ISO 24454:2008

Overview

ISO 24454:2008 - Rubber - Acquisition and presentation of comparable multi-point data provides standardized procedures for acquiring and presenting multi-point test data for selected properties of rubber compounds. The standard defines how to generate property data as a function of key variables (time, temperature and environmental effects) so results from different suppliers and laboratories are directly comparable. Annex A gives guidance on interpretation of results.

Key topics and technical requirements

• Scope and purpose
  • Produce comparable multi-point datasets to support material specification sheets and side-by-side supplier comparisons.
• Test piece preparation & conditioning
  • Follow ISO 2393 for mixing/moulding; document equipment and cycles.
  • Timing windows: mixing→moulding (24 h to 1 week); moulding→conditioning (16 h to 4 weeks).
  • Standard laboratory conditions: (23 ± 2) °C and 50 % RH (note guidance if using 27 °C).
• Main variables
  • Temperature, time and environmental agents (liquids, UV, ozone, mechanical cycling).
  • Use integral multiples of 10 °C for series of temperatures, replacing 20 °C with 23 °C.
• Mechanical and viscoelastic testing
  • Tensile stress–strain: ISO 37, Type 1/1A dumbbells, 500 mm/min, minimum six temperatures (one = 23 °C).
  • Dynamic properties: ISO 4664-1 in shear mode (DMTA recommended); frequencies at 0.1, 1, 10 and 100 Hz; strain amplitude ±2 %, zero prestrain; minimum six temperatures.
  • Stress relaxation: ISO 3384 Method A, measure after 167 h at a minimum of four temperatures.
  • Creep: ISO 8013, measure creep increment after 167 h; choose stress to give 20 % initial strain.
• Degradation and environmental tests
  • Heat ageing and lifetime estimation (ISO 11346) to derive T(20000) using Arrhenius or WLF processing.
  • Resistance to liquids (ISO 1817), accelerated weathering (ISO 4665 - xenon arc), ozone exposure (ISO 1431-1), and fatigue (ISO 6943).
• Presentation
  • Report test conditions, number of specimens (as required by test methods) and processed multi-point results for direct comparison.

Practical applications and users

• Enables consistent material specification sheets across suppliers.
• Useful for: rubber compounders, independent test laboratories, OEMs, procurement engineers, R&D teams, quality assurance, and regulatory bodies.
• Typical uses: material selection, lifetime estimation, performance benchmarking, failure analysis and contractual specifications.

Related standards (selected)

• ISO 37, ISO 48, ISO 11346, ISO 1817, ISO 4664-1, ISO 4665, ISO 3384, ISO 8013, ISO 2393, ISO 24453

Keywords: ISO 24454:2008, rubber multi-point data, tensile stress-strain, viscoelastic properties, DMTA, stress relaxation, creep, accelerated weathering, material specification sheets.