# HPM Flammable Liquid: Building Code Definition > How the IBC 2009, IFC 2009 define hpm flammable liquid, where the wording differs, and which chapters depend on the term. - Canonical: https://harth.build/resources/glossary/hpm-flammable-liquid/ - Last updated: 2026-09-07 - Data source: Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ## Key facts | Fact | Value | | --- | --- | | Defined in | IBC 2009, IFC 2009 (2009 editions transcribed in this corpus) | | Primary source | IBC 2009 Special Detailed Requirements Based on Use and Occupancy (model text, not a jurisdiction's adopted text) | | Chapters using the term | 4 (counted across the codes hosted here) | | Wording identical across codes | Yes (compare before citing one code's wording under another) | ## Direct answer HPM flammable liquid is a defined term in the International Building Code (IBC) 2009, in Special Detailed Requirements Based on Use and Occupancy. The code's own words are: “An HPM liquid that is defined as either a Class I flammable liquid or a Class II or Class IlIA combustible liquid.” The IFC 2009 carries the same definition word for word, so the term means the same thing in each. The term is used in 4 chapters of this corpus, most often in Semiconductor Fabrication Facilities (IFC 2009), Definitions (IBC 2009), Special Detailed Requirements Based on Use and Occupancy (IBC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. *Content and cited inputs reviewed by [Scott Barrington](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.* ## What does this term mean? **HPM Flammable Liquid** — IBC 2009, Special Detailed Requirements Based on Use and Occupancy: > An HPM liquid that is defined as either a Class I flammable liquid or a Class II or Class IlIA combustible liquid. ![Labeled code-term definition diagram: HPM Flammable Liquid: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/hpm-flammable-liquid/diagram-1344.webp) *How the IBC 2009, IFC 2009 define hpm flammable liquid, where the wording differs, and which chapters depend on the term.* ## What must be verified before using this guidance? Two of the I-Codes in this corpus define **HPM Flammable Liquid**, in identical words. | Code | Where it is defined | Definition | | --- | --- | --- | | IBC 2009 | [Special Detailed Requirements Based on Use and Occupancy](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/special-detailed-requirements-based-on-use-and-occupancy.md) | An HPM liquid that is defined as either a Class I flammable liquid or a Class II or Class IlIA combustible liquid. | | IFC 2009 | [Semiconductor Fabrication Facilities](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/semiconductor-fabrication-facilities.md) | An HPM liquid that is defined as either a Class I flammable liquid or a Class II or Class IlIA combustible liquid. | ## Where hpm flammable liquid is used in the code The term appears in 4 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next. | Chapter | Code | Mentions | | --- | --- | --- | | [Semiconductor Fabrication Facilities](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/semiconductor-fabrication-facilities.md) | IFC 2009 | 4 | | [Definitions](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/definitions.md) | IBC 2009 | 1 | | [Special Detailed Requirements Based on Use and Occupancy](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/special-detailed-requirements-based-on-use-and-occupancy.md) | IBC 2009 | 1 | | [Definitions](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/definitions.md) | IFC 2009 | 1 | ## The terms HPM flammable liquid is built out of The definition above leans on 3 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what HPM flammable liquid covers: - **[Combustible Liquid](https://harth.build/resources/glossary/combustible-liquid.md)** — IBC 2009: A liquid having a closed cup flash point at or above 100°F (38°C). - **[Flammable Liquid](https://harth.build/resources/glossary/flammable-liquid.md)** — IBC 2009: A liquid having a closed cup flash point below 100°F (38°C). - **[Liquid](https://harth.build/resources/glossary/liquid.md)** — IBC 2009: A material that has a melting point that is equal to or less than 68°F (20°C) and a boiling point that is greater than 68°F (20°C) at 14.7 pounds per square inch absolute (psia) (101 kPa). ## HPM Flammable Liquid: what to open, and in what order Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) cover the middle rows. | Check | Where | Confirmed | | --- | --- | --- | | Read the definition in the adopted IBC | Special Detailed Requirements Based on Use and Occupancy | | | Read the definition in the adopted IFC | Semiconductor Fabrication Facilities | | | Re-check the requirement that uses it | Semiconductor Fabrication Facilities (IFC 2009) | | | Re-check the requirement that uses it | Definitions (IBC 2009) | | | Re-check the requirement that uses it | Special Detailed Requirements Based on Use and Occupancy (IBC 2009) | | | Re-check the requirement that uses it | Definitions (IFC 2009) | | | Confirm the dependent definition | Combustible Liquid | | | Confirm the dependent definition | Flammable Liquid | | | Confirm the dependent definition | Liquid | | | Local amendment to any of the above | Jurisdiction's amendment list | | **A research aid, not a code determination.** The authority having jurisdiction decides which edition and which amendments apply. ## Where can you explore related guidance? - [Explore all glossary guidance](https://harth.build/resources/glossary.md) - [Combustible Liquid: Building Code Definition](https://harth.build/resources/glossary/combustible-liquid.md) - [Flammable Liquid: Building Code Definition](https://harth.build/resources/glossary/flammable-liquid.md) - [Liquid: Building Code Definition](https://harth.build/resources/glossary/liquid.md) ## Sources and method Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ### Source links - [codes.iccsafe.org](https://codes.iccsafe.org/codes) - [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/) ## Frequently asked questions ### What is the code definition of hpm flammable liquid? The International Building Code (IBC) 2009 defines it in Special Detailed Requirements Based on Use and Occupancy as: “An HPM liquid that is defined as either a Class I flammable liquid or a Class II or Class IlIA combustible liquid.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally. ### Which parts of the code depend on hpm flammable liquid? In this corpus the term is used across 4 chapters, led by Semiconductor Fabrication Facilities in the IFC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fglossary%2Fhpm-flammable-liquid%2F - View this page in a browser: https://harth.build/resources/glossary/hpm-flammable-liquid/ - All resources for agents: https://harth.build/llms.txt