CA vs CTA
Polymer · grade comparison
CA and CTA are both polymer grades. CTA is the stronger of the two: yield strength 55 MPa (7.98 ksi) against 35 MPa (5.08 ksi) for CA, about 57% more; tensile strength follows at 70 MPa (10.2 ksi) vs 40 MPa (5.8 ksi). In exchange, CA is the more ductile: elongation 30% versus 25% for CTA. CTA is stiffer (3.2 GPa vs 1.6 GPa) and CTA runs hotter in service (95°C vs 65°C continuous). On the shop floor, CA machines more easily (very good vs good).
CAChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
CTAChoose it when strength drives the design, or when the part sees heat.
CA vs CTA: 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, Shore D
Hardness, Rockwell R
Hardness, Rockwell M
Physical
Density and transition temperatures.
Glass Transition (Tg)
Water Absorption (Saturation)
Refractive Index
Light Transmission
Melting Temperature (Tm)
Same in both: Density 1.3 g/cm³0.05 lb/in³ · Water Absorption (24 h) 2.5%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Same in both: Min Service Temperature -40°C-40 °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).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Same in both: Mold Shrinkage 0.5%
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 2%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: 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 | CTA |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
CA vs CTA — frequently asked
Is CTA stronger than CA?
Yes. CTA has a typical yield strength of 55 MPa (7.98 ksi) against 35 MPa (5.08 ksi) for CA — about 57% more. Tensile strength is 70 MPa (10.2 ksi) vs 40 MPa (5.8 ksi).
Which is cheaper, CA or CTA?
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 is easier to machine, CA or CTA?
CA. Its machinability rates very good (75/100) against good (65/100) for CTA; for welding the order is CTA first (good, 60/100) then CA (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in CA and CTA 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.