POM MoS2
Additive grade
ASTM D4181 · also Delrin
MoS2 = molybdenum disulfide filled
Dark, wear-resistant bearing grade for moderate loads where PTFE cost or FDA compliance is not required.
Values for the MoS2 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 |
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 | |
MoS2This page 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 MoS2?
POM MoS2 is POM in the MoS2 grade — dark, wear-resistant bearing grade for moderate loads where PTFE cost or FDA compliance is not required. POM MoS2 has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 60 MPa (8.7 ksi) — stronger than 66% of polymer grades. Elongation at break is 15% and the elastic modulus is 3 GPa (0.435 Msi). POM MoS2 has a density of 1.43 g/cm³ (0.0517 lb/in³), heavier than 84% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Advantages
- Easy to machine — 90/100, better than 95% of polymer grades
- Conducts heat well — 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 89% of polymer grades
- Tough — resists crack growth — 3.5 MPa·√m (3.19 ksi·√in), better than 81% of polymer grades
- Polishes to a fine finish — 70/100, better than 77% of polymer grades
Limitations
- Heavy — 1.43 g/cm³ (0.0517 lb/in³), worse than 84% of polymer grades
- High mold shrinkage — 2%, worse than 81% of polymer grades
- Needs corrosion protection — 70/100, worse than 78% of polymer grades
POM MoS2 properties
Typical room-temperature values for POM MoS2; 27 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 MoS2 has a density of 1.43 g/cm³ (0.0517 lb/in³), heavier than 84% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Mechanical17
POM MoS2 has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 60 MPa (8.7 ksi) — stronger than 66% of polymer grades. Elongation at break is 15% and the elastic modulus is 3 GPa (0.435 Msi).
Thermal11
POM MoS2 is rated for continuous service to 100°C (212 °F). It conducts heat at 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 89% of polymer grades. Thermal expansion is 110 µm/m·K (61.1 µin/in·°F).
Electrical7
POM MoS2 is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 78% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of POM MoS2 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 MoS2's machinability is excellent (90/100, better than 95% of polymer grades); weldability fair (40/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with POM MoS2
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 MoS2 — frequently asked
What is POM MoS2 used for?
POM MoS2 is typically used for gears, clips and fuel systems. In short: stiff dimensional acetal.
What is the yield strength of POM MoS2?
POM MoS2 has a typical yield strength of 58 MPa (8.41 ksi) and a tensile strength of 60 MPa (8.7 ksi) — stronger than 66% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is POM MoS2 easy to machine?
Yes — machinability is rated excellent (90/100, better than 95% 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 MoS2 be welded?
With care — weldability is rated fair (40/100). 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 MoS2?
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 MoS2 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 MoS2?
POM MoS2 is rated for continuous use to about 100°C (212 °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 MoS2?
Yes — POM MoS2 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.