But "POM" covers a family of materials, not one. Homopolymer and copolymer grades behave differently, filled grades change the picture again, and a datasheet figure for one grade says little about another. Market analysts at MarketsandMarkets put India's POM market at USD 163.8 million in 2025, so sourcing choices matter to a growing number of Indian processors and OEMs.
This guide is for product designers, procurement teams and processors. It covers what POM is, POM-H versus POM-C, properties, limitations, applications, comparisons and sourcing.
Key Takeaways
- POM (acetal) is a semi-crystalline engineering thermoplastic built for precision moving parts.
- POM-H, POM-C and modified grades differ in strength, moisture uptake and process windows.
- Check chemical, UV, thermal and compliance limits before specifying.
- Validate the chosen grade in the actual assembly.
What Is POM Plastic?
Definition and terminology
POM stands for polyoxymethylene. It is also called acetal or polyacetal, and it is a semi-crystalline engineering thermoplastic made from formaldehyde-based chemistry. That crystalline structure delivers:
- High stiffness
- Predictable dimensions
- Low friction
- Strong wear resistance
"POM" is the generic family name. Manufacturers sell their own grades under brand names such as Delrin, Ultraform, Hostaform and TECAFORM, and each has its own datasheet.
How POM is produced and processed
Polymerisation produces resin pellets. Converters then process them by injection moulding or extrusion, and machine stock shapes (rods, sheets) by CNC. Check processing windows against the datasheet of the exact grade. For example, a BASF Ultraform POM-C grade lists a melt temperature of 190-230 °C and a mould temperature of 60-120 °C.
Overheating is a safety issue. The safety data sheet for a Delrin grade names formaldehyde among decomposition products and calls for local exhaust ventilation during hot processing.
Where POM fits among engineering plastics
POM sits above general-purpose plastics and below high-performance polymers such as PEEK. Choose it when precision, repeated motion and wear matter. Move to another material when temperature or chemical exposure is extreme.
POM Plastic Properties, Advantages, and Limitations
Mechanical, friction and wear properties
POM's rigidity, fatigue behaviour and low friction suit gears, bushings, bearings, rollers, cams and guides. Friction and wear are system properties, though. BASF notes that counterface, roughness, lubrication, pressure and velocity control the result, so no universal coefficient exists.
Named-grade data shows the spread:
| Property | Delrin 100P / 500P (POM-H) | TECAFORM AD natural (POM-H stock shape) | Ultraform N2320 003 AT (POM-C) |
|---|---|---|---|
| Tensile yield stress | 70 / 71 MPa | 79 MPa | 63 MPa |
| Tensile modulus | 2900 / 3100 MPa | 3400 MPa | 2700 MPa |
| Flexural modulus | Not listed | 3600 MPa | 2600 MPa |
| Melting point | Not listed | 182 °C | 166 °C |
Resin and stock-shape datasets are separate, so treat this as a guide to variation, not a ranking.
Dimensional stability and moisture
POM absorbs little moisture, but not none. TECAFORM AD natural absorbs 0.05% after 24 hours and 0.10% after 96 hours at 23 °C. Temperature, load, geometry and grade still move dimensions, so validate tolerances, wall thickness, shrinkage and long-term loading through design testing.
Thermal, electrical and chemical performance
Thermal ratings are not interchangeable. TECAFORM AD natural lists 110 °C long-term service; the Ultraform grade above lists 100 °C short-cycle service. Melting point, processing temperature and service temperature are separate quantities.
On electrical data, the Ultraform sheet gives permittivity of 3.8 at 1 MHz, and TECAFORM AD natural carries a UL 94 HB rating. Get dielectric strength and chemical compatibility from current supplier data.
Main advantages
- Smooth movement and low wear
- Precision retention and repeatable moulding
- Good machinability from stock shapes
- Lower weight, no rust and quieter operation than steel gears
- Potential to reduce external lubrication
POM can replace metal in low-to-moderate load motion parts. Delrin's own guidance notes that plastic teeth deform more under load than steel, and plastics creep more than metals under sustained stress.
Limitations and safety
- Strong acids, strong bases and oxidising agents: Delrin's design guide advises against service outside pH 4-9
- Chlorine: long-term exposure at 3-5 ppm and above is not recommended for Delrin
- Prolonged sunlight: BASF warns of gloss loss and embrittlement
- Halogenated polymer contamination in the melt can cause sudden gas formation and unsafe pressure
Before approval, qualify the part for:
- Outdoor exposure
- Impact loading
- Sterilisation
- Food contact or medical use
- Flame requirements
- Electrical compliance
POM Types and Modified Grades
POM-H versus POM-C
Neither is universally better. Mitsubishi Chemical Advanced Materials describes the split this way:
| Dimension | POM-H | POM-C |
|---|---|---|
| Mechanical performance | Generally higher | Slightly lower |
| Chemical resistance | More limited | Generally better |
| Centreline porosity in stock shapes | Greater propensity | Significantly reduced |
| Hydrolysis resistance | Reference | Improved |
This comparison is directional. Actual grades need their own property and exposure data.
Filled and modified formulations
- Glass fibre: Ultraform N2200 G23 AT shows a tensile modulus of 5000 MPa
- PTFE: Delrin 500AF and 100AF use 20% PTFE fibre for sliding applications
- Impact modified: Ultraform N2640 Z2 AT trades stiffness (2000 MPa modulus) for notched Charpy impact of 15 kJ/m² at 23 °C
- UV stabilised: Delrin 127UVE and 327UVE aim to retain properties after prolonged UV exposure
- Conductive: TECAFORM AH ELS black, a carbon-black POM-C, has surface resistivity of 10²-10⁴ ohm/sq
Each additive has trade-offs: abrasiveness, reduced toughness, altered shrinkage or changed regulatory status. Properties cannot be inherited from the unfilled grade.
Compliance and application-specific grades
Generic POM is not automatically compliant. In the US, 21 CFR 177.2470 covers POM-C and 177.2480 covers POM-H for food contact. Both carry a 250 °F use ceiling that is a legal limit, not a mechanical rating. EU Regulation 10/2011 governs composition and migration.
Medical portfolios, such as Delrin's SC6## and PC6## designations, add USP Class VI and ISO 10993 testing, but that does not extend to standard 100P or 500P. ISO 29988-1:2019 is the relevant designation standard. Confirm any BIS requirement with your regulator or customer; a POM-specific mandate is not clearly set out in public standards.
Ask for certificates, declarations of compliance, lot traceability, datasheets, safety data sheets and application-specific test results.
Applications of POM Plastic
Automotive and mobility
BASF documents POM in parts such as:
- Fuel-module flanges, fuel pumps and filter housings
- Roll-over valves and level gauges
- Head-rest guides and safety-belt mechanisms
Delrin 300TE is used in Autoliv safety-belt retractor bearing plates. Check under-hood temperature, fuel compatibility, impact and flame requirements per component.
Industrial machinery and automation
POM is chosen for low friction and reliable tolerances in:
- Gears and bearings
- Valves and impellers
- Thread guides and conveyor links
Service life depends on load, speed, lubrication, mating material and temperature.
Electrical and electronics
POM appears in functional and drive parts, clips, fasteners and plug-in connectors. That does not mean it suits wire or cable insulation. Flame-retardant, conductive or antistatic needs call for specialised grades.
Healthcare, food and packaging equipment
Hostaform MT is documented in injection pens, autoinjectors, inhaler components, dose counters and patch pumps. For food, Ensinger offers order-certified TECAFORM AH natural. Contact with food, medicines or the body demands a qualified formulation and documentation.
Consumer and other sectors
| Application | Why POM |
|---|---|
| Sliders, zippers | Low friction |
| Guides, wear strips | Wear resistance |
| Precision housings | Dimensional stability |
| Handles, knobs, appliance mechanisms | Rigidity and finish |
POM Compared with Delrin, Nylon, and Other Materials
Is POM the same as Delrin?
No. POM is the generic family; Delrin is a brand that is POM-H. TJC completed its acquisition of Delrin on 1 November 2023. Before substituting any grade, compare the exact resin, polymer type, additives, certifications, colour and datasheet.
POM versus nylon
Matched stock-shape data shows TECAMID 6 natural absorbing 0.3% and 0.6% water after 24 and 96 hours, against 0.05% and 0.10% for TECAFORM AD natural.
Nylon's strengths are impact and toughness. Its long-term rating of 100 °C compares with 110 °C for the POM shape, so neither material ranks as universally better.
Choose POM for precision, low-moisture, low-friction parts. Choose nylon where toughness and impact matter more.
POM versus metals
POM wins on weight, corrosion resistance, noise and electrical insulation. Metal wins on load capacity, heat and thermal transfer. Use POM for low-to-moderate load motion parts.
POM versus other plastics
- PP/PE: low density, low water absorption, chemical resistance; POM adds rigidity, sliding and dimensional stability
- ABS: amorphous with high impact strength; POM has better sliding and wear behaviour
- PTFE: 22 MPa tensile strength and 260 °C service against 79 MPa and 110 °C for TECAFORM AD (different test methods)
- PEEK: component use up to 250-260 °C, at higher cost
Selection framework
| Question | Why it matters |
|---|---|
| Load and speed? | Sets stiffness and creep needs |
| Friction or wear critical? | Points to POM or PTFE-filled grades |
| Chemicals, moisture, UV? | May rule out POM-H or standard grades |
| Food or medical contact? | Needs certified grade |
| Electrical or flame needs? | Needs specialised grade |
Whatever the answers, test the chosen grade in the real assembly with mating materials, lubrication, temperature cycling and chemical exposure.
How to Select and Source POM for Production
Define requirements first
Document operating and commercial needs before you compare grades:
- Load, speed, friction, wear and impact
- Temperature, humidity, UV and chemical exposure
- Electrical needs, colour and tolerances
- Regulation, volume and target life
Then use datasheets, prototypes and a design-for-manufacturing review, not price or trade name alone.
Plan processing and quality controls
- Keep walls uniform; Delrin notes sections above 6-8 mm are hard to pack through crystallisation
- Vent moulds adequately to avoid burn marks
- Respect residence time: up to 10 minutes pigmented, 20 minutes natural for standard Delrin
- Dry only when moisture exceeds 0.2% or packaging was compromised (2-4 hours at 80 °C)
- Control regrind; 3:1 virgin to regrind is a common in-process ratio, not evidence of recyclability
Confirm lot consistency through certificates, batch traceability, incoming inspection and agreed acceptance criteria. A conformity certificate is not automatically a certificate of analysis with measured results.
Source for continuity and scale-up
Weigh formulation consistency, lead times, alternate sources, documentation, capacity and logistics. Avoid unsupported recyclability claims.
Where POM sits inside a wider advanced polymer requirement, Distil can help. Distil is an R&D-led specialty chemicals platform: Dr. Leema Joseph leads technical trials, a unified quality system targets process drift, and teams get visibility across production and supply chain from lab to scale. Contact Distil to discuss a specific application.
Choose the grade only after comparing operating environment, processing method, compliance needs, total cost and validated production performance.
Frequently Asked Questions
Is POM material expensive?
Usually more than commodity plastics. It can offset that through lower wear, better precision and longer life. Compare grade, additives, volume, processing, tooling and lifecycle cost rather than a quoted per-kg price.
What is POM material?
POM is polyoxymethylene, an acetal engineering thermoplastic valued for strength, low friction, wear resistance and dimensional stability.
Is POM the same as Delrin?
No. POM is the generic family; Delrin is a trade name for specific POM-H grades. Check the exact datasheet before substituting.
Is POM the same as nylon?
No. They differ in moisture uptake, friction, toughness, dimensional behaviour, chemical resistance and temperature performance.
What are the main uses of POM plastic?
Gears, bushings, bearings, rollers, automotive mechanisms, electrical components, packaging machinery and appliance parts.
Can POM be used outdoors or at high temperatures?
Standard POM is limited by UV and sustained heat. UV-stabilised grades help, but verify against your temperature, weathering and safety requirements.
