Name: ISO 8841:1991 — Dense, shaped refractory products — Determination of permeability to gases
SKU: ISO 8841:1991
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ISO 8841:1991 PDF — Dense, shaped refractory products — Determination of permeability to… — GOST Standards

Scope and Applicability ISO 8841 applies to dense, shaped refractory products and describes a test method focused on gas permeability, a critical parameter related to pore distribution and material texture rather than mere porosity or density.
Test Principle The standard bases the permeability measurement on Darcy’s Law and Hagen-Poiseuille equation, involving the passage of dry gas-typically air-through a cylindrical test piece while recording the pressure drop and flow rate.
Test Apparatus The setup includes:
- Gas supply system (under pressure or suction)
- Test piece holder with gas-tight seals
- U-tube liquid manometer for precise pressure drop measurement
- Floating flowmeters for measuring gas flow rates
- Drying oven for sample preparation
- Vernier calipers for accurate dimensional measurements
Test Pieces Test samples should be cylindrical refractory specimens with strict dimensional tolerances (diameter and height of 50 mm ± 0.5 mm). Preparation includes cutting away material layers near faces and drying to constant mass at controlled temperature.
Testing Procedure Key steps include:
- Conducting a blank test using an impermeable dummy to verify equipment tightness
- Measuring test piece dimensions precisely
- Securing the test piece in the holder with inflated rubber membranes for gas-tight sealing
- Passing dry gas at multiple flow rates and recording the corresponding pressure drops
- Calculating permeability values and verifying linear proportionality between flow and pressure difference
Expression of Results Permeability is expressed in square metres (m²) or square centimetres (cm²), calculated using measured flow rates, pressure drops, gas viscosity, and sample dimensions. The method includes correction factors accounting for water vapor removal and gas properties at testing temperatures.
Reporting Requirements Comprehensive reporting must include identification of the testing body, date, standard reference, detailed material description, test conditions, gas type, flow and pressure data, mean permeability values, and any notable variability or deviations.

ISO 8841:1991 PDF

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