αₓ,creep, extrapolation to 50 years
ISO 13967	Thermoplastics fittings - Determination of ring stiffness
ISO 13268	Thermoplastics piping systems for non-pressure underground drainage and sewerage — Thermoplastics shafts or risers for inspection chambers and manholes — Determination of ring stiffness
EN 1226	Plastics piping systems. Glass- reinforced thermosetting plastics (GRP) pipes. Test method to prove the resistance to initial ring deflection.
JIS K 7038	Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipes -- Test method to prove the resistance to initial ring deflection
ASTM F2433	Standard Test Method for Determining Thermoplastic Pipe Wall Stiffness
ISO 13968	Plastics piping and ducting systems. Thermoplastics pipes. Determination of ring flexibility
DIN 16961	Thermoplastics pipes and fittings with profiled wall and smooth pipe inside
EN 1228	European method for initial specific ring stiffness, cited alongside ISO 7685
ISO 7685	Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness
EN 1446	Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility
AS/NZS 1462.22	Methods of test for plastics pipes and fittings Method 22: Thermoplastics pipes – Determination of ring stiffness

Industry Applications

Underground non‑pressure drainage and sewerage systems (gravity pipes).
Thermoplastic inspection chambers and manholes (e.g., PVC‑U, PP, PE).
Civil engineering, construction, and infrastructure: road and highway drainage, residential and industrial sewer networks.
Manufacturing and quality control of plastic piping components.
Utilities and municipalities for acceptance testing of buried structures.

ISO 13268 Ring Stiffness Test: Thermoplastic Shafts and Risers for Inspection Chambers and Manholes

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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.

What is ISO 13268?

ISO 13268 is an International Standard that specifies a test method for assessing the initial (short-term) tangential ring stiffness of thermoplastic shafts or risers used in inspection chambers and manholes for non-pressure underground drainage and sewerage. The current edition is ISO 13268:2022, adopted in Europe as EN ISO 13268:2023.

What exactly does the ISO 13268 test measure?

It measures the resistance of a riser shaft to diametral (ring) deformation under a compressive load applied between plates or beams, expressed as a ring stiffness S in pascals (Pa). It is a short-term, initial-stiffness measurement — it is not a creep or long-term test.

Which products must be tested to ISO 13268?

Thermoplastic shafts and risers for inspection chambers and manholes, typically in PVC-U, PP or PE, including structured-wall shafts, shafts with reinforcing rings, and square or rectangular shafts, used in non-pressure underground drainage and sewerage.

How is ISO 13268 different from ISO 9969?

ISO 9969 is the general ring stiffness method for thermoplastics pipes. ISO 13268 uses ISO 9969 directly for shafts with a regular, symmetrical circular cross-section (deflection 0,03 di). Where the shaft has an irregular, square or rectangular cross-section, ISO 13268 modifies the method: the specimen is loaded through bearers shaped to its outer surface, the target deflection is 2 %–6 %, and a shape factor SF is applied in the calculation.

What is the difference between a regular and an irregular cross-section shaft?

A regular cross-section shaft is a circular riser with a regular, symmetrical external design, and may be made from plain pipe, structured-wall pipe or fittings. An irregular cross-section shaft is a circular riser with an irregular, asymmetrical external design — for example, extra reinforcing rings or strengthening structures in specific areas.

What equipment is needed for an ISO 13268 test?

A loading frame with two rigid parallel plates or beams — or one rigid beam plus a V-shaped support with an included angle of 170° or more — capable of applying the compressive force and measuring force and deflection to ±1 %; bearers of the specified width, shaped to the shaft profile if needed; elastomeric strips of at least 3 mm thickness and (50 ± 5) IRHD hardness where the bearing surface is not smooth; and measuring devices giving length to ±0,5 mm. Testing is carried out at (23 ± 2) °C.

Why is the shape factor important, and what changed in the 2022 edition?

The shape factor converts the force–deflection response of a non-circular or non-symmetrical section into a comparable ring stiffness value. Without it, results for square, rectangular or reinforced shafts would not be comparable with ISO 9969 values. The 2022 revision changed the calculation of SF for irregular sections — one of the four main technical changes in the second edition, alongside updated normative references, revised definitions and editorial revision.

Why is this test important for the material and the product?

Because the shaft is buried. Ring stiffness is what allows a thermoplastic riser to resist soil pressure, groundwater and traffic loads without ovalising, cracking, losing joint integrity or collapsing. For thermoplastics in particular, stiffness is a combination of material modulus, temperature and — for structured-wall designs — profile geometry, so the declared performance can only be confirmed by measurement. The test therefore protects structural safety, supports correct installation design, provides production quality control, and gives specifiers and authorities a comparable, standardised number.

Does ISO 13268 set the minimum acceptable stiffness value?

No. ISO 13268 is a test method: it defines how to prepare specimens, load them and calculate S. The required minimum values (stiffness classes) and acceptance criteria are given by the relevant product specification for the piping system or by the project specification.

What must appear in an ISO 13268 test report?

A reference to ISO 13268:2022; full identification of the shaft (manufacturer name and address, type including material and sealing method, dimensions, production date, age at test, lengths of the three test pieces); test temperature; the time taken to apply the load for each test piece; the calculated ring stiffness S to three decimal places; any factor that may have affected the results, including incidents, unspecified operating details or deviations; any unusual features observed; and the date of the test.

Can one machine cover both ISO 9969 and ISO 13268?

Yes, provided the frame can be configured both ways: parallel flat plates and the constant speed regime of ISO 9969 with a 0,03 di deflection criterion, and the bearer/V-support arrangement, 2 %–6 % deflection window and 3–6 min loading ramp required by ISO 13268, with software able to apply the correct shape factor. This is how most ring stiffness testers for the plastics piping industry are specified.

What are the most common sources of error in ISO 13268 testing?

Using bearers of the wrong width or a flat bearer on a profiled shaft; not surfacing bearers with the specified elastomeric strip when contact is uneven; a loading centre that lets the two ends deflect by more than 0,5 % of the nominal size; loading faster or slower than the 3–6 min window; reading deflection outside the 2 %–6 % range; repeating the test in the same plane instead of rotating 120° (circular) or 90° (square/rectangular); testing outside (23 ± 2) °C or with incorrectly aged specimens; and applying the wrong shape factor in the calculation.

Is ISO 13268 a long-term or creep test?

No. It determines the initial (short-term) tangential ring stiffness. Long-term behaviour under sustained load is assessed by separate creep-related methods, which are not part of ISO 13268.

Why choose ISO 13268 Ring Stiffness Testing Machine from UnitedTest?

UnitedTest supplies professional ISO 13268:2022 / EN ISO 13268:2023 ring stiffness testing machine for thermoplastic manhole risers and inspection‑chamber shafts. Our tester performs ring‑stiffness measurement for regular circular, irregular profiled, square and rectangular plastic sewer shafts, fully complying with ISO 13268 standard requirements for specimen clamping, bearer configuration, multi‑point deflection measurement, shape‑factor calculation and standardised test report output.

UnitedTest is a professional manufacturer of ISO 13268 ring‑stiffness test equipment for thermoplastic manhole shafts and inspection‑chamber risers for underground non‑pressure drainage and sewerage systems.

Our ISO 13268 testing machine fulfils all requirements of ISO 13268:2022 and EN ISO 13268:2023, supporting ring‑stiffness testing for four main shaft categories: regular circular cross‑section shafts, irregular/asymmetric ribbed circular shafts, square‑cross‑section and rectangular‑cross‑section thermoplastic risers.

Many conventional pipe ring‑stiffness testers only follow ISO 9969 for standard circular pipes. UnitedTest ISO 13268 test rig is purpose‑built for manhole‑specific complex geometries. It is equipped with interchangeable width‑adjustable bearers, V‑shaped support option, elastomeric bearer padding fixture for uneven specimen surfaces, three‑point deflection measuring system and built‑in calculation algorithm for shape‑factor \(S_F\). The system automatically computes ring‑stiffness value for irregular, square and rectangular specimens and generates complete ISO 13268‑compliant test reports.

Key machine features aligned with ISO 13268 specification:

Force measurement accuracy ± 1 %, deflection accuracy ± 1 %, length measuring accuracy ± 0.5 mm
Configurable bearer width complying with DN/ID‑dependent limits for irregular shafts
Supports test orientations: 120° rotation for irregular circular shafts; 90° rotation for square‑rectangular shafts
Controlled loading rate, monitors deflection difference limit ≤ 0.5 % nominal dimension
Built‑in calculation module for regular cross‑section (ISO 9969 method) and non‑regular cross‑sections including shape‑factor formula
Exportable test report covering all mandatory ISO 13268 report items

This test equipment is widely adopted by plastic manhole manufacturers, third‑party accredited testing laboratories, municipal material‑qualification institutes and R&D centres for PE, PP, PVC‑U thermoplastic sewer‑shaft product development, factory quality control and type‑approval testing for buried gravity drainage infrastructure.

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