ISO 11357-5:2025 PDF

Plastics — Differential scanning calorimetry (DSC) — Part 5: Determination of characteristic reaction-curve temperatures and times, enthalpy of reaction and degree of conversion

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Title (English):

ISO 11357-5:2025

Plastics — Differential scanning calorimetry (DSC) — Part 5: Determination of characteristic reaction-curve temperatures and times, enthalpy of reaction and degree of conversion

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 10
Publication date:: May 9, 2025
Edition:: ISO IS 11357 edition 3 version 1
ICS:: 83.080.01

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Description (English):

This document specifies a method for the determination of reaction temperatures and times, enthalpies of reaction, and degrees of conversion using conventional differential scanning calorimetry (DSC) as specified in ISO 11357-1. The method applies to monomers, prepolymers, and polymers in the solid or liquid state. The material can contain fillers and/or initiators in the solid or liquid state. This document is not applicable to fast DSC as specified in ISO 23976.[ REF Reference_ref_2 \r \h 1 08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000100000005200650066006500720065006E00630065005F007200650066005F0032000000 ]

Technical details

Technical committee: ISO/TC 61/SC 5 - Physical-chemical properties
SKU: ISO 11357-5:2025

Abstract

Overview

ISO 11357-5:2025 - Plastics - Differential scanning calorimetry (DSC) - Part 5 specifies a standardized method for determining characteristic reaction-curve temperatures and times, enthalpy of reaction, and degree of conversion using conventional DSC. The standard applies to monomers, prepolymers and polymers (solid or liquid) and materials that may contain fillers and/or initiators. This edition is limited to conventional DSC and excludes fast DSC (see ISO 23976).

Key topics and requirements

Scope and limits
- Applicable to conventional DSC only; not for fast DSC when reactions overlap decomposition.
- Warning for materials that can give runaway or hazardous reactions.
Methods
- Temperature-scanning method: perform scans (recommended 5 K/min to 20 K/min) from ambient to a temperature that fully captures the reaction peak but below decomposition onset.
- Isothermal method: two options - constant-temperature procedure or start-at-ambient then rapidly heat to measurement temperature. Record times to reaction onset and characteristic times from thermal equilibrium.
Specimen and instrumentation
- Typical specimen mass: 5 mg to 20 mg, adjusted for signal strength.
- Use gas-tight crucibles for specimens releasing volatiles.
- Calibration, apparatus and specimen conditioning as per ISO 11357-1.
Data and calculations
- Define characteristic temperatures (onset, extrapolated onset, peak Tmax, extrapolated end, end) from DSC curves.
- Enthalpy of reaction (ΔHr): integrate area between peak and interpolated baseline.
- Degree of conversion (α): calculated from temperature-scan or isothermal curves; account for residual enthalpy by post-isothermal scan.
Quality and reporting
- Precision and reporting requirements are specified; include test conditions, scan rate, specimen mass and any conditioning.

Applications and who uses it

ISO 11357-5:2025 is practical for:

Polymer R&D and formulation development (polymerization, crosslinking studies)
Quality control in plastics manufacturing (reaction completeness, curing verification)
Materials characterization labs and third-party testing services
Regulatory and safety assessments where thermal reaction behavior and conversion are critical

Keywords: ISO 11357-5:2025, differential scanning calorimetry (DSC), plastics testing, enthalpy of reaction, degree of conversion, polymerization, crosslinking, isothermal DSC, temperature-scan.

Related standards

ISO 11357-1 - General principles, apparatus and calibration for DSC (normative reference).
ISO 23976 - Fast DSC - referenced for cases where high heating rates are needed to separate reaction and decomposition effects.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and requirements

Scope and limits
- Applicable to conventional DSC only; not for fast DSC when reactions overlap decomposition.
- Warning for materials that can give runaway or hazardous reactions.
Methods
- Temperature-scanning method: perform scans (recommended 5 K/min to 20 K/min) from ambient to a temperature that fully captures the reaction peak but below decomposition onset.
- Isothermal method: two options - constant-temperature procedure or start-at-ambient then rapidly heat to measurement temperature. Record times to reaction onset and characteristic times from thermal equilibrium.
Specimen and instrumentation
- Typical specimen mass: 5 mg to 20 mg, adjusted for signal strength.
- Use gas-tight crucibles for specimens releasing volatiles.
- Calibration, apparatus and specimen conditioning as per ISO 11357-1.
Data and calculations
- Define characteristic temperatures (onset, extrapolated onset, peak Tmax, extrapolated end, end) from DSC curves.
- Enthalpy of reaction (ΔHr): integrate area between peak and interpolated baseline.
- Degree of conversion (α): calculated from temperature-scan or isothermal curves; account for residual enthalpy by post-isothermal scan.
Quality and reporting
- Precision and reporting requirements are specified; include test conditions, scan rate, specimen mass and any conditioning.

Applications and who uses it

ISO 11357-5:2025 is practical for:

Polymer R&D and formulation development (polymerization, crosslinking studies)
Quality control in plastics manufacturing (reaction completeness, curing verification)
Materials characterization labs and third-party testing services
Regulatory and safety assessments where thermal reaction behavior and conversion are critical

Keywords: ISO 11357-5:2025, differential scanning calorimetry (DSC), plastics testing, enthalpy of reaction, degree of conversion, polymerization, crosslinking, isothermal DSC, temperature-scan.

Related standards

ISO 11357-1 - General principles, apparatus and calibration for DSC (normative reference).
ISO 23976 - Fast DSC - referenced for cases where high heating rates are needed to separate reaction and decomposition effects.

ISO 11357-5:2025 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

Plastics. Fast differential scanning calorimetry (FSC). Chip calorimetry.

Plastics - Differential scanning calorimetry (DSC) - Part 1: General principles (ISO 11357-1:2023)

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