HNBR vs XNBR
Polymer · grade comparison
HNBR and XNBR are both polymer grades. XNBR is the more ductile: elongation 450% versus 300% for HNBR, and HNBR is harder (22 Shore D vs 20 Shore D). HNBR runs hotter in service (150°C vs 100°C continuous). On the shop floor, XNBR sits in a lower cost tier (premium, $$$) than HNBR (high, $$$$).
HNBRChoose it when the part sees heat.
XNBRChoose it when the part is bent, formed or impact-loaded, or when cost is the deciding factor.
HNBR vs XNBR: 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.
Poisson's Ratio
Elongation at Break
Shear Strength
Hardness, Shore D
Tear Strength
Compression Set (22 h, 70 °C)
Same in both: Elastic (Young's) Modulus 0.01 GPa0 Msi · Tensile Strength (Ultimate) 25 MPa3.6 ksi · Hardness, Shore A 70 Shore A
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Max Service Temperature (continuous)
Min Service Temperature
Max Service Temperature (short-term)
Same in both: Thermal Conductivity 0.25 W/m·K0.14 BTU/hr·ft·°F · Thermal Expansion (CTE, 20–100 °C) 220 µm/m·K122 µin/in·°F · Limiting Oxygen Index 20%
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Same in both: Electrical Resistivity 1×10⁸ Ω·m3.94×10¹⁵ µΩ·in · Dielectric Strength 16 kV/mm406 V/mil · Volume Resistivity 1×10¹⁰ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Weldability
Same in both: Formability (cold) 90 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Embodied Water
Common Calculations
Ratios derived from the values above.
Same in both: Specific Strength (UTS / density) 20 kN·m/kg · Specific Stiffness (E / density) 0 MN·m/kg · Thermal Diffusivity 0.1 mm²/s · Thermal Shock Resistance Index 4
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.
Manufacturing and finishing
| Capability | HNBR | XNBR |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
HNBR vs XNBR — frequently asked
What is the difference between HNBR and XNBR?
HNBR and XNBR are both polymer grades. XNBR is the more ductile: elongation 450% versus 300% for HNBR, and HNBR is harder (22 Shore D vs 20 Shore D). HNBR runs hotter in service (150°C vs 100°C continuous).
Which is cheaper, HNBR or XNBR?
XNBR is the lower-cost material: it sits in the premium tier ($$$) while HNBR is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, HNBR or XNBR?
XNBR. Its machinability rates fair (35/100) against poor (30/100) for HNBR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in HNBR and XNBR 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.