PA6G HS (Heat-stabilized cast PA6)
Additive grade
also Nylatron
Use for long-term hot-air service (ovens, engine bays) where thermo-oxidative embrittlement of the natural grade would occur.
Values for the HS condition
Other PA6G grades and fills
PA6G is listed in 4 conditions; see the grade overview at PA6G.
Compare all 4 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
internally lubricated cast PA6 (oil-impregnated bearing grade) | Pick for dry-running or poorly lubricated plain bearings and slides: lowest friction and highest sliding speed/wear life of the cast nylon family. | — | 68 | 20 | 78 Shore D |
HSThis page Heat-stabilized cast PA6 | Use for long-term hot-air service (ovens, engine bays) where thermo-oxidative embrittlement of the natural grade would occur. | 76 | 80 | 20 | 82 Shore D |
Molybdenum disulphide filled cast PA6 | Choose when higher stiffness, better dimensional stability and improved dry wear are needed at moderate cost — standard for gears, sprockets and heavily loaded bushings. | — | 80 | 15 | 85 Shore D |
Cast UnfilledDefault natural/ivory cast PA6 (MC nylon) | Default choice for gears, bushings, wear strips and general machined parts where maximum toughness and best electrical/food-neutral behaviour are wanted. | — | 82 | 25 | 82 Shore D |
What is PA6G HS?
PA6G HS is PA6G in the HS grade — use for long-term hot-air service (ovens, engine bays) where thermo-oxidative embrittlement of the natural grade would occur. PA6G HS has a yield strength of 76 MPa (11 ksi) and a tensile strength of 80 MPa (11.6 ksi) — stronger than 85% of polymer grades. Elongation at break is 20% and the elastic modulus is 3.4 GPa (0.493 Msi). PA6G HS has a density of 1.15 g/cm³ (0.0415 lb/in³), lighter than 57% of polymer grades. Its glass-transition temperature is 60°C (140 °F). Cast Unfilled is the default condition FabDigit quotes; HS is available on request or by drawing note.
Advantages
- High strength — 76 MPa (11 ksi), better than 85% of polymer grades
- Easy to machine — 80/100, better than 84% of polymer grades
- Stiff — 3.4 GPa (0.493 Msi), better than 82% of polymer grades
- Conducts heat well — 0.29 W/m·K (0.168 BTU/hr·ft·°F), better than 80% of polymer grades
- Good UV / weathering resistance — 55/100, better than 77% of polymer grades
Limitations
- Absorbs moisture — dry before molding — 1.3%, worse than 88% of polymer grades
- Needs corrosion protection — 62/100, worse than 87% of polymer grades
- High embodied carbon — 6.8 kg CO₂/kg, worse than 75% of polymer grades
PA6G HS properties
Typical room-temperature values for PA6G HS; 27 are specific to this condition. Other listed values are PA6G reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
PA6G HS has a density of 1.15 g/cm³ (0.0415 lb/in³), lighter than 57% of polymer grades. Its glass-transition temperature is 60°C (140 °F).
Mechanical15
PA6G HS has a yield strength of 76 MPa (11 ksi) and a tensile strength of 80 MPa (11.6 ksi) — stronger than 85% of polymer grades. Elongation at break is 20% and the elastic modulus is 3.4 GPa (0.493 Msi).
Thermal11
PA6G HS is rated for continuous service to 120°C (248 °F). It conducts heat at 0.29 W/m·K (0.168 BTU/hr·ft·°F), better than 80% of polymer grades. Thermal expansion is 85 µm/m·K (47.2 µin/in·°F).
Electrical7
PA6G HS is an electrical insulator with a dielectric strength of 28 kV/mm (711.2 V/mil) and a resistivity of 1×10¹¹ Ω·m.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 87% of polymer grades. UV resistance is good.
Sustainability4
Producing a kilogram of PA6G HS takes about 125 MJ of energy and emits 6.8 kg of CO₂ — more than 75% of polymer grades. Typical recycled content is 0%.
Manufacturability6
PA6G HS's machinability is very good (80/100, better than 84% of polymer grades); weldability fair (35/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PA6G HS
Is PA6G easy to machine?
Excellent — sharp positive-rake tools, high speed with moderate feed, good chip clearance and air/mist cooling; anneal thick or unbalanced parts in oil at 150–170 °C to relieve stress before finish cuts.
Can PA6G be welded?
Not fusion weldable in cast stock practice; hot-plate or hot-gas welding of thin sections is possible but joints are weak — prefer mechanical fastening or adhesive bonding after flame/plasma pretreatment.
Can PA6G be formed, bent or molded?
Made by anionic in-mould casting of caprolactam at ~150–180 °C with negligible pressure, so very large rods, tubes and near-net shapes are practical; not an injection-moulding grade.
What surface finishes work on PA6G?
Turned/milled surfaces take a fine matte finish; can be dyed, printed or lightly polished, but no plating or anodizing — allow 0.3–0.5 % dimensional growth from moisture pick-up before setting final tolerances.
PA6G 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 |
|---|---|---|
| MoS2MoS2 Filled variant only | 1 – 3 | 2 |
| lubricating oilOil Filled variant only | 5 – 12 | 8 |
| heat stabilizer / pigmentHS and coloured grades | 0.1 – 1 | 0.5 |
| polycaprolactam (PA6, from ε-caprolactamanionically polymerized in mould with alkaline catalyst/activator (<1 %) | balance | — |
PA6G HS — frequently asked
What is PA6G HS used for?
PA6G HS is typically used for large gears, pulleys and wear pads. In short: cast nylon machining plate.
What is the yield strength of PA6G HS?
PA6G HS has a typical yield strength of 76 MPa (11 ksi) and a tensile strength of 80 MPa (11.6 ksi) — stronger than 85% of polymer grades. Strength varies by condition: see the 4 listed tempers.
Is PA6G HS easy to machine?
Yes — machinability is rated very good (80/100, better than 84% of polymer grades). Excellent — sharp positive-rake tools, high speed with moderate feed, good chip clearance and air/mist cooling; anneal thick or unbalanced parts in oil at 150–170 °C to relieve stress before finish cuts.
Can PA6G HS be welded?
With care — weldability is rated fair (35/100). Not fusion weldable in cast stock practice; hot-plate or hot-gas welding of thin sections is possible but joints are weak — prefer mechanical fastening or adhesive bonding after flame/plasma pretreatment.
What surface finishes work on PA6G HS?
Turned/milled surfaces take a fine matte finish; can be dyed, printed or lightly polished, but no plating or anodizing — allow 0.3–0.5 % dimensional growth from moisture pick-up before setting final tolerances.
Can PA6G HS be formed, bent or molded?
Made by anionic in-mould casting of caprolactam at ~150–180 °C with negligible pressure, so very large rods, tubes and near-net shapes are practical; not an injection-moulding grade.
What is the maximum service temperature of PA6G HS?
PA6G HS is rated for continuous use to about 120°C (248 °F), and briefly to 170°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PA6G Cast Unfilled and PA6G HS?
Cast Unfilled is the default condition — default choice for gears, bushings, wear strips and general machined parts where maximum toughness and best electrical/food-neutral behaviour are wanted. HS: use for long-term hot-air service (ovens, engine bays) where thermo-oxidative embrittlement of the natural grade would occur. Yield strength is 76 MPa in Cast Unfilled versus 76 MPa in HS.
Can FabDigit make parts in PA6G HS?
Yes — PA6G HS is available for CNC machining, sheet metal and injection molding; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- TECAST / TECAMID cast nylon product data — Ensinger (2023)
- Nylatron GS / NSM and Nylon 6 cast shapes data sheets — Mitsubishi Chemical Advanced Materials (Quadrant) (2022)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ASTM D6779 Standard Classification System for Polyamide Molding and Extrusion Materials — ASTM (2020)
- CAMPUS polyamide 6 datasheets — CWFG (2024)
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.