ISO 3386-1 is an ISO test method used to characterize how low-density flexible cellular polymeric materials behave under compression, producing a stress/strain response that can be used for product comparison and quality control.
It is commonly referenced for flexible foams and similar cellular materials where load-bearing feel, cushioning response, and compression performance need to be quantified. If you need help mapping this standard to your material type or test setup, talk with our team.
ISO 3386-1:2025 — Polymeric materials, cellular flexible — Determination of stress-strain characteristics in compression — Part 1: Low-density materials
ISO 3386-1 specifies a laboratory approach for determining compression stress/strain characteristics for low-density flexible cellular materials, and for calculating a compression stress value from the measured response.
This standard is used when you need a repeatable, standards-based way to compare compression behavior across foam batches, suppliers, formulations, or production conditions.
Quick definition
ISO 3386-1 is a compression characterization method for low-density flexible cellular materials (up to 250 kg/m3), reporting stress/strain behavior and a calculated compression stress value.
What this standard covers
ISO 3386-1 covers the determination of compression stress/strain characteristics for low-density flexible cellular materials, along with a calculation of compression stress value based on the test results.
In practical terms, it focuses on how a flexible cellular material resists compressive deformation under controlled conditions, supporting consistent comparisons between materials tested the same way.
Why this standard matters in testing
Compression response is a key performance attribute for many flexible cellular products. ISO 3386-1 provides a recognized, repeatable framework for quantifying that response so results can be communicated across internal teams, suppliers, and customer specifications.
For many programs, the value of this method is less about a single “pass/fail” number and more about controlling material consistency, monitoring process drift, and comparing alternatives using a consistent stress/strain measurement approach.
Common materials, product types, or applications covered
ISO 3386-1 is typically applied to low-density flexible cellular polymeric materials where compression behavior is important.
- Flexible polymer foams and cellular cushioning materials
- Comfort, padding, and energy-absorbing components where compressive feel or load-bearing response is specified
- Production and incoming inspection programs that track compression behavior over time
Common test or verification workflow
While exact details depend on the cited edition and any customer-specific requirements, ISO 3386-1 testing is typically run as a controlled compression measurement on prepared foam specimens.
Common workflow: Prepare specimens, measure relevant dimensions, compress the specimen between parallel platens under controlled conditions, record force versus deformation (stress/strain), and calculate the compression stress value defined by the standard.
Practical caution: Results can be sensitive to specimen preparation, alignment, platen parallelism, and the way deformation is measured. Matching the specified edition and reporting format is important when you are comparing results across labs or suppliers.
Equipment commonly used for this standard
ISO 3386-1 generally points to compression testing capability with stable, repeatable platen loading and reliable force and deformation measurement.
- Universal testing machine (UTM) or compression tester with appropriate force capacity and control
- Compression platens designed to load the specimen evenly and maintain alignment
- Force measurement (load cell) and deformation/displacement measurement suitable for stress/strain characterization
- Software for capturing force–deformation data and generating the calculated value(s) required by the method
If you are selecting a compression test frame, platen set, or control/software package for ISO 3386-1 work, you can request a detailed quote based on your specimen size range and target force/deflection needs.
How to read this designation or revision
ISO 3386-1 identifies Part 1 of the ISO 3386 series for compression stress/strain characterization of flexible cellular materials.
Year suffix (example: ISO 3386-1:2025): The year indicates the published edition being used. Test setup and reporting requirements should be aligned to the exact cited edition in your purchase specification, drawing note, or customer requirement.
Status note: ISO 3386-1:2025 is published as the current edition, and earlier editions such as ISO 3386-1:1986 (and its 2010 amendment) are listed as withdrawn by ISO.
Related standards, methods, or frameworks
ISO 3386 is a multi-part series. If you are working with denser flexible cellular materials, you may also encounter the corresponding Part 2 document for high-density materials.
Common companion reference: ISO 3386-2 (high-density materials) is frequently used when the material density falls outside the low-density range addressed by Part 1.
Get help selecting an ISO 3386-1 test setup
If you are equipping a lab for foam compression characterization and want a configuration that matches ISO 3386-1 reporting needs, ask for a quote and we will recommend a practical system layout (frame capacity, platens, measurement approach, and data capture) based on your material and throughput.