CA vs CAP
Polymer · grade comparison
CA and CAP are both polymer grades. CA is the stronger of the two: yield strength 35 MPa (5.08 ksi) against 30 MPa (4.35 ksi) for CAP, about 17% more; tensile strength follows at 40 MPa (5.8 ksi) vs 32 MPa (4.64 ksi). In exchange, CAP is the more ductile: elongation 50% versus 30% for CA. CAP is lighter (1.21 g/cm³ vs 1.3 g/cm³ for CA) and CA is stiffer (1.6 GPa vs 1.4 GPa).
CAChoose it when strength drives the design.
CAPChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
CA vs CAP: 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
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Rockwell R
Same in both: Hardness, Shore D 78 Shore D
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Light Transmission
Melting Temperature (Tm)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Heat Deflection Temp. @ 0.45 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,600 J/kg·K0.38 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 130 µm/m·K72.2 µin/in·°F · Min Service Temperature -40°C-40 °F · Heat Deflection Temp. @ 1.8 MPa 55°C131 °F · Max Service Temperature (short-term) 90°C194 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Volume Resistivity
Same in both: Surface Resistivity 1×10¹³ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
UV / Weathering Resistance
Same in both: Corrosion Resistance 55 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Processing Melt Temperature (typ.)
Melt Flow Rate
Same in both: Mold Temperature (typ.) 55°C131 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Energy (primary production) 100 MJ/kg42,992 BTU/lb · Embodied Water 350 L/kg41.9 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Modulus of Resilience
Same in both: Specific Stiffness (E / density) 1.2 MN·m/kg · Thermal Diffusivity 0.1 mm²/s · Thermal Shock Resistance Index 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.
Manufacturing and finishing
| Capability | CA | CAP |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
CA vs CAP — frequently asked
Is CA stronger than CAP?
Yes. CA has a typical yield strength of 35 MPa (5.08 ksi) against 30 MPa (4.35 ksi) for CAP — about 17% more. Tensile strength is 40 MPa (5.8 ksi) vs 32 MPa (4.64 ksi).
Which is cheaper, CA or CAP?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, CA or CAP?
CAP. Its weldability rates good (60/100) against good (55/100) for CA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CA and CAP 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.