Overview
ISO 19983:2024 - Rubber - Determination of precision of test methods provides standardized guidance and requirements for estimating the precision of rubber test methods using interlaboratory test programmes (ITPs). The third edition defines two accepted approaches: Method A (based on ISO 5725-1, ISO 5725-2 and ISO 5725-3) and Method B (based on ASTM D4483). The standard covers design, conduct, statistical treatment, outlier handling and reporting of precision studies for rubber test methods.
Key topics and requirements
- Two methodological routes
- Method A: Uses ISO 5725 series to calculate repeatability, day-to-day repeatability, and reproducibility (suitable when within-day replicates are available).
- Method B: Uses ASTM D4483 to calculate day-to-day repeatability and reproducibility.
- Interlaboratory test programme (ITP) design: selection of representative materials, volunteer laboratories familiar with the method, and planning of days/replicates.
- Precision condition definitions:
- Repeatability - independent results in the same lab, same operator, same equipment within short intervals (typically within a day).
- Day-to-day repeatability - same lab/operator/equipment with repeats over days (commonly 1–7 days; seven days often used).
- Reproducibility - results across different laboratories, operators and equipment.
- Statistical procedures and outputs: pooled standard deviations, variance components (repeatability, day-to-day, between-laboratory), and relative precision values.
- Outlier detection and treatment: procedures and examples (normative and informative annexes) for identifying and handling inconsistent results, including Mandel’s h and k statistics (Annex C).
- Reporting requirements: required content for precision study reports to ensure transparency and reproducibility.
- Normative and informative annexes: detailed calculation procedures for both methods, worked examples, guidance on interpretation and outlier examples.
Applications and users
ISO 19983:2024 is intended for:
- Standards developers and technical committees drafting rubber test methods.
- Testing laboratories conducting interlaboratory studies or seeking to validate method precision.
- Quality and R&D teams in rubber manufacturing and testing industries establishing measurement uncertainty and acceptance criteria.
- Accreditation bodies and proficiency-testing organizers that require standardized precision estimates.
Practical uses include establishing method performance characteristics, informing test method validation, designing ITPs, and supporting conformity assessment. Note: for commercial product acceptance, the standard cautions that product-specific precision programmes are usually required.
Related standards
Keywords: ISO 19983:2024, rubber test methods, precision, repeatability, reproducibility, day-to-day repeatability, interlaboratory test programme, ISO 5725, ASTM D4483.
