Overview
ISO/TS 16096:2021 - Reclaimed isobutene‑isoprene (IIR) rubber - Evaluation procedure - defines standardized test methods, materials and processing for assessing reclaimed IIR rubber. The technical specification covers sampling, physical and chemical tests on raw reclaimed IIR, preparation of standard test mixes, curemeter evaluation of vulcanization behavior, and measurement of rheological and mechanical properties (Mooney viscosity, tensile stress‑strain, Shore hardness). This ISO/TS supports consistent quality control and comparative evaluation of reclaimed IIR rubber used in rubber recycling and product formulation.
Key topics and requirements
- Scope and sampling
- Laboratory sampling and sample preparation are specified in accordance with ISO 1795.
- Physical and chemical tests on raw reclaimed IIR
- Mooney viscosity: ML(1+4) at 100 °C (ISO 289‑1).
- Acetone extract: ISO 1407 (method A or B).
- Ash content: ISO 247‑1 (method A).
- Carbon black content: ISO 1408 (Method A).
- Rubber content calculation: R = 100 − (carbon black + ash + acetone extract) per ASTM D297 clauses.
- Standard test formulation and mixing
- Defines a reference formulation (reclaimed IIR + zinc oxide, sulfur, ZBEC, MBT, plus contributions x,y,z for carbon black, extract and ash).
- Detailed laboratory mill mixing procedure, roll temperatures (50 °C ±5 °C), batch handling and conditioning.
- Vulcanization and curemeter testing
- Curemeter procedures for oscillating‑disc (ISO 6502‑2) and rotorless curemeter (ISO 6502‑3) with defined conditions (die temperature 160 °C ±0.3 °C, oscillation frequency 1.7 Hz, specified amplitudes and torque/full‑scale deflection requirements).
- Standard cure parameters to be recorded (minimum/maximum torque, defined cure times t' (50/90/95/99), etc.).
- Mechanical property evaluation
- Mooney of test mixes, tensile properties (ISO 37) after vulcanization at 160 °C for 30 min, conditioning (16–96 h), and Shore A hardness (ISO 48‑4).
- Reporting
- Test report requirements include identification, methods used, reference materials, curemeter type and settings, ambient conditions and all results.
Applications and users
- Quality control and acceptance testing of reclaimed IIR rubber for reprocessing and reuse.
- Material suppliers, reclaimers, rubber compounders and R&D laboratories applying consistent evaluation procedures for reclaimed rubber.
- Procurement and specification teams defining supplier acceptance criteria and comparative performance of reclaimed feedstocks.
- Regulatory and certification bodies needing traceable test data for recycled rubber products.
Related standards
Key normative references include ISO 37, ISO 48‑4, ISO 289‑1, ISO 1407, ISO 247‑1, ISO 1408, ISO 1795, ISO 6502‑2, ISO 6502‑3, and ASTM D297. These documents provide the referenced test methods and conditioning procedures used throughout ISO/TS 16096:2021.