PA66 vs PA6T
Polymer · grade comparison
PA66 and PA6T are both polymer grades. PA6T is the stronger of the two: yield strength 95 MPa (13.8 ksi) against 80 MPa (11.6 ksi) for PA66, about 19% more; tensile strength follows at 100 MPa (14.5 ksi) vs 82 MPa (11.9 ksi). In exchange, PA66 is the more ductile: elongation 40% versus 20% for PA6T, and PA6T is harder (86 Shore D vs 81 Shore D). PA66 is lighter (1.14 g/cm³ vs 1.19 g/cm³ for PA6T) and PA6T is stiffer (3.2 GPa vs 3 GPa). On the shop floor, PA66 welds better (very good vs good) and PA66 sits in a lower cost tier (standard, $$) than PA6T (premium, $$$).
PA66Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PA6TChoose it when strength drives the design, or when the part sees heat.
PA66 vs PA6T: 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)
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Izod Impact, Notched 50 J/m0.94 ft·lbf/in
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Thermal
How each material carries heat and how hot it can run.
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: Thermal Conductivity 0.25 W/m·K0.14 BTU/hr·ft·°F · 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
Surface Resistivity
Same in both: Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Melt Flow Rate
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 | PA66 | PA6T |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Injection molding | Yes | — |
| Default condition | Unfilled | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.5 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Chrome Plating (Plastic) | Yes | — |
| EMI Shielding Coating | Yes | — |
| Painting | Yes | — |
| Soft Touch Coating | Yes | — |
| Spray Painting | Yes | — |
| UV Coating | Yes | — |
PA66 vs PA6T — frequently asked
Is PA6T stronger than PA66?
Yes. PA6T has a typical yield strength of 95 MPa (13.8 ksi) against 80 MPa (11.6 ksi) for PA66 — about 19% more. Tensile strength is 100 MPa (14.5 ksi) vs 82 MPa (11.9 ksi).
Which is cheaper, PA66 or PA6T?
PA66 is the lower-cost material: it sits in the standard tier ($$) while PA6T is premium ($$$). 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, PA66 or PA6T?
PA66, by a small margin. Both rate good for machinability — 65/100 against 60/100 for PA6T; for welding the order is PA66 first (very good, 70/100) then PA6T (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PA66 and PA6T 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.