ISO 1124:1988

Overview

ISO 1124:1988 (Third edition) specifies standardized procedures for sampling carbon black used as a rubber compounding ingredient. Intended for the rubber industry, the standard covers sampling from bulk, semi-bulk and package deliveries and defines apparatus, minimal sample sizes, handling and reporting to ensure representative, traceable samples for quality assessment.

Key Topics

• Scope and definitions

  • Bulk: containers holding not less than 2 000 kg.
  • Semi-bulk: containers holding more than 50 kg and less than 2 000 kg.
  • Packages: containers of 50 kg or less.

• Required apparatus

  • Sample Splitter: single-stage riffle-type splitter for reducing portions without bias.
  • Sampling device for packages: open tube with a seal lip, diameter not less than 25 mm, to reach the package geometric centre.
  • Scoop: designed to minimize pellet breakdown when removing sample material.
  • Airtight containers: minimum capacity 3 dm3 for storage of retained samples.

• Sampling quantities and procedure highlights

  • For bulk compartments: discard at least 5 dm3 from each sampling port, then take at least 1 kg or 3 dm3 from each port and place in an airtight container.
  • If no sampling ports are fitted, take 1 kg or 3 dm3 from loading ports approximately 30 mm below the surface to avoid contamination.
  • For packages: insert the sampling tube to the geometric centre, discard about 0.5 dm3, then take at least 1 kg or 3 dm3; alternatively use the scoop after removing the top 30 mm of surface material.
  • When preparing laboratory test samples, pass individual samples through the riffle-type splitter at least twice; composite samples should be passed at least three times to reduce stratification.

• Handling and storage

  • Handle sample portions carefully to prevent pellet breakdown.
  • Store samples in airtight containers until testing; retain individual or composite portions as required.

Applications

• Establishing representative test samples for incoming carbon black shipments.
• Supporting quality control and material acceptance procedures in rubber compounding and manufacturing.
• Providing traceable, auditable sampling records for supplier verification and dispute resolution.

Related Standards

• This document was prepared by ISO/TC 45 (Rubber and rubber products) and is the third edition, replacing the second edition (ISO 1124:1983).

• When implementing ISO 1124:1988, consider cross-referencing other ISO standards on material sampling and laboratory testing procedures relevant to carbon black or rubber ingredient analysis.

Practical value: ISO 1124:1988 provides clear, repeatable sampling steps and reporting requirements so laboratories and quality teams can obtain representative samples, reduce variability from poor sampling, and maintain traceable records for shipment acceptance.