ISO 899-1:2017 is an ISO test method for determining the tensile creep behavior of plastics using standardized dumb-bell test specimens under controlled conditioning and test environments.
This standard is commonly used when teams need time-dependent deformation data for engineering design, R&D comparisons, or quality control—especially where temperature, humidity, and specimen history can materially affect results. If you need help aligning grips, extensometry, and environmental control to the edition cited in your requirement, you can talk with our team.
ISO 899-1:2017 — Plastics — Determination of creep behaviour — Part 1: Tensile creep
ISO 899-1 defines a laboratory approach for measuring tensile creep in plastics by applying a tensile load to a standardized specimen and monitoring extension over time under specified environmental conditions.
It is intended for rigid and semi-rigid plastics, including non-reinforced, filled, and fibre-reinforced materials, using dumb-bell shaped specimens that are moulded or machined.
Quick Definition
ISO 899-1 in one line: A tensile creep test method for plastics that measures time-dependent elongation of a dumb-bell specimen under a sustained tensile load, typically with controlled temperature and humidity.
What This Standard Covers
ISO 899-1 focuses on tensile creep measurement, including how test specimens are conditioned and how deformation is measured during a sustained load period.
For higher-confidence engineering design data, the standard emphasizes direct gauge-length measurement using extensometry. For some research and quality-control use cases, extension may be derived from crosshead/grip separation (nominal extension), with the understanding that this can change the meaning and comparability of the result.
Why This Standard Matters in Testing
Tensile creep data is often used to evaluate whether a plastic component will continue to elongate under sustained service stress, potentially affecting fit, alignment, sealing, or long-term dimensional stability.
Because creep response can shift significantly with specimen preparation, dimensions, and environmental history, ISO 899-1 is frequently referenced to standardize the test setup so results can be compared more reliably across materials, lots, or processing conditions.
Common Materials, Product Types, or Applications Covered
ISO 899-1 is used for plastics where time-dependent deformation under tensile stress is a concern.
Common materials: Rigid and semi-rigid thermoplastics and thermosets, including filled and fibre-reinforced plastics, prepared as dumb-bell specimens.
Common product contexts: Injection-moulded parts, sheet-derived specimens, and machined specimens taken from moulded articles where long-term strain under load is an engineering concern.
Common Test or Verification Workflow
A typical ISO 899-1 tensile creep workflow is centered on controlling the specimen condition and environment, applying a defined tensile load, and tracking extension over a specified time window.
Common workflow steps: Condition specimens to the required atmosphere, mount the dumb-bell specimen in tensile grips, stabilize the test environment (often temperature and/or humidity), apply the specified tensile load, and record extension versus time using the required measurement approach (preferably gauge-length extensometry for engineering design use).
Practical caution: Equipment selection and results interpretation are strongly influenced by how strain is measured (extensometer vs nominal extension), the test environment control, and any requirements around specimen preparation and thermal history.
Equipment Commonly Used for This Standard
ISO 899-1 tensile creep testing typically points to a controlled-load tensile setup capable of holding stable stress over time and measuring small changes in extension reliably.
Common equipment families: Tensile creep frames or lever/dead-weight creep systems; appropriate tensile grips for dumb-bell specimens; extensometers for direct gauge-length measurement (often required for engineering-design data); environmental chambers or temperature-controlled enclosures; and time-based data acquisition for extension measurement.
If you are comparing load-range, gripping, extensometer type, or environmental control for your materials, you can request a detailed quote for an ISO 899-1-oriented setup.
How to Read This Designation or Revision
ISO 899-1 indicates Part 1 of the ISO 899 series on plastics creep behaviour, focused on tensile creep.
:2017 indicates the publication year of the referenced edition. ISO 899-1:2017 is Edition 3 and remains the current published edition (it was confirmed during a systematic review in 2022). When receiving a test requirement, always match the exact year/edition cited, because setup, conditioning references, and reporting expectations can be edition-sensitive.
Related Standards, Methods, or Frameworks
ISO 899-1 is commonly used alongside other ISO plastics references that define conditioning, tensile specimen conventions, and companion creep modes.
Often paired references: ISO 291 (standard atmospheres for conditioning and testing), ISO 527-1 and ISO 527-2 (tensile testing principles and specimen/test conditions for many plastics), ISO 472 (plastics vocabulary), and ISO 899-2 (flexural creep by three-point loading) when flexural creep is also required.
Get help selecting an ISO 899-1 tensile creep setup
If you need to run tensile creep with gauge-length extensometry, stable long-duration loading, and controlled temperature/humidity, we can help translate your cited edition into an equipment configuration. Share your material type, target stress range, temperature window, and duration, and ask for a quote.