POM-H HI LUB vs POM-H HI ST
Polymer · POM-H HI grade comparison
POM-H HI LUB and POM-H HI ST are two grades of the same polymer grade, POM-H HI: LUB (internally lubricated toughened grade) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. POM-H HI ST is the stronger of the two: yield strength 45 MPa (6.53 ksi) against 40 MPa (5.8 ksi) for POM-H HI LUB, about 13% more; tensile strength follows at 45 MPa (6.53 ksi) vs 40 MPa (5.8 ksi). POM-H HI ST is the more ductile: elongation 220% versus 120% for POM-H HI LUB. POM-H HI ST is lighter (1.34 g/cm³ vs 1.4 g/cm³ for POM-H HI LUB) and POM-H HI LUB is stiffer (1.5 GPa vs 1.4 GPa). On the shop floor, POM-H HI LUB machines more easily (82 vs 72 out of 100) and POM-H HI ST welds better (fair vs poor).
POM-H HI LUBChoose it when the part is machined in volume.
POM-H HI STChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
POM-H HI LUB vs POM-H HI ST: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Shear Modulus 0.5 GPa0.07 Msi · Poisson's Ratio 0.4 · Compressive Modulus 1.4 GPa0.2 Msi
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 178°C352 °F · Glass Transition (Tg) -60°C-76 °F · Water Absorption (24 h) 0.25% · Water Absorption (Saturation) 0.9%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,500 J/kg·K0.36 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 125 µm/m·K69.4 µin/in·°F · Max Service Temperature (continuous) 85°C185 °F · Min Service Temperature -50°C-58 °F · Max Service Temperature (short-term) 130°C266 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹² Ω·m3.94×10¹⁹ µΩ·in · Dielectric Strength 18 kV/mm457 V/mil · Dielectric Constant (1 MHz) 3.7 · Dissipation Factor (1 MHz) 0.005 · Volume Resistivity 1×10¹⁴ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 68 / 100 · UV / Weathering Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Melt Flow Rate
Same in both: Polishability 55 / 100 · Mold Shrinkage 2% · Processing Melt Temperature (typ.) 215°C419 °F · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 92 MJ/kg39,553 BTU/lb · Embodied Carbon (primary production) 4.4 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 0%
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
POM-H HI LUB vs POM-H HI ST — frequently asked
Is POM-H HI ST stronger than POM-H HI LUB?
Yes. POM-H HI ST has a typical yield strength of 45 MPa (6.53 ksi) against 40 MPa (5.8 ksi) for POM-H HI LUB — about 13% more. Tensile strength is 45 MPa (6.53 ksi) vs 40 MPa (5.8 ksi).
Which grade does FabDigit quote by default, LUB or ST?
ST is the default POM-H HI condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, POM-H HI LUB or POM-H HI ST?
POM-H HI LUB, by a small margin. Both rate very good for machinability — 82/100 against 72/100 for POM-H HI ST; for welding the order is POM-H HI ST first (fair, 45/100) then POM-H HI LUB (poor, 22/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in POM-H HI LUB and POM-H HI ST side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.