ISO 6101-5:2018

Overview

ISO 6101-5:2018 is an international standard developed by the International Organization for Standardization (ISO) that defines a method for the determination of iron content in rubber using atomic absorption spectrometry. This standard is applicable to raw rubber, latex, and rubber products with iron concentrations from 5 mg/kg to 1,000 mg/kg, with the possibility to analyze higher concentrations by adjusting test parameters. Following this standard ensures reliable, reproducible, and comparable results across laboratories and industries involved in rubber production, processing, and quality control.

Key Topics

• Scope of Application
  • Suitable for testing raw rubber, latex, and various rubber products.
  • Standard covers a broad iron content range: 5 mg/kg to 1,000 mg/kg.
• Analytical Principle
  • A sample is ashed to remove organic material, and the residual inorganic content is dissolved using hydrochloric acid or nitric acid.
  • The resulting solution is analyzed with an atomic absorption spectrometer, measuring iron content at specific wavelengths (248.3 nm for low concentrations, 372.0 nm for higher concentrations).
• Preparation and Calibration
  • Strict guidelines for sample preparation, ashing, and solution dilution are detailed to ensure consistency.
  • Calibration is performed using standard iron solutions and the creation of calibration curves.
• Precision and Accuracy
  • The method is validated with inter-laboratory tests, ensuring high repeatability and reproducibility.
  • Use of blank determinations and the standard addition method improves reliability, especially for samples with complex matrices.

Applications

This standard is particularly valuable for:

• Quality Assurance in Rubber Manufacturing
  • Enables manufacturers to control and monitor iron impurities in raw materials and finished products, directly influencing product quality and performance.
• Regulatory Compliance and Reporting
  • Provides a recognized methodology for meeting national and international requirements regarding the presence of metals in rubber.
• Research and Product Development
  • Supports research teams in developing new rubber formulations and ensuring that iron levels remain within acceptable limits to achieve desired mechanical and chemical properties.
• Laboratory Testing and Third-Party Certification
  • Standardizes testing procedures for laboratories offering analytical services to the rubber industry, facilitating comparative studies and certification processes.

Related Standards

For a comprehensive approach to rubber analysis, consider the following related ISO standards:

• ISO 123: Rubber latex - Sampling
  • Essential for obtaining representative latex samples for iron determination.
• ISO 124: Latex, rubber - Determination of total solids content
  • Supports sample preparation and validation for analytical procedures.
• ISO 247-1: Rubber - Determination of ash - Combustion method
  • Describes the ashing procedure referenced in ISO 6101-5:2018.
• ISO 648: Laboratory glassware - Single-volume pipettes and ISO 1042: Laboratory glassware - One-mark volumetric flasks
  • Referenced for accurate measurement and sample handling.
• ISO 1795: Rubber, raw natural and raw synthetic - Sampling and further preparative procedures
  • Additional guidance on sampling techniques for raw rubber materials.
• ISO/TR 9272 and ISO 19983: Determination of precision for test method standards
  • Complementary documents on method validation and statistical analysis.

Practical Value

By implementing ISO 6101-5:2018, organizations in the rubber industry gain:

• Improved product quality and consistency.
• Enhanced credibility in regulatory and customer audits.
• Streamlined laboratory operations with harmonized procedures.
• Greater confidence in reported iron content results, minimizing the risk of product failures due to metal contamination.

For more information or to purchase the full text, visit the official ISO website.