Overview
ISO 16589-2:2011 defines the standard vocabulary for rotary shaft lip‑type seals incorporating thermoplastic sealing elements (for example, PTFE-based compounds) intended for use under low‑pressure conditions. This part of ISO 16589 focuses on consistent terminology to describe seal types, components, tolerances, visual imperfections, storage/handling/installation and performance test methods. It complements the other parts of ISO 16589 (dimensions, storage, testing, visual identification) and references ISO 5598 for fluid‑power vocabulary.
Key topics
- Types of seals
Standardized names and descriptions for rotary shaft lip‑type seals (metal‑cased, semi‑covered, hydrodynamically aided, protection lips, etc.) to avoid ambiguity in design and procurement.
- Parts, tolerances and fits
Vocabulary for seal components, mating shaft/housing interfaces and fit/tolerance concepts used in low‑pressure thermoplastic seal applications.
- Visual imperfections
Terms describing surface defects and acceptable imperfections relevant to thermoplastic sealing elements.
- Storage, handling and installation
Terminology covering practices that affect seal integrity and service life prior to and during installation.
- Performance test method
Defined terms related to test procedures and performance criteria (see ISO 16589‑4 for procedures).
- Cross‑language consistency
Includes equivalent terms in French (official) and published German/Chinese versions (for member bodies), noting only official ISO languages are normative.
Applications
ISO 16589‑2 is used where clear, unambiguous language is critical for:
- Seal designers and manufacturers specifying thermoplastic (PTFE‑based) lip seals for rotating shafts
- Engineering teams creating drawings, specifications and bills of materials
- Test laboratories and quality assurance teams conducting and reporting performance tests
- Procurement and supply chain professionals writing purchase specifications for low‑pressure sealing devices
- Maintenance and reliability engineers selecting replacement seals and documenting installation procedures
Practical benefits include reduced miscommunication between design, manufacturing and suppliers, improved consistency in technical documentation, and clearer acceptance criteria during inspection and testing.
Related standards
- ISO 16589 series (Part 1: nominal dimensions and tolerances; Part 3: storage/handling/installation; Part 4: performance test procedures; Part 5: visual imperfections)
- ISO 5598 - Fluid power systems and components: vocabulary
- ISO 6194 - Seals incorporating elastomeric sealing elements (complementary reference)
- ISO 4287 / ISO 4288 - Surface texture/profile methods (referenced for surface terminology)
Keywords: ISO 16589-2, rotary shaft lip‑type seals, thermoplastic sealing elements, PTFE seals, vocabulary, low‑pressure seals, seal terminology, sealing devices, performance testing.