ISO 22007-1:2024
Plastics
- Standard No.
- ISO 22007-1:2024
- Release Date
- 2024
- Published By
- International Organization for Standardization (ISO) IX / ISO
- Latest
- ISO 22007-1:2024
- Introduction
Analysis of the core content of the standard
ISO 2207-1:2024 third edition, as the basic standard for the determination of thermal transfer properties of plastics, systematically standardizes the general principles of 9 types of test methods such as hot wire method and flash method. Compared with the 2017 edition, the main revisions include: deleting unused term definitions, adding the term contact resistance (3.7), and renaming the laser flash method to the light flash method.
Test Method Technology Comparison
Method Type Typical Accuracy Test Range(W/m·K) Applicable Form Hot Wire Method(5.2) ±3% 0.1-1.0 Solid/Melt Transient Plane Heat Source Method(5.4) ±2% 0.005-500 Anisotropic Material Light flash method(5.6) ±5% 0.1-2000 Thin film/liquid
Key technology innovation
The 2024 version strengthens the evaluation of the impact of contact resistance on measurement accuracy (3.7) and clarifies the calculation model of surface thermal resistance STR: R = d/λ (d is the material thickness, λ is the thermal conductivity). The new temperature modulation technology (5.8) can measure low thermal conductivity materials of 0.026-0.6 W/m·K.
Application Case: PMMA Test
When using the transient plane heat source method to measure polymethyl methacrylate, the probe pressure needs to be controlled to be greater than 10kPa to ensure thermal contact. The test time window is recommended to be 3-60 seconds to avoid boundary effects. The measured thermal conductivity is 0.193W/(m·K), which deviates from the literature value by less than 1.5%.
Implementation recommendations
- For anisotropic materials, the flash method is preferred for in-plane/penetration testing
- The line source method (5.3) is recommended for melt state measurement, and the measurement time is controlled within 30-60 seconds to avoid degradation
- For ultra-thin films (nm level), two variants of the thermal reflection method are recommended: back heating/front detection or front heating/front detection
Measurement uncertainty control
According to Appendix A, the main error sources include: boundary condition deviation (±1.2%), contact thermal resistance (±2.8%) and sample size tolerance (±1.5%). When using the TPS method, the statistical error can be controlled to <1% through time window optimization.
ISO 22007-1:2024 Referenced Document
- ISO 472 Plastics — Vocabulary — Amendment 1: Additional items
ISO 22007-1:2024 history
- 2024 ISO 22007-1:2024 Plastics
- 2017 ISO 22007-1:2017 Plastics - Determination of thermal conductivity and thermal diffusivity - Part 1: General principles
- 2009 ISO 22007-1:2009 Plastics - Determination of thermal conductivity and thermal diffusivity - Part 1: General principles
