ISO 1209-2 Flexural Strength & Apparent Flexural Modulus Testing for Rigid Cellular Plastics

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

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ISO 1209-2 Rigid Cellular Plastics Flexural Strength Tester | UnitedTest

UnitedTest manufactures ISO 1209-2 three-point bending test equipment for rigid cellular plastics. Measure flexural strength and apparent flexural modulus of elasticity for rigid foam materials for R&D and factory quality inspection.

ISO 1209-2 Rigid cellular plastics - Determination of flexural properties - Part 2: Determination of flexural strength and apparent flexural modulus of elasticity

ISO 1209-2 specifies a three-point bending test method for rigid cellular plastics to calculate flexural strength (R), representing the maximum fibre stress developed in bending, and apparent flexural modulus of elasticity (E), indicating bending stiffness. The term "apparent" highlights that cellular plastics are non-homogeneous materials. The measured stiffness accounts for shear deflection and local cell-wall crushing or indentation at loading and support edges. Therefore, E serves as an engineering, configuration-dependent value rather than an absolute material constant applicable to all geometries. UnitedTest provides professional testing machines meeting ISO 1209-2 requirements for rigid cellular plastic flexural property evaluation.

Test Principle

A rectangular beam‑shaped specimen rests on two parallel supporting edges. A central loading edge applies a perpendicular load at a constant displacement rate at the mid‑span between supports (three‑point bending). The force‑deflection curve is continuously recorded.

- Flexural strength is calculated from the maximum breaking force before fracture.

- Apparent flexural modulus is derived from the tangent slope of the initial linear portion of the force‑deflection curve.

Tests normally stop when flexural strain reaches 5 % (30 mm deflection for recommended specimens) unless fracture occurs earlier. If local crushing appears under loading nose, flexural‑strength results shall be discarded.

Test Equipment required for ISO 1209-2 Flexural Strength & Apparent Flexural Modulus Testing for Rigid Cellular Plastics

Recommend UnitedTest Universal Testing Machine and Bending fixtures.

Universal testing machine

Provides constant cross‑head moving speed; force measurement accuracy ±1 %; equipped with simultaneous force‑deformation recording device.

Three-point bending fixture

1. Specimen supports: Two parallel cylindrical support edges, edge radius (15 ± 1) mm, span adjustable 200–450 mm (recommended span 300 mm). Support‑edge length exceeds specimen width.

2. Loading edge: Same cylindrical geometry and dimension as supports, positioned centrally and parallel to two supports.

ISO 1209-2 Flexural Strength

Dial‑gauge micrometer

Complies with ISO 1923, for measuring specimen linear dimensions (length, width, thickness).

Test Specimen Information

Specimens are rectangular parallelepiped bars, with key dimensions below:

Dimension	Recommended value	Limit / requirement
Length l	350 mm	≥ (L + 50) mm
Width b	4 d	≥ 2 d
Thickness d	25 mm	15 – 38 mm
Span L	300 mm	12 d to 16 d

Preparation: Cut specimens without degrading original cellular microstructure. If surface skin exists on one/multiple sides, this must be documented.
Quantity: Minimum 5 specimens per material sample.

Key Test Parameters:

Cross‑head loading speed

- For apparent flexural modulus: (20 ± 1) mm/min

- For flexural‑strength measurement: either (20 ± 1) mm/min or (100 ± 10) mm/min.

Calculation formulas

1, Flexural strength R (kPa):

ISO 1209-2 Flexural Strength

where FR = maximum applied force (kN), L = span (mm), b = width (mm), d = thickness (mm).

(This is the classic 3-point bending relation σ = 3FL / 2bd², with the 10⁶ factor converting kN/mm² to kPa.)

2, Apparent flexural modulus of elasticity E (kPa):

ISO 1209-2 Flexural Strength

where Ft = force (kN) corresponding to deflection xt (mm) taken on the tangent to the steepest portion of the curve; L, b, d as above. (Equivalent to E = L³m / 4bd³ with m = slope of the tangent.)

Report individual values plus the arithmetic mean for flexural strength, apparent modulus, and — where applicable — breaking load (in newtons).

Details Test Procedures of ISO 1209-2 Flexural Strength & Apparent Flexural Modulus Testing for Rigid Cellular Plastics

Measure specimen length, width, thickness following ISO 1923 requirements.
Place specimen symmetrically across two support edges.
Operate testing machine at specified constant cross‑head rate, apply central perpendicular load to specimen.
Record full force‑versus‑deflection curve; draw tangent to steepest linear segment for modulus calculation.
Record breaking load if fracture occurs before reaching 5 % flexural strain. Normally stop test at 5 % strain (30 mm deflection for recommended specimen).
Inspect for crushing damage under loading nose; discard flexural‑strength values if crushing is observed.
Compute individual and mean flexural‑strength and apparent‑modulus results.
Compile complete test report following Clause 10 of ISO 1209‑2:2007, including material description, skin status, conditioning, specimen dimensions, span, test speed, temperature‑humidity, anisotropy orientation, raw data, averages, deviations and test date

Test Application (Industry & Material Scope)

This standard applies to rigid cellular plastics / rigid polymer foams, e.g. rigid polyurethane foam, phenolic foam, polystyrene rigid foam, used widely in:

Construction & building: thermal‑insulation boards, structural insulated panels (SIP), sandwich panel cores, roofing and wall components.
Transportation: interior structural foam components for rail, automotive and marine.
Light‑weight composite, refrigeration and cold‑chain insulation sectors.

The test delivers stiffness and failure‑under‑bending data for material selection, incoming‑quality control, product development and design verification of foam‑containing structural parts.

Related Standard:

ASTM D790	Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
ISO 14125	Fibre-reinforced plastic composites -- Determination of flexural properties
ASTM D6272	Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending
ASTM D7264	Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials
ISO 178	Plastics — Determination of flexural properties
GB/T 9341	Equivalent to using ISO 178
JIS K 7171	Japan standard Basically consistent with the technical content of ISO 178. (プラスチック－曲げ特性の求め方)
ISO 1209-1	Rigid cellular plastics - Determination of flexural properties - Part 1: Basic bending test
ISO 1209‑2	Companion part of the same series; determines flexural strength and apparent flexural modulus of elasticity for rigid cellular plastics (calculates formal flexural mechanical properties)
GB/T 8812.2	(China) — identical adoption of ISO 1209-2:2004; GB/T 8812.1-2007 is identical to ISO 1209-1:2004.
EN 12089	Thermal insulating products for building applications — Determination of bending behaviour. Three-point loading, Method A on full-size products and Method B on specimens (thickness ≤ 100 mm, length 5×thickness + 50 mm, width 150 mm); support diameters 80 ± 3 mm or 30 ± 3 mm; span 300–1200 mm (A) / 200–500 mm (B); ≥ 3 specimens; conditioning ≥ 6 h at (23 ± 5) °C; repeatability ≈ 5 %, reproducibility ≈ 15 %. It is the European product-level counterpart (harmonised under the Construction Products Regulation), whereas ISO 1209-2 is a material-level method.
DIN 53423	Germany corresponding bending test for rigid foams.
ASTM C203	Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation, commonly used in North America as the functional counterpart for insulation boards.

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A single column tensile tester is a sophisticated material testing instrument designed for measuring mechanical properties of various materials under tension, compression, bending, shear, and other loading conditions. As the name suggests, it features a single vertical column supporting a moving crosshead that applies force to test specimens.

Three-point bending test fixture for fiber-reinforced plastic composites, designed in accordance with ISO 14125, provides a standardized method for determining the flexural properties of composite materials using a three-point bending test.

ISO 1209-2 Flexural Test Machine | Rigid Foam Bending Tester | ISO 1209-2 Flexural Strength & Apparent Flexural Modulus Testing Machine for Rigid Cellular Plastics

UnitedTest designs and manufactures testing machines and three-point bending fixtures for ISO 1209-2, the international method for determining the flexural strength and apparent flexural modulus of elasticity of rigid cellular plastics. Our systems pair a constant-speed universal testing machine with ±1 % load accuracy and synchronized force/deflection recording with a precision bending fixture using (15 ± 1) mm cylindrical support and loading edges and a span adjustable from 200 mm to 450 mm — exactly the configuration the standard requires.

The result is a laboratory-ready solution for rigid foam producers, insulation board manufacturers, sandwich-panel makers and independent certification labs: one frame that covers ISO 1209-2 and ISO 1209-1, and, with interchangeable fixtures, ISO 844 (compression), ISO 1926 (tensile), ASTM C203 and EN 12089. Software automatically applies the ISO 1209-2 equations, draws the tangent for the apparent modulus, flags crushed specimens for rejection, and generates a test report containing all mandatory items of Clause 10.

Optional environmental chambers extend testing to the standard's alternative temperatures from −196 °C to +40 °C, so cold-chain, LNG and roofing products can be qualified under real service conditions.

1. What does ISO 1209-2 measure?

It determines two quantities for rigid cellular plastics: flexural strength R (maximum fibre stress in bending, kPa) and apparent flexural modulus of elasticity E (bending stiffness, kPa). Both come from one recorded force/deformation curve obtained in three-point bending.

2. Why is the modulus called "apparent"?

Because foam is a cellular, non-homogeneous structure. Measured deflection includes not only pure bending but also shear deformation and local crushing/indentation under the loading and support edges. The value is therefore a configuration-dependent engineering number, valid for the specified span-to-thickness ratio, edge radii and speed — not an intrinsic material constant.

3. Why is the ISO 1209-2 test important for the material?

Rigid foam boards are rarely just insulation — they carry load. Flexural strength governs survival in transport, handling, foot traffic during installation, wind suction on façades and service loads on roofs and floors; apparent modulus governs deflection, sag and allowable span. Both are highly sensitive to density, cell structure, cure level, blowing agent, skin formation and ageing, making the test a sharp QC signal that catches batch drift before thermal performance visibly changes. The mandatory duplicate sets (parallel vs. normal to anisotropy; skin in tension vs. compression) also turn anisotropy and skin effects into reportable engineering data that no thermal test provides.

4. What is the difference between ISO 1209-1 and ISO 1209-2?

ISO 1209-1 is a simple screening test on a 120 × 25 × 20 mm bar with a 100 ± 1 mm span, reporting only the load at 20 mm deflection or at break; it cannot yield flexural strength or modulus. ISO 1209-2 uses a large specimen (≥ 350 mm long, 15–38 mm thick), span = 12 d–16 d and 15 mm edge radii, and is the method that produces R and E.

5. What test speed applies?

(20 ± 1) mm/min for the apparent flexural modulus; either (20 ± 1) mm/min or (100 ± 10) mm/min for other flexural properties. Higher strain rate raises strength and modulus, so speed must be stated in the report and kept constant when comparing data.

6. When is the test stopped?

Record the breaking load if break occurs before 5 % deflection; normally it is unnecessary to continue beyond 5 % strain (≈ 30 mm deflection with the recommended set-up). Then inspect the specimen: if crushing is found, disregard the flexural strength value.

7. What precision can be expected?

Repeatability limit ≈ 5 %, reproducibility limit ≈ 15 %, at 95 % confidence. Results are comparable only when span, speed, specimen size, conditioning and edge radii are identical.

8. How does ISO 1209-2 relate to ASTM C203 and EN 12089?

All three are three-point bending methods for insulation and cellular plastics. ISO 1209-2 is material-level with a fixed specimen/span relationship. EN 12089 is the European product-level method (full-size products, Method A; specimens, Method B) used for construction product declarations. ASTM C203 is broader — Test Method I (centre loading) and Test Method II (four-point loading) with four loading procedures. One UTM can cover all three with configurable fixtures.

9. Can one machine cover ISO 1209-2, ISO 844 and ISO 1926?

Yes — all are low-force mechanical tests on rigid cellular plastics; only the fixture changes (three-point bend kit, compression platens, tensile grips). Interchangeable kits and method-specific software templates let one frame run the whole suite.

10. What load capacity should I choose?

Size the load cell to the expected breaking load, not the frame. Most rigid insulation foams break well below 1–2 kN, so 1 kN, 2 kN or 5 kN cells are typical; dense structural cores may need 10 kN. The governing rule is ±1 % load measurement accuracy, so an oversized cell is a compliance risk.

11. Is crosshead displacement acceptable for deflection?

The standard requires simultaneous recording of force and the corresponding deformation. For E, the tangent slope near the origin matters most, where machine compliance and fixture seating are significant — a dedicated mid-span deflectometer, or verified displacement accuracy with compliance correction, gives more reliable E values than raw crosshead travel.

12. Why must crushed specimens be discarded?

Crushing is local collapse under the loading or support edges, not a true bending failure. The measured maximum force then reflects indentation resistance rather than flexural strength, and is not comparable with a valid bending result.

13. Why choose ISO 1209‑2 Rigid Cellular Plastics Flexural Test Machine from UnitedTest?

UnitedTest manufactures ISO 1209‑2:2007 compliant universal testing machine with dedicated three‑point bending fixture for rigid cellular plastics. Measure flexural strength and apparent flexural modulus for PU, EPS, phenolic rigid foam for construction insulation, sandwich panel lab quality control.

UnitedTest is a professional manufacturer of universal mechanical testing machines and standardized test fixtures for rigid cellular plastics testing, fully complying with ISO 1209‑2:2007 Rigid cellular plastics‑Determination of flexural strength and apparent flexural modulus of elasticity.

Our complete ISO 1209‑2 test solution includes computer‑controlled universal test frame plus dedicated three‑point bending fixture with 15 ± 1 mm cylindrical loading & support rollers, adjustable support span covering 200 mm‑450 mm (recommended 300 mm span). It meets machine requirements: ±1 % force measurement accuracy, synchronous force‑deflection curve recording, configurable cross‑head test speed 20 mm/min or 100 mm/min as per ISO 1209‑2 procedure.

This testing system is widely used for rigid polyurethane foam, EPS/XPS polystyrene foam, phenolic foam and other rigid cellular materials for building thermal‑insulation boards, sandwich panel core materials, refrigeration insulation and lightweight composite components.

The UnitedTest ISO 1209‑2 bending test setup helps material labs, foam manufacturers, third‑party inspection institutes to run standardized three‑point bending tests, calculate flexural strength and apparent flexural modulus automatically, generate test reports following ISO 1209‑2 reporting clauses.

Key Features:

Dedicated ISO 1209‑2 bending fixture with 15 mm radius cylindrical edges, avoid local specimen crushing
Adjustable support span (200‑450 mm), easily meet span‑thickness ratio requirement 12d‑16d
Constant speed cross‑head: 20±1 mm/min /100±10 mm/min selectable
Real‑time force‑deflection curve recording, auto‑calculate flexural strength and apparent flexural modulus
Export full test report covering specimen info, conditioning parameters, individual values and mean results
One machine supports tension, compression, bending, for multi‑purpose foam mechanical testing.

If you are looking for reliable ISO 1209‑2 test machine for rigid cellular plastics flexural property evaluation, contact UnitedTest for technical datasheet and fixture proposal.

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