BR vs SBR
Polymer · grade comparison
BR and SBR are both polymer grades. BR is the more ductile: elongation 450% versus 400% for SBR. BR is lighter (0.93 g/cm³ vs 1.15 g/cm³ for SBR) and SBR is stiffer (0.01 GPa vs 0 GPa).
BRChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
SBRChoose it when the part sees heat.
BR vs SBR: 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
Shear Modulus
Poisson's Ratio
Elongation at Break
Compression Set (22 h, 70 °C)
Same in both: Bulk Modulus 2 GPa0.29 Msi · Tensile Strength (Ultimate) 15 MPa2.2 ksi · Hardness, Shore A 60 Shore A · Hardness, Shore D 12 Shore D · Tear Strength 25 kN/m143 lbf/in
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Refractive Index
Water Absorption (Saturation)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Max Service Temperature (continuous)
Min Service Temperature
Limiting Oxygen Index
Same in both: Thermal Expansion (CTE, 20–100 °C) 220 µm/m·K122 µin/in·°F · Max Service Temperature (short-term) 120°C248 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Volume Resistivity
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.
Weldability
Formability (cold)
Processing Melt Temperature (typ.)
Same in both: Machinability 25 / 100 · Mold Shrinkage 2% · Mold Temperature (typ.) 160°C320 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Carbon (primary production) 3.2 kg CO₂/kg
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 0 MN·m/kg · Thermal Diffusivity 0.1 mm²/s
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 | BR | SBR |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
BR vs SBR — frequently asked
What is the difference between BR and SBR?
BR and SBR are both polymer grades. BR is the more ductile: elongation 450% versus 400% for SBR. BR is lighter (0.93 g/cm³ vs 1.15 g/cm³ for SBR) and SBR is stiffer (0.01 GPa vs 0 GPa).
Which is cheaper, BR or SBR?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, BR or SBR?
BR. Its weldability rates poor (20/100) against not recommended (12/100) for SBR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in BR and SBR 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.