ISO ASTM 52900 additive manufacturing vocabulary explained

Summary

ISO ASTM 52900 additive manufacturing vocabulary is the joint ISO/ASTM terminology standard for naming AM processes and related concepts consistently. ISO lists ISO/ASTM 52900:2021 as the current published edition and shows it confirmed in 2025, and the standard helps readers separate the seven formal process categories from looser market language. [1] [4]

ISO/ASTM 52900 at a glance

If you only need the quick-reference version, these are the main points.

• ISO lists ISO/ASTM 52900:2021 as Edition 2, published in November 2021 and confirmed as current in 2025. [1]
• The document establishes and defines terms used in additive manufacturing and classifies them into specific fields of application. [1]
• It is a vocabulary standard, not a machine specification or process-qualification rulebook. [1] [4]
• The preview states that there are no normative references, so it should not be treated as a performance, acceptance, or certification standard. [4]
• Purchased AM parts requirements are handled in ISO/ASTM 52901, while industrial AM process and production-site qualification is handled in ISO/ASTM 52920. [7] [8]
• The seven process categories in the 2021 edition are binder jetting (BJT), directed energy deposition (DED), material extrusion (MEX), material jetting (MJT), powder bed fusion (PBF), sheet lamination (SHL), and vat photopolymerization (VPP). [4]
• ISO shows the 2015 edition as the previous version, with the 2021 edition now serving as the current reference. [1]

What is ISO/ASTM 52900:2021 (and what it is not)?

ISO/ASTM 52900:2021 is the joint ISO/ASTM vocabulary standard for additive manufacturing. On the ISO listing, it appears as Edition 2 with status Published and a publication date of November 2021, and ISO also notes that it was reviewed and confirmed in 2025. ISO shows ISO/ASTM 52900:2015 as the earlier edition, with the 2021 edition now serving as the active reference. In practice, a vocabulary standard gives engineers, suppliers, QA teams, and technical writers a shared set of terms and fields of application so process names and related AM language are used more consistently across documents. [1]

Just as important, it does not set requirements. The preview states that there are no normative references in the document, which is a clear boundary marker: this is not a qualification standard, performance or tolerance standard, test-method document, or acceptance, safety, or regulatory rulebook. It helps you name things correctly; it does not show that a machine, process, or part meets a requirement. [4]

• Use ISO/ASTM 52900 when you need to name additive manufacturing process categories and related terms consistently. [4]
• Use ISO/ASTM 52900 when you need to reduce ambiguity between standards language, legacy wording, and vendor labels. [3] [4]
• Use ISO/ASTM 52900 when you need reports, procurement notes, or internal specifications to share the same vocabulary base. [1] [4]
• Use ISO/ASTM 52900 when you need to decide whether a sentence is only defining a term or should point to another standard for requirements or qualification. [7] [8]

Why this vocabulary exists: ambiguity, trademarks, and standards alignment

The introduction explains the problem the standard was meant to solve: additive manufacturing developed with many overlapping labels, application-specific phrases, and trademark-linked names. That made it harder for organizations in different sectors or countries to tell whether they were discussing the same process family, a subtype, or a brand label. ISO/ASTM 52900 addresses that problem by providing clearer definitions and a more stable vocabulary base for worldwide communication. That matters in standards work, procurement language, technical articles, test planning, and cross-supplier discussions, where a small wording shift can change what process is actually being described. [3]

The joint name also reflects how the document was developed. The foreword states that it was prepared by ISO/TC 261 in cooperation with ASTM Committee F42 and in collaboration with CEN/TC 438 under the ISO-CEN Vienna agreement. ISO/TC 261 itself has a broader remit than terminology alone: its scope includes AM processes, terms and definitions, process chains, test procedures, quality parameters, supply agreements, and fundamentals. That places ISO/ASTM 52900 inside a wider standards ecosystem rather than as a standalone document. [3] [5]

“Additive manufacturing” vs “3D printing” in ISO/ASTM 52900 terms

In ISO/ASTM 52900, additive manufacturing is defined around joining materials to make parts from 3D model data, usually layer by layer, with an explicit contrast to subtractive and formative manufacturing methods. The definition is intentionally broad: it sets the umbrella concept first, then the rest of the standard sorts AM into process families and related term groups. The preview also shows that the standard acknowledges older vocabulary still found in papers and supplier literature, including historical synonyms such as solid freeform fabrication and freeform fabrication. That helps explain why legacy documents can describe familiar AM ideas without using today’s preferred category names. [4]

The entry for “3D printing” is narrower. In the preview, it is tied to deposition using a print head, nozzle, or related printer technology, and the note says the term is often used non-technically as a synonym for additive manufacturing, especially around non-industrial or personal-use machines. So is ISO/ASTM 52900 the standard glossary for 3D printing? It is best treated as a primary terminology reference for the AM field, while recognizing that whether a project must follow it depends on the contract, specification, or regulatory context around that project. [4] [1]

How the standard is organized (without reproducing the glossary)

The official preview shows that the document is organized by major term families rather than as one flat word list. Clause 3 starts with General terms and Process categories, then moves into Processing: general, Processing: data, Processing: positioning, coordinates and orientation, and Processing: material. The preview also shows process-specific sections and parts-related sections, including general, applications, properties, and evaluation, followed by Annex A and Annex B. That structure matters because it separates core field vocabulary from workflow language, data language, process-family language, and part-related language. [3]

For this article, that organization sets a boundary as much as a roadmap. The goal here is to explain what kinds of terms the standard covers and how to use them correctly, not to reproduce the glossary itself. ISO’s listing and preview materials make clear that the standard is a copyrighted document, so the examples below are limited to definitions and headings visible in the cited previews and paraphrased at a high level. [1] [3] [4]

Examples of term families you will see referenced in and around the standard include:

• General AM and process-family terms. [3]
• Build-related and support-related terms. [4]
• Data terms such as AMF, STL, and STEP. [4]
• Parts-related language and annex material beyond the category list. [3]

The seven additive manufacturing process categories

In ISO/ASTM 52900, the seven additive manufacturing process categories are top-level families used to organize AM methods by their underlying process approach, not by brand or marketing label. Market and vendor names may describe a subtype, energy source, material set, or trademark, so mapping to ISO/ASTM categories is sometimes approximate. That is why the standard category should come first in technical writing and the market name, if needed at all, should come second as context rather than as the formal process name. [4] [14]

The short forms BJT, DED, MEX, MJT, PBF, SHL, and VPP are not casual shorthand here; the foreword says abbreviations for the seven categories were added in the 2021 revision. The same seven-family scheme also appears in recent scholarly review literature, but that does not make every market acronym a standards term. [3] [4] [17]

Rightmost column contains market labels, not standardized synonyms. [4] [14] [15] [16]

Standard terms vs market terms: five common traps

The safest house style is simple: write the ISO category first, then add the market, legacy, or vendor term in parentheses only if it helps the reader connect your wording to catalogs, quotes, or internal shop language. Never let a trademark stand in as if it were the standards category. Market and vendor names may describe a subtype, energy source, material set, or trademark, so mapping to ISO/ASTM categories is sometimes approximate. The point is not to police language; it is to avoid implying a one-to-one equivalence that the standard does not make. [4] [14] [16]

Material extrusion is the clean category name to use when you want the standards term. If a familiar market label genuinely helps the audience, a safer phrasing is “material extrusion (often called FDM in the market).” That keeps the formal category intact while still acknowledging common usage. Stratasys identifies FDM as a trademark, which is exactly why “FDM is the ISO category” is the wrong way to write it in a specification, article, or QA note. [4] [16]

The same boundary issue appears in resin and powder-bed language. Formlabs describes stereolithography as vat photopolymerization or resin 3D printing and discusses DLP and MSLA as resin-process variants distinguished by how light is delivered, which is useful market context but not the same as saying those labels replace the ISO category VPP. HP’s MJF wording is an even stronger reminder to be careful: on one part of its process guide, HP places MJF inside the PBF discussion, and elsewhere on the same page it describes MJF as a combination of powder bed fusion and binder jetting technologies. That nuance should be reported as vendor wording, not as an ISO/ASTM 52900 definition. [15] [14]

Language to avoid:

• “FDM is an ISO category.” [16]
• “MJF is defined by ISO/ASTM 52900.” [14]
• “SLA equals VPP.” [15]
• “SLS, SLM, and DMLS are official ISO category names.” [4] [14]
• “Any vendor term maps one-to-one to an ISO category.” [4] [14]

“Build volume” and other terms readers confuse

Readers often blur together machine-space terms that the standard keeps distinct. In the previewed entries, build volume is the total usable volume available in the machine for building parts, while build platform is the base that provides the surface on which building starts. Those are related ideas, but they are not interchangeable: one is the usable build region, the other is the starting surface. In day-to-day conversation, both may get collapsed into broader chamber or envelope language, which is exactly why a shared vocabulary helps when a drawing note or machine specification has to be precise. [4]

The same applies to support and build cycle. The preview defines support as a separate structure created to anchor the part during building and typically removed afterward, and it defines build cycle as the sequence of operations that makes up one build. Keeping those terms separate helps writers avoid mixing machine-space language, workflow language, and part-handling language in the same sentence. [4]

Data terms (AMF, STL, STEP): what ISO/ASTM 52900 can clarify

ISO/ASTM 52900 is not only about machines and process names; it also touches the data chain. In the preview, AMF is described as a model-data file format that can carry geometry plus attributes such as color, material, lattices, textures, constellations, and metadata. That makes AMF more than a bare shape container in the standard’s vocabulary. If you need the implementation specification rather than the vocabulary entry, ISO directs readers to ISO/ASTM 52915:2020 for AMF v1.2, and the ISO committee listing shows that standard as confirmed in 2026. [4] [11]

The same preview also includes STL and STEP entries at a high level. STL is described around tessellated triangles, while STEP is identified as a standard for the exchange of product model data. The practical takeaway is modest but important: file-format terms belong in the communication chain, not in the proof chain. Choosing AMF, STL, or STEP can affect how geometry and related information are exchanged, but the file name alone does not establish acceptance criteria, qualification status, or part performance. [4]

How to use ISO/ASTM 52900 in writing, procurement, and documentation

For writing, procurement, and documentation, the standard works best as a naming discipline. Start with the formal category so everyone can anchor the sentence to the same process family, then add only the extra context the reader actually needs. That approach is especially useful when a supplier quotation uses a platform label, a drawing note uses a process family, and a QA document needs build-related terms such as support or build cycle to mean the same thing across all three documents. Category-first wording does not solve every technical dispute, but it removes a common source of avoidable ambiguity. [4]

This is communication guidance, not legal, contractual, certification, or regulatory advice.

1. Identify the ISO category first, and add the abbreviation if it helps the document stay compact, such as PBF, VPP, or MEX. [4]
2. Add the market or vendor term in parentheses only if it helps readers map your wording to catalogs or quotations, and do not let that label replace the category name. [4] [16]
3. Use build-related terms consistently in the same document set, especially build volume, build platform, support, and build cycle, and add post-processing wording only when the document actually needs it. [4]
4. Route requirements language to the correct adjacent document: ISO/ASTM 52901 for purchased AM parts, ISO/ASTM 52920 for industrial process and production-site qualification, ISO 17295:2023 for positioning and orientation, ISO/ASTM 52915:2020 for AMF implementation, and ASME Y14.46-2022 for product-definition context. [7] [8] [10] [11] [12]
5. If one sentence mixes a process name, a file format, and a qualification claim, split it into separate statements before publication or release. [4] [7] [8]

What ISO/ASTM 52900 does not tell you

Vocabulary alignment does not equal evidence about accuracy, precision, tolerance capability, layer thickness, surface finish, acceptance criteria, qualification status, or regulatory compliance. ISO/ASTM 52900 helps define terms so a team can talk about a process clearly, but the preview’s statement that there are no normative references is a strong sign that this is not where you look for test methods, pass-fail limits, or production-control requirements. If your question is about purchased-part requirements, ISO/ASTM 52901 is the closer fit. If it is about industrial process and site qualification, look to ISO/ASTM 52920. If it is about operation and production control for metal PBF in critical applications, look to ISO/ASTM 52904:2024. For positioning and orientation, use ISO 17295:2023, and for AM product-definition guidance use ASME Y14.46-2022. [4] [7] [8] [9] [10] [12]

Where ISO/ASTM 52900 fits in the AM standards ecosystem

ISO/ASTM 52900 sits near the vocabulary layer of AM standards, not at the edge of all AM standardization. ISO/TC 261’s scope spans processes, terms and definitions, process chains, test procedures, quality parameters, supply agreements, and fundamentals, which is why nearby documents handle jobs that 52900 intentionally does not. Read that way, 52900 functions like shared infrastructure: it gives later standards a consistent language for naming processes, parts, and related concepts, while leaving detailed requirements, controls, and evaluation methods to more specialized documents. [5] [1]

For most readers, the practical question is not “What other AM standards exist?” but “Which one should I open next?” If your problem is purchased-part requirements, site qualification, metal PBF control, positioning and orientation, AMF implementation, or product-definition data, there are more specific starting points. ISO also makes the handoff explicit in at least one case: the withdrawn ISO/ASTM 52921:2013 listing points readers to ISO 17295:2023 as the new version for positioning, coordinates, and orientation. [7] [8] [9] [10] [11] [12] [6]

Outside formal standards, NIST describes AM-Bench as a continuing series of highly controlled benchmark tests for additive manufacturing, which is a useful reminder that benchmarking activity exists beyond vocabulary documents. [13]

Conclusion: why ISO ASTM 52900 additive manufacturing vocabulary matters

ISO ASTM 52900 additive manufacturing vocabulary matters because it reduces ambiguity where AM writing often breaks down: process names, vendor labels, and related technical terms that sound similar but do not mean the same thing. The standard gives a common seven-category language and other terminology anchors that make cross-vendor communication easier, while also signaling when a reader should move on to requirements, qualification, orientation, or product-definition standards instead. Used that way, ISO/ASTM 52900 is not a substitute for the rest of the AM standards ecosystem; it is the vocabulary base that helps the rest of that ecosystem stay coherent. [3] [4] [7]

FAQ

What is ISO/ASTM 52900:2021?

ISO/ASTM 52900:2021 is the current ISO-listed edition of the joint ISO/ASTM AM vocabulary standard. ISO lists it as Edition 2, published in November 2021, and confirmed in 2025, so it is the reference document to open when you need standardized additive manufacturing terms and definitions rather than machine requirements or qualification rules. [1]

Is ISO ASTM 52900 the standard glossary for 3D printing?

It is best described as a primary terminology reference for additive manufacturing, including the boundary between formal AM language and the looser way “3D printing” is often used in everyday conversation. The previewed text treats “3D printing” more narrowly than “additive manufacturing,” so the document is highly relevant to 3D printing terminology without being a catch-all for every casual market use of that phrase. [4] [1]

What are the seven process categories in ISO/ASTM 52900, and what do BJT, DED, MEX, MJT, PBF, SHL, and VPP mean?

The seven categories are binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination, and vat photopolymerization. Their 2021 abbreviations are BJT, DED, MEX, MJT, PBF, SHL, and VPP, and they are labels for process families rather than brand names or guaranteed matches to every vendor term used in brochures or quotations. [4] [3]

Why does ISO/ASTM 52900 have no normative references, and what does that imply?

The preview explicitly says there are no normative references in the document, which is a strong clue about its role. It tells you the standard is supplying terminology, not test methods, qualification logic, or acceptance criteria, so if your question is “What counts as compliant or qualified?” you need an adjacent standard rather than 52900 alone. [4] [7] [8]

How do FDM/FFF, SLA/DLP/MSLA, SLS/SLM/DMLS, and MJF relate to ISO/ASTM 52900 categories?

Treat those as market, legacy, or vendor labels that must be mapped carefully. FDM should not replace MEX because Stratasys states FDM is a trademark; SLA, DLP, and MSLA are common resin-process labels discussed under VPP; SLS, SLM, and DMLS are commonly discussed under PBF; and HP’s own wording shows MJF should be handled cautiously rather than treated as an ISO-defined category. [4] [14] [15] [16]

What does ISO/ASTM 52900 mean by single-step vs multi-step processes?

The preview distinguishes single-step and multi-step processes within AM terminology, which helps classify how a manufacturing route is described. It also notes that support removal and cleaning are not counted as separate process steps in that context, so the distinction is narrower and more technical than the casual way people sometimes talk about “extra steps” after a build. [4]

Which standards should you look at after 52900 for purchased parts, qualification, orientation, or drawings?

For purchased AM parts, start with ISO/ASTM 52901. For industrial process and production-site qualification, use ISO/ASTM 52920. For positioning, coordinates, and orientation, use ISO 17295:2023, which replaced ISO/ASTM 52921:2013. For AM product-definition guidance in drawings and related documents, use ASME Y14.46-2022. [7] [8] [10] [6] [12]

Sources

1. ISO — ISO/ASTM 52900:2021 standard page (official listing).
2. ASTM Store — ISO/ASTM52900-21 / F3177-21 listing (DOI/pages/update).
3. ANSI Webstore preview PDF — ISO/ASTM 52900:2021 (ToC, foreword, intro).
4. iTeh preview PDF — ISO/ASTM 52900:2021 sample (definitions visible).
5. ISO — ISO/TC 261 committee page (scope + working groups list).
6. ISO — ISO/ASTM 52921:2013 (withdrawn; points to ISO 17295:2023).
7. ISO — ISO/ASTM 52901:2017 (purchased AM parts requirements).
8. ISO — ISO/ASTM 52920:2023 (industrial process/site qualification requirements).
9. ISO — ISO/ASTM 52904:2024 (metal PBF process characteristics/performance for critical applications).
10. ISO — ISO 17295:2023 (positioning/coordinates/orientation; replaces 52921).
11. ISO (committee) — ISO/ASTM 52915:2020 (AMF v1.2 specification).
12. ANSI Webstore — ASME Y14.46-2022 listing (product definition for AM).
13. NIST — Additive Manufacturing Standards page (AM-Bench + standards efforts context).
14. HP — “A guide to 3D printing processes” (vendor examples + MJF nuance).
15. Formlabs — “Guide to Stereolithography (SLA) 3D Printing” (SLA/DLP/MSLA framing).
16. Stratasys — Legal information (FDM trademark statement).
17. Kokare et al. (2023) — Life cycle assessment of additive manufacturing review.