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
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Scope
Defines the method for determining non-volatile residues in industrial fluorinated hydrocarbons, focusing on sample evaporation and residue quantification.
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Test Principle
The test portion is evaporated under specified conditions using specialized apparatus. The residue remaining after evaporation represents the non-volatile content.
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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
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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.
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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.
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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.
Open preview (PDF)Fluorinated hydrocarbons for industrial use — Determination of non-volatile residue
