PA66 HS (Heat stabilized)
Additive grade
also Stanyl, Ultramid A
Copper/organic or high-performance stabilizer package for long-term air ageing at 120–150 °C (under-hood, lighting).
Values for the HS condition
Other PA66 grades and fills
PA66 is listed in 12 conditions; see the grade overview at PA66.
Compare all 12 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact modified / super tough | Rubber-toughened PA66 for parts needing high notched and cold impact (housings, snap-fits, sporting goods). | 50 | 52 | 60 | 110 HRR |
PTFE lubricated | 15–20 % PTFE (sometimes with silicone oil) for dry-running bushings, slides and gears with low friction and wear. | 62 | 62 | 15 | 79 Shore D |
ESD / conductive | Use where static dissipation (10^4–10^9 Ω surface) is required, e.g. fuel-system and electronics handling parts. | 70 | 70 | 6 | 82 Shore D |
Flame retardant, UL 94 V-0 | Choose for electrical connectors, switches and housings needing a V-0 Yellow Card; expect reduced toughness and higher density. | — | 75 | 8 | — |
MoS2 filled | MoS2 nucleated/lubricated grade with higher crystallinity, slightly better wear, stiffness and dimensional stability than natural. | 78 | 80 | 20 | 83 Shore D |
HSThis page Heat stabilized | Copper/organic or high-performance stabilizer package for long-term air ageing at 120–150 °C (under-hood, lighting). | 82 | 82 | 35 | 81 Shore D |
40 % mineral filled | Mineral (talc/wollastonite) filler for isotropic shrinkage, flat parts and good paintable surface at modest stiffness gain. | — | 90 | 4 | — |
15 % short glass fiber reinforced | Moderate stiffness/HDT boost with better surface finish and less warpage than GF30. | — | 130 | 5 | — |
30 % short glass fiber reinforced | The workhorse structural PA66: high stiffness, ~250 °C HDT and good creep resistance for under-hood and connector parts. | — | 180 | 3 | 95 HRM |
20 % carbon fiber reinforced | High specific stiffness with lower density than glass and antistatic behaviour; use where weight and precision matter. | — | 205 | 2.2 | — |
50 % short glass fiber reinforced | Maximum stiffness and strength for metal-replacement brackets and structural housings; very abrasive and anisotropic. | — | 230 | 2.3 | — |
30 % carbon fiber reinforced | Stiffest and most dimensionally stable PA66 compound, mildly conductive; chosen for lightweight precision and ESD-sensitive parts. | — | 240 | 1.8 | — |
What is PA66 HS?
PA66 HS is PA66 in the HS grade — copper/organic or high-performance stabilizer package for long-term air ageing at 120–150 °C (under-hood, lighting). PA66 HS has a yield strength of 82 MPa (11.9 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 89% of polymer grades. Elongation at break is 35% and the elastic modulus is 3 GPa (0.435 Msi). PA66 HS has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 70°C (158 °F).
Advantages
- High strength — 82 MPa (11.9 ksi), better than 89% of polymer grades
- High service temperature — 140°C (284 °F), better than 76% of polymer grades
Limitations
- Needs corrosion protection — 55/100, worse than 94% of polymer grades
- Absorbs moisture — dry before molding — 1.3%, worse than 88% of polymer grades
- High embodied carbon — 6.7 kg CO₂/kg, worse than 75% of polymer grades
PA66 HS properties
Typical room-temperature values for PA66 HS; 27 are specific to this condition. Other listed values are PA66 reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
PA66 HS has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 70°C (158 °F).
Mechanical17
PA66 HS has a yield strength of 82 MPa (11.9 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 89% of polymer grades. Elongation at break is 35% and the elastic modulus is 3 GPa (0.435 Msi).
Thermal11
PA66 HS is rated for continuous service to 140°C (284 °F). It conducts heat at 0.25 W/m·K (0.144 BTU/hr·ft·°F), better than 72% of polymer grades. Thermal expansion is 85 µm/m·K (47.2 µin/in·°F).
Electrical7
PA66 HS is an electrical insulator with a dielectric strength of 22 kV/mm (558.8 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 94% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PA66 HS takes about 120 MJ of energy and emits 6.7 kg of CO₂ — more than 73% of polymer grades. Typical recycled content is 5%.
Manufacturability8
PA66 HS's machinability is good (65/100, better than 66% of polymer grades); weldability good (60/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PA66 HS
Is PA66 easy to machine?
Machines easily with sharp, positive-rake tools, high speed and low feed; use air or flood coolant to avoid heat build-up and expect stress relief/moisture growth on tight tolerances — glass/carbon filled grades need carbide or PCD.
Can PA66 be welded?
Ultrasonic, hot-plate, spin, vibration and laser welding all work well on dry material; moisture causes porous joints, and glass content above ~30 % lowers weld factor.
Can PA66 be formed, bent or molded?
Dry to <0.15 % moisture, melt 275–300 °C, mold 60–100 °C, fast injection with generous venting; account for 1.0–2.2 % shrink (0.2–0.6 % when glass filled) and anisotropic warpage in fiber-filled parts.
What surface finishes work on PA66?
Takes acid dyeing, adhesive bonding (after plasma/primer), painting and vacuum metallizing; direct electroless plating is possible on etched grades, and moisture conditioning is often used to reach in-service dimensions.
PA66 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| heat/light stabilizers, lubricants, nuclAdditive package varies by grade (Cu/halide, HALS, carbon black, mold release) | 0 – 3 | 0.5 |
| glass fiberOnly in GF15/GF30/GF50 variants (silane-sized E-glass) | 0 – 50 | 0 |
| carbon fiberOnly in CF20/CF30 variants | 0 – 30 | 0 |
| flame retardant systemOnly in FR V-0 variant (brominated + Sb2O3 or halogen-free phosphinate) | 0 – 25 | 0 |
| poly(hexamethylene adipamide) — hexamethBase resin; nominal 1:1 diamine/diacid molar ratio | ≥ 97 (balance) | — |
PA66 HS — frequently asked
What is PA66 HS used for?
PA66 HS is typically used for automotive intake manifolds, cooling system housings and fans, electrical connectors, cable ties, gears and bearing bushings and fasteners and clips. In short: harder wear-resistant nylon.
What is the yield strength of PA66 HS?
PA66 HS has a typical yield strength of 82 MPa (11.9 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 89% of polymer grades. Strength varies by condition: see the 12 listed tempers.
Is PA66 HS easy to machine?
Reasonably — machinability is rated good (65/100, better than 66% of polymer grades). Machines easily with sharp, positive-rake tools, high speed and low feed; use air or flood coolant to avoid heat build-up and expect stress relief/moisture growth on tight tolerances — glass/carbon filled grades need carbide or PCD.
Can PA66 HS be welded?
Yes — weldability is rated good (60/100). Ultrasonic, hot-plate, spin, vibration and laser welding all work well on dry material; moisture causes porous joints, and glass content above ~30 % lowers weld factor.
What surface finishes work on PA66 HS?
Takes acid dyeing, adhesive bonding (after plasma/primer), painting and vacuum metallizing; direct electroless plating is possible on etched grades, and moisture conditioning is often used to reach in-service dimensions.
Can PA66 HS be formed, bent or molded?
Dry to <0.15 % moisture, melt 275–300 °C, mold 60–100 °C, fast injection with generous venting; account for 1.0–2.2 % shrink (0.2–0.6 % when glass filled) and anisotropic warpage in fiber-filled parts.
What is the maximum service temperature of PA66 HS?
PA66 HS is rated for continuous use to about 140°C (284 °F), and briefly to 180°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PA66 HS?
Yes — PA66 HS is available for CNC machining, sheet metal and injection molding with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ISO 16396-1/-2 Plastics — Polyamide (PA) moulding and extrusion materials — ISO (2022)
- ASTM D4066 Standard Classification System for Nylon Injection and Extrusion Materials — ASTM (2019)
- Zytel PA66 product datasheets (101, 70G33, ST801) — DuPont / Celanese (2023)
- Ultramid A (PA66) product range brochure — BASF (2022)
- Ertalon 66 SA stock shape datasheet — Mitsubishi Chemical Advanced Materials (2021)
- Tecamid 66 / Tecamid 66 GF30 datasheets — Ensinger (2022)
- CAMPUS plastics database — PA66 grades — CWFG / CAMPUS consortium (2024)
- Engineering Plastics — Engineered Materials Handbook Vol. 2 — ASM International (1988)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.