Quick answer: polyacetal, acetal, and POM are commonly used for the material family technically known as polyoxymethylene. Delrin® is not a generic material name; it is an acetal-homopolymer brand. To specify acetal rod or sheet stock, confirm the form, dimensions, grade or performance requirement, quantity, and required documentation.
What POM, acetal, polyacetal, and Delrin mean
Similar names can conceal different technical requirements. POM is the abbreviation for polyoxymethylene. Acetal and polyacetal are generic market and engineering terms for the same material family. Delrin® is a trade name, so a drawing that names it may require a particular brand or grade.
| Term | What it identifies | What to confirm before sourcing |
|---|---|---|
| POM / polyoxymethylene | The technical abbreviated name for the material family. | Grade, form, dimensions, and service conditions. |
| Acetal / polyacetal | Generic commercial and technical names commonly used for POM. | That the terms are not being used as a substitute for a required brand or grade. |
| Delrin® | An acetal-homopolymer brand. | Whether the exact brand and grade are mandatory or an approved equivalent is allowed. |
| POM-H / POM-C | Broad homopolymer and copolymer classifications. | The proposed grade’s data sheet; materials should not be assumed equivalent solely because they belong to the POM family. |
Important: POM does not mean PTFE. PTFE is polytetrafluoroethylene, a different material family with its own selection criteria.
Is Delrin material the same as POM?
Searches for “Delrin material” often seek POM for mechanical components, but the name alone does not define a valid substitution. Delrin® belongs to the POM family as an acetal homopolymer; other acetals may be copolymers or modified grades. If a drawing specifies Delrin®, clarify the brand, grade, critical properties, and whether an equivalent is acceptable.
Many applications evaluate POM for stiffness, low moisture absorption, dimensional stability, and sliding behavior. Actual performance depends on grade, geometry, load, speed, mating surface, temperature, chemical medium, and service environment.
Acetal rod, plate, or sheet: how to specify the form
The form defines the starting stock shape for later machining or fabrication; it does not confirm the material grade. An acetal rod usually describes cylindrical stock, while plate or sheet describes flat stock. Provide complete dimensions rather than only a reference such as “natural POM” or “Delrin.”
- Round rod: required diameter and length.
- Square or rectangular bar: width, height, and length.
- Plate or sheet: thickness, width, and length.
- Color: state it if your process requires it, but do not use it as proof of grade, chemical resistance, or ESD behavior.
Select the grade by application requirement
Start with the part function, not the trade name. For a standard mechanical POM evaluation, review PomDepot’s natural POM offering. If electrical control is required, do not assume that natural, white, or black acetal meets an ESD or conductive classification: evaluate POM ESD and conductive POM separately, then validate the grade against the required electrical range, test method, and service conditions.
Pause and confirm the specific grade data sheet when the application includes repeated steam or hot water, strong acids or bases, oxidizing agents, outdoor exposure, regulatory requirements, special fluid contact, or critical tolerances. A generic material name never replaces end-use validation.
Acetal sourcing checklist
- Application: describe load, movement, mating surface, temperature, moisture, chemicals, and environment.
- Required material or performance: provide the brand/grade when defined; otherwise explain whether you need POM-H, POM-C, low friction, electrical control, or another verifiable condition.
- Form: round rod, square/rectangular bar, plate, or sheet.
- Dimensions: diameter or width/height, thickness, and length; include tolerances when critical.
- Quantity: state pieces, total length, or lot requirement as applicable.
- Color and functional requirements: clarify whether color is visual only or tied to a separate technical need.
- Documentation: identify the data sheet, traceability, declaration, or standard your process actually requires.
Frequently asked questions
Are POM and PTFE the same material?
No. POM means polyoxymethylene, while PTFE means polytetrafluoroethylene. They are different materials; compare the application’s mechanical, thermal, chemical, and friction requirements before choosing.
Is Delrin the same as every acetal?
Not automatically. Delrin® is an acetal-homopolymer brand. Acetal and polyacetal are generic terms, and brands or grades can have different properties and documentation. Always confirm the grade and accepted equivalency.
What information is needed to request acetal rod?
Provide the application or requested grade, form, complete dimensions, quantity, color if relevant, and required technical documents. Include a drawing or current material data sheet when available to avoid ambiguity.
Does natural POM automatically work for an ESD application?
No. An ESD or conductive application requires a defined electrical performance, test method, and target range. Color or the word “acetal” does not prove that a grade meets that requirement.
Request material with useful information
Review the engineering plastics catalog and, once the application information is ready, share the form, dimensions, quantity, required grade or performance, and documentation through contact. That starts the conversation from a verifiable technical specification rather than only a trade name.