POM ESD
Grade
ASTM D4181 · also Delrin
ESD = carbon-black conductive / antistatic
Pick for fuel-system parts, conveyor and electronics-handling components that must dissipate static charge.
Values for the ESD condition
Other POM grades and fills
POM is listed in 10 conditions; see the grade overview at POM.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact modified | Select for snap-fits, clips and cold-climate parts needing high notched impact and ductility, at the cost of stiffness and heat resistance. | 43 | 45 | 120 | 70 Shore D |
PTFE-lubricated bearing grade | Use for unlubricated bearings, slides and gears where the lowest friction and wear rate against steel is required. | 45 | 45 | 15 | 78 Shore D |
ESDThis page Carbon-black conductive / antistatic | Pick for fuel-system parts, conveyor and electronics-handling components that must dissipate static charge. | 47 | 48 | 6 | 82 Shore D |
internally silicone-oil lubricated | Cost-effective friction and noise reduction for gears and clips where mechanicals must stay close to unfilled acetal. | 58 | 28 | 79 Shore D | |
Molybdenum disulfide filled | Dark, wear-resistant bearing grade for moderate loads where PTFE cost or FDA compliance is not required. | 58 | 60 | 15 | 82 Shore D |
High-flow / thin-wall injection grade | Use for thin-wall, multi-cavity or long-flow-path parts; higher MFR trades some toughness for fill and cycle time. | 60 | 61 | 20 | 81 Shore D |
Acetal homopolymer | Pick when maximum stiffness, strength, creep and wear resistance are needed and hot alkali/hot water exposure is limited. | 70 | 70 | 30 | 92 HRM |
10% glass fiber reinforced | Modest stiffness and dimensional-stability boost with much lower shrinkage than unfilled, while retaining some ductility. | 85 | 7 | ||
25% glass fiber reinforced | Choose for load-bearing housings, brackets and gears needing high stiffness, low creep and tight dimensional tolerance at elevated temperature. | 130 | 3 | 90 HRM | |
30% glass fiber reinforced | Maximum-stiffness acetal for structural parts; accept brittleness, abrasive wear on tools and strong shrinkage anisotropy. | 135 | 2.5 |
What is POM ESD?
POM ESD is POM in the ESD grade — pick for fuel-system parts, conveyor and electronics-handling components that must dissipate static charge. POM ESD has a yield strength of 47 MPa (6.82 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 55% of polymer grades. Elongation at break is 6% and the elastic modulus is 3.2 GPa (0.464 Msi). POM ESD has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 86% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Advantages
- Conducts heat well — 0.4 W/m·K (0.231 BTU/hr·ft·°F), better than 93% of polymer grades
- Easy to machine — 80/100, better than 84% of polymer grades
- Good UV / weathering resistance — 70/100, better than 83% of polymer grades
- Stiff — 3.2 GPa (0.464 Msi), better than 77% of polymer grades
- Polishes to a fine finish — 70/100, better than 77% of polymer grades
Limitations
- Heavy — 1.45 g/cm³ (0.0524 lb/in³), worse than 86% of polymer grades
- Needs corrosion protection — 68/100, worse than 85% of polymer grades
POM ESD properties
Typical room-temperature values for POM ESD; 30 are specific to this condition. Other listed values are POM reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
POM ESD has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 86% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Mechanical17
POM ESD has a yield strength of 47 MPa (6.82 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 55% of polymer grades. Elongation at break is 6% and the elastic modulus is 3.2 GPa (0.464 Msi).
Thermal11
POM ESD is rated for continuous service to 90°C (194 °F). It conducts heat at 0.4 W/m·K (0.231 BTU/hr·ft·°F), better than 93% of polymer grades. Thermal expansion is 110 µm/m·K (61.1 µin/in·°F).
Electrical7
POM ESD is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 100 Ω·m.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 85% of polymer grades. UV resistance is very good.
Sustainability4
Producing a kilogram of POM ESD takes about 100 MJ of energy and emits 4.5 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 0%.
Manufacturability8
POM ESD's machinability is very good (80/100, better than 84% of polymer grades); weldability fair (35/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with POM ESD
Is POM easy to machine?
One of the best plastics to machine: sharp positive-rake tools, high speed, light feeds, air or mist cooling; relieve molded-in stress before tight-tolerance finishing and expect springback-free chips.
Can POM be welded?
Hot-plate, ultrasonic, spin and vibration welding all work well; no solvent bonding — adhesive joints require plasma, flame or chromic-acid surface activation.
Can POM be formed, bent or molded?
Dry only if resin is wet (≤0.1%), melt 190–215 °C, mold 80–100 °C, generous gates and full packing; watch ~2% shrinkage, sink and voids in thick sections and never overheat/stagnate melt (formaldehyde release).
What surface finishes work on POM?
Paints and inks need surface pretreatment or special primers; parts polish to a waxy sheen, can be laser-marked, and plating requires a dedicated acetal etch process.
POM chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| ethylene oxide comonomercopolymer (POM-C) only; absent in homopolymer POM-H, which is end-capped instead | 1 – 5 | 2.5 |
| heat/acid stabilizer package (antioxidanessential to prevent depolymerization | 0.2 – 1.5 | 0.6 |
| lubricant / mold release | 0 – 1 | 0.3 |
| pigment (carbon black, TiO2 etc.)carbon black also gives UV protection | 0 – 2 | 0.5 |
| oxymethylene (-CH2O-) repeat unitpolyacetal backbone from formaldehyde/trioxane | ≥ 94 (balance) |
POM ESD — frequently asked
What is POM ESD used for?
POM ESD is typically used for gears, clips and fuel systems. In short: stiff dimensional acetal.
What is the yield strength of POM ESD?
POM ESD has a typical yield strength of 47 MPa (6.82 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 55% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is POM ESD easy to machine?
Yes — machinability is rated very good (80/100, better than 84% of polymer grades). One of the best plastics to machine: sharp positive-rake tools, high speed, light feeds, air or mist cooling; relieve molded-in stress before tight-tolerance finishing and expect springback-free chips.
Can POM ESD be welded?
With care — weldability is rated fair (35/100). Hot-plate, ultrasonic, spin and vibration welding all work well; no solvent bonding — adhesive joints require plasma, flame or chromic-acid surface activation.
What surface finishes work on POM ESD?
Paints and inks need surface pretreatment or special primers; parts polish to a waxy sheen, can be laser-marked, and plating requires a dedicated acetal etch process.
Can POM ESD be formed, bent or molded?
Dry only if resin is wet (≤0.1%), melt 190–215 °C, mold 80–100 °C, generous gates and full packing; watch ~2% shrinkage, sink and voids in thick sections and never overheat/stagnate melt (formaldehyde release).
What is the maximum service temperature of POM ESD?
POM ESD is rated for continuous use to about 90°C (194 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in POM ESD?
Yes — POM ESD is available for injection molding with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Hostaform / Celcon POM copolymer product and processing brochures — Celanese (2023)
- Delrin acetal homopolymer design and molding guides — DuPont / Delrin USA (2022)
- CAMPUS plastics ISO datasets for POM-C and POM-H injection grades — CWFG / CAMPUS consortium (2024)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ISO 9988 Plastics — Polyoxymethylene (POM) moulding and extrusion materials — ISO (2020)
- ASTM D6100 Standard Classification for Polyoxymethylene (POM) Molding and Extrusion Materials — ASTM (2020)
- Ensinger TECAFORM AH / AD stock shape datasheets — Ensinger (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.