ISO 11357-6-2018 PDF

Full title and description

Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT). This International Standard specifies DSC test methods for detecting the onset of oxidative decomposition in polymeric materials and for assessing the effectiveness of antioxidant systems by measuring isothermal oxidation induction time and dynamic oxidation induction temperature.

Abstract

ISO 11357-6:2018 defines procedures using differential scanning calorimetry (DSC) to determine oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) of plastics. The methods are primarily intended for polyolefin resins (stabilized or compounded), as raw materials or finished products, but may be applied to other polymer types. The standard covers instrument and crucible requirements, gas atmosphere control (inert and oxidizing), specimen preparation, calibration, test procedures, data treatment and reporting, and explains limitations and interpretation of OIT/OOT results.

General information

• Status: Withdrawn (Edition 3, 2018).
• Publication date: March 2018.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.080.01 (Plastics — Thermal analysis).
• Edition / version: Edition 3 (2018).
• Number of pages: 12.

Scope

This part of ISO 11357 specifies DSC methods for determination of oxidation induction time under isothermal conditions and oxidation induction temperature under dynamic heating conditions. The methods detect the onset of exothermic oxidation under controlled atmosphere and temperature programs. The standard is intended mainly for polyolefin resins (in fully stabilized or compounded form) and finished plastic products, but the procedures can be applied to other polymeric materials where oxidative stability assessment by DSC is appropriate.

Key topics and requirements

• Principles of isothermal OIT (sample equilibrated under inert gas, then switched to oxidizing atmosphere and time to onset recorded) and dynamic OIT (sample heated in oxidizing atmosphere and temperature at onset recorded).
• Instrument requirements: DSC capable of required temperature range (instrument top temperatures often ≥ 500 °C recommended) and adequate isothermal stability (typical requirement ±0.3 K; tighter stability recommended for high-precision work).
• Crucible and sample considerations: use of open, ventilated or sealed crucibles (aluminium preferred), and recognition that crucible material and geometry influence results.
• Gas control: defined use of inert purge gas (e.g., nitrogen) and oxidizing gas (oxygen or air), with controlled flow rates and a reliable gas-switching system.
• Specimen preparation and conditioning: guidance for representative specimen selection from moulded, extruded or finished parts and reference to specimen-preparation standards as applicable.
• Calibration and procedure: instrument calibration, heating rates, test temperatures, detection of oxidation onset, baseline handling and data-reporting requirements.
• Interpretation and limitations: OIT/OOT are relative measures of oxidative stability/antioxidant effectiveness (not direct measures of antioxidant concentration); results depend on test temperature, heating rate, atmosphere and sample geometry.

Typical use and users

ISO 11357-6:2018 is used for quality control, acceptance testing, R&D and failure analysis where oxidative stability is of interest. Typical users include polymer testing laboratories, materials and formulation scientists, quality engineers at resin producers and converters, certification bodies, and academic researchers working on polymer stabilization and long-term performance.

Related standards

ISO 11357-6 is part of the ISO 11357 series on DSC. Closely related parts include ISO 11357-1 (General principles), ISO 11357-2 (Glass transition), ISO 11357-3 (Melting and crystallization), ISO 11357-4 (Specific heat capacity), ISO 11357-5 (Reaction characteristics), and ISO 11357-7 (Crystallization kinetics). Other test or specimen-preparation standards referenced in practice (for plastics) may also be cited where appropriate.

Keywords

DSC, differential scanning calorimetry, oxidation induction time, OIT, oxidation induction temperature, OOT, oxidative stability, antioxidants, polyolefin, plastics testing, isothermal OIT, dynamic OIT.

FAQ

Q: What is this standard?

A: ISO 11357-6:2018 is an international standard that specifies DSC procedures to measure oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) for assessing oxidative stability of polymeric materials.

Q: What does it cover?

A: It covers the principles and procedures for isothermal and dynamic OIT measurements by DSC, instrument and crucible requirements, gas control, specimen preparation, calibration, data handling, reporting and interpretation considerations. It is primarily aimed at polyolefins but can be applied to other plastics.

Q: Who typically uses it?

A: Polymer testing laboratories, formulation and materials scientists, quality/control engineers at resin producers and converters, certification bodies, and researchers assessing antioxidant performance and oxidative stability.

Q: Is it current or superseded?

A: The 2018 edition (Edition 3) is listed as withdrawn. A later revision of ISO 11357-6 has been published — users should apply the most recent edition available when performing or specifying tests.

Q: Is it part of a series?

A: Yes. It is Part 6 of the ISO 11357 series on Differential Scanning Calorimetry (DSC), which includes Parts 1 through 7 covering general principles, glass transition, melting/crystallization, specific heat capacity, reaction-characteristics, oxidation-induction and crystallization kinetics.

Q: What are the key keywords?

A: DSC, OIT, OOT, oxidation induction time, oxidation induction temperature, antioxidant stability, polyolefin, plastics thermal analysis, isothermal OIT, dynamic OIT.