Overview
EN 24003:1993 (Permeable sintered metal materials - Determination of bubble test pore size) is a CEN standard that adopts ISO 4003:1977 and specifies the bubble test method for assessing pore size in sintered metal parts with interconnected porosity. The standard is intended as a quality control procedure for components such as filters, porous bearings and porous electrodes. It is explicitly not intended as a definitive method for assigning filter grades or for determining exact pore size distributions.
Key topics and requirements
- Scope: Applies to permeable sintered metal materials where porosity is interconnected (flow-through structures).
- Test method: Defines the use of the bubble (bubble-point) test principle to determine a characteristic pore size representative for QC purposes.
- Purpose: Emphasizes the bubble test as a quality control test, suitable for routine inspection and acceptance testing rather than detailed pore characterization.
- Materials covered: Filters, porous bearings, porous electrodes and other sintered metal parts produced by powder metallurgy techniques.
- Limitations: The standard states the bubble test should not be used to define filter grades or to establish exact pore size distribution - it gives a practical, comparative pore-size value.
Applications
EN 24003:1993 is useful for organizations needing a standardized, repeatable pore-size check on sintered metal products:
- Manufacturers of sintered metal filters, porous bearings, fuel filters, hydraulic components and porous electrodes who require routine production QC.
- Quality control laboratories conducting batch acceptance, in-process checks, or final inspection.
- R&D and process engineering groups that need a simple comparative method to monitor manufacturing changes or sintering process adjustments.
- Supply chain and purchasing teams who require a standard test definition for contract or conformity verification.
Practical benefits include faster acceptance testing, straightforward correlation between batches, and a standardized approach to detecting gross changes in average pore size or permeability during production.
Related standards
- ISO 4003:1977 - the international method on which EN 24003:1993 is based.
- Other standards on porous media testing and filter classification may be used in combination when a detailed pore size distribution or specific filter grading is required (consult relevant ISO/CEN documents for full characterization methods).
Keywords: EN 24003:1993, permeable sintered metal materials, bubble test, pore size determination, sintered metal filters, quality control, ISO 4003:1977, powder metallurgy.