ISO 34 is a withdrawn ISO standard focused on determining tear strength in vulcanized rubber using trouser, angle, and crescent test pieces.
If you need to match an internal drawing note or customer requirement that calls out “ISO 34” (especially older documentation), contact our team and we’ll help you align the citation to the right current method and equipment setup.
ISO 34:1979 — Rubber, vulcanized — Determination of tear strength (trouser, angle and crescent test pieces)
ISO 34:1979 is an older (now withdrawn) test-method document for measuring tear strength of vulcanized rubber using three common specimen geometries: trouser, angle, and crescent.
In most modern specifications, the work historically referenced as “ISO 34” is typically cited to the ISO 34 series (for example, ISO 34-1 for trouser/angle/crescent and ISO 34-2 for small Delft test pieces). Where the cited edition matters, always follow the exact version named in the contract or drawing note.
Quick Definition
ISO 34 is a tear-strength test reference for vulcanized rubber that evaluates the force required to propagate a tear in a defined specimen shape (trouser, angle, or crescent).
What This Standard Covers
ISO 34:1979 addresses tear strength measurement for vulcanized rubber using specified test piece geometries intended to produce a controlled tear path.
Because tear results are highly sensitive to specimen geometry and notch/tear initiation details, the test piece type called out in the requirement (trouser vs. angle vs. crescent) is a key part of what “ISO 34” means in practice.
Why This Standard Matters in Testing
Tear strength is commonly used to compare compound robustness, assess reinforcement and processing effects, and screen material changes that could affect cracking or tearing in service.
From a purchasing and QA/QC standpoint, tear testing is often used as a release or comparison metric rather than a single “pass/fail” value that applies across all rubber types and product geometries.
Common Materials, Product Types, or Applications Covered
ISO 34:1979 is associated with vulcanized rubber materials and rubber goods where resistance to tearing is a functional concern.
Typical examples: General rubber compounds, molded rubber parts, gaskets/seals, and other elastomer components where tears can initiate at edges, cuts, or defects (application details depend on the product and the cited edition).
Common Test or Verification Workflow
A typical ISO 34-style tear workflow is built around repeatable specimen preparation and a controlled tensile pull that propagates a tear through the test piece.
Common workflows: Prepare die-cut specimens (trouser/angle/crescent) from sheet or product, introduce any specified nick/notch features for tear initiation, condition specimens as required, pull on a tensile tester at a defined rate, and report tear strength in the format required by the controlling document.
Equipment Commonly Used for This Standard
ISO 34 tear testing is typically performed on a universal testing machine configured for elastomer force ranges and stable tear propagation.
Common equipment: Universal testing machine (UTM) with appropriate load cell capacity, grips suitable for rubber tear specimens, and test control capable of maintaining the required crosshead speed for the cited method.
Common accessories: Specimen dies/cutters (to produce the specified trouser/angle/crescent shapes), nick/notch preparation tools where required, thickness measurement tools, and environmental conditioning capability when a controlled test temperature is specified.
How to Read This Designation or Revision
ISO 34:1979 indicates ISO standard number 34 with a publication year of 1979.
Status sensitivity: ISO 34:1979 is withdrawn, and many modern purchase orders and internal specifications instead cite later replacements in the ISO 34 series. For quoting equipment and fixtures, the most important detail is the exact specimen type and method edition named in the requirement.
Related Standards, Methods, or Frameworks
Depending on your requirement, “ISO 34” may be paired with newer parts in the ISO 34 series that define updated procedures for the same general tear-strength intent.
Common related references: ISO 34-1 (trouser, angle, and crescent test pieces) and ISO 34-2 (small Delft test pieces for limited material or small finished products).
Get a Quote for ISO 34 Tear Testing Equipment
If you’re selecting a UTM, grips, and cutting tools for tear testing (and need the configuration to match the specimen type and force range you run), you can request a detailed quote for a setup aligned to your lab workflow.