ISO 5789:1979 PDF

Overview

ISO 5789:1979 specifies a standardized method for the determination of non-volatile residue in fluorinated hydrocarbons used in industrial applications. This international standard ensures the precise measurement of residue contents by employing evaporation of a test sample under controlled conditions, followed by the accurate weighing of the residue left behind. Developed by ISO Technical Committee ISO/TC 47 on Chemistry, this method provides a reliable basis for quality control and safety assessments in industries utilizing fluorinated hydrocarbons.

The standard is critical where eliminating non-volatile impurities is necessary, ensuring fluorinated hydrocarbons meet purity requirements essential for their functionality and regulatory compliance.

Key Topics

• Scope Defines the method for determining non-volatile residues in industrial fluorinated hydrocarbons, focusing on sample evaporation and residue quantification.

• Test Principle The test portion is evaporated under specified conditions using specialized apparatus. The residue remaining after evaporation represents the non-volatile content.

• Apparatus Used

  • Jacketed glass container with a ground glass stopper and a 500 ml graduation for sample containment
  • Detachable glass element for holding the test portion during evaporation
  • Electric oven controlled at 105 ± 2 °C for drying components
  • Heating device such as a water bath or small electric oven to ensure uniform evaporation

• Procedure Summary The detachable element is dried and weighed, then connected to the glass container filled with the sample to a marked volume. Heating is applied uniformly until complete evaporation (1.5 to 2 hours), followed by drying and precise reweighing to determine residue mass.

• Result Expression Non-volatile residue is expressed in milligrams per kilogram (mg/kg) of the sample using a defined calculation based on the mass difference before and after evaporation.

• Test Reporting The standard mandates comprehensive reporting, including:

  • Sample identification
  • Method reference
  • Test results and units
  • Observations during testing
  • Any deviations or optional operations performed

Applications

ISO 5789:1979 is essential for companies and laboratories involved in the production, quality control, and safety assessment of fluorinated hydrocarbons used in diverse sectors such as:

• Refrigeration and air conditioning
• Fire suppression systems
• Electronics manufacturing (cleaning solvents)
• Chemical intermediates and raw materials
• Environmental monitoring of halogenated hydrocarbon purity

This standardized residue determination assists in verifying product purity, maintaining regulatory compliance, and ensuring chemical performance and safety in industrial processes.

Related Standards

• ISO 3427 – Gaseous halogenated hydrocarbons (liquefied gases) – Sampling method, which complements ISO 5789 by specifying sample collection procedures for testing fluorinated hydrocarbons.
• Other ISO standards covering chemical analysis, sampling methods, and purity assessment for industrial chemicals and solvents.
• Industry-specific guidelines on the handling and testing of halogenated solvents and refrigerants.

Keywords: ISO 5789, fluorinated hydrocarbons, non-volatile residue determination, industrial use, chemical analysis, halogenated hydrocarbons, residue testing method, quality control standards, evaporation method, ISO standards for chemicals.