Overview
ISO 1014-2:2025 - "Coke - Part 2: Determination of true relative density" specifies a laboratory method to determine the true relative density of coke (relative to water). The procedure uses a 50 ml pycnometer and distilled water, with air removed by boiling, to measure the volume displaced by a known mass of dry, ground coke (212 µm top size). Results are reported to 0.01 (dimensionless). The document is intended for quality control and analytical laboratories working with coke and related products.
Key Topics and Requirements
- Scope and principle
- Measure mass of water displaced by a known mass of coke using a pycnometer; air removal by boiling; thermostatic temperature control is essential (a 1 °C difference can cause about a 0.012 error).
- Sample preparation
- General analysis sample ground to pass a 212 µm sieve (see ISO 13909-6 and ISO 18283).
- Typical test portion ≈ 5 g; drying 1 h at 105–110 °C unless material is hygroscopic (alternate moisture correction allowed).
- Apparatus
- 50 ml pycnometer, thermostatically controlled water bath (±1 °C), glycerol bath, reflux air condenser, two wash bottles, analytical balance (resolution at least 0.1% of test portion).
- Procedure highlights
- Clean and condition pycnometer in distilled water at controlled temperature; transfer accurately weighed dry coke to pycnometer; boil vigorously for 30 min with reflux to remove trapped air; refill and equilibrate to test temperature before final weighing.
- Calculation and reporting
- True relative density calculated from the masses of (a) dry coke, (b) pycnometer with water, and (c) pycnometer with coke and water. Report mean of duplicate determinations to the nearest 0.01.
- Precision
- Repeatability: duplicates in same lab by same operator should not differ by more than 0.03.
- Reproducibility: means from two different labs should not differ by more than 0.05.
- Test report must include
- Sample identification, reference to ISO 1014-2:2025, date, results and expression method.
Applications and Users
- Industrial and laboratory users who require accurate density data for:
- Coke producers and quality control labs
- Steel and metallurgical plants evaluating coke performance
- Materials testing and research institutions studying coke properties
- Regulatory bodies and certification laboratories for product specifications
- Keywords: ISO 1014-2:2025, true relative density, coke density determination, pycnometer method, coke quality control, laboratory standard.
Related Standards
- ISO 13909-6 - Preparation of test samples of coke (mechanical sampling)
- ISO 18283 - Manual sampling of coal and coke
- ISO 687 - Determination of moisture in coke (referenced for hygroscopic materials)
- ISO 3310-2 - Test sieves (perforated metal plate)
This standard provides a reproducible, instrument-based method for accurate density measurement of coke critical to material specification and process control.
