SIST EN ISO/ASTM 52924:2023 PDF

Overview

EN ISO/ASTM 52924:2023 - Additive manufacturing of polymers - Qualification principles - Classification of part properties defines a common system to describe and communicate the quality of additively manufactured thermoplastic polymer parts. The document establishes classes of part properties (mechanical, physical and geometrical) that can be used to specify required or achievable quality in a traceable way between providers and customers. It applies primarily to thermoplastic parts produced by thermal reaction fusion processes (typically powder bed fusion (PBF) and material extrusion (MEX)) and to other thermoplastic AM processes when process-specific topics are considered. The classification refers to parts in the as-built condition (unpacked, supports removed, prior to post‑processing).

Key topics and technical requirements

• Classification system: Defined classes for part properties to create a shared understanding of quality levels for AM polymer parts.
• Property domains: Mechanical (e.g., tensile properties), physical (e.g., relative density), and geometrical (e.g., dimensional accuracy). Further properties may be agreed between buyer and provider.
• Test specimens & build arrangement: Specified specimen geometries and positioning/orientation in the build space to determine characteristic values. CAD/STL/AMF positioning data are provided with the standard.
• Characterization methods: Procedures for determining characteristic values used to assign parts to classes - including tensile testing, dimensional metrology and density measurement.
• Labeling, orientation and distribution: Requirements for specimen labeling, orientation and grid arrangement and how distribution in the build space affects classification.
• Qualification workflow: Processes for initial classification, regular checking, and requalification after replacement of relevant machine components.
• Scope limitations: Applies to as-built parts; specific industries (aerospace, medical) may impose additional requirements beyond this classification.

Applications and intended users

• Manufacturing service providers (PBF, MEX): to declare achievable quality classes and demonstrate capability.
• Buyers and procurement teams: to specify required part-property classes in purchase orders and contracts in a traceable manner.
• Designers and engineers: to select appropriate AM processes/materials and design for required quality classes.
• Quality managers and test labs: to implement standardized test builds, determine characteristic values, and maintain regular requalification.

Related standards

• This document is part of the ISO/ASTM cooperative AM standards ecosystem and complements other additive manufacturing standards covering material specifications, process control and test methods. Users should consult industry‑specific regulations (e.g., aerospace, medical) for additional mandatory requirements.

Keywords: additive manufacturing, polymers, EN ISO/ASTM 52924:2023, PBF, MEX, qualification principles, classification of part properties, dimensional accuracy, tensile properties, relative density, as-built.