PA6G · grade · default condition
PA6G Cast Unfilled
Properties of the Cast Unfilled condition, compared with the other PA6G grades.
Default choice for gears, bushings, wear strips and general machined parts where maximum toughness and best electrical/food-neutral behaviour are wanted.
What is PA6G Cast Unfilled?
PA6G Cast Unfilled is PA6G in the Cast Unfilled grade — default choice for gears, bushings, wear strips and general machined parts where maximum toughness and best electrical/food-neutral behaviour are wanted. PA6G Cast Unfilled has a yield strength of 78 MPa (11.3 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 85% of polymer grades. Elongation at break is 25% and the elastic modulus is 3.4 GPa (0.493 Msi). PA6G Cast Unfilled 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).
Advantages
- High strength — 78 MPa (11.3 ksi), better than 85% of polymer grades
- Easy to machine — 80/100, better than 83% of polymer grades
- Stiff — 3.4 GPa (0.493 Msi), better than 81% of polymer grades
- Conducts heat well — 0.29 W/m·K (0.168 BTU/hr·ft·°F), better than 79% of polymer grades
Limitations
- Needs corrosion protection — 62/100, worse than 89% of polymer grades
- Absorbs moisture — dry before molding — 1.3%, worse than 89% of polymer grades
- High embodied carbon — 6.8 kg CO₂/kg, worse than 75% of polymer grades
PA6G Cast Unfilled properties
Typical room-temperature values for PA6G Cast Unfilled — 16 properties are specific to this condition; the rest are grade-level values shared by every PA6G grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical5
PA6G Cast Unfilled 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 Cast Unfilled has a yield strength of 78 MPa (11.3 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 85% of polymer grades. Elongation at break is 25% and the elastic modulus is 3.4 GPa (0.493 Msi).
Thermal11
PA6G Cast Unfilled is rated for continuous service to 105°C (221 °F). It conducts heat at 0.29 W/m·K (0.168 BTU/hr·ft·°F), better than 79% of polymer grades. Thermal expansion is 85 µm/m·K (47.2 µin/in·°F).
Electrical7
PA6G Cast Unfilled is an electrical insulator with a dielectric strength of 28 kV/mm (711.2 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 89% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PA6G Cast Unfilled 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 Cast Unfilled's machinability is very good (80/100, better than 83% of polymer grades); weldability poor (30/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PA6G grades and fills
PA6G is also supplied in 4 other conditions. The full side-by-side table is on the PA6G overview.
- Cast UnfilledDefaultDefault choice for gears, bushings, wear strips and general machined parts where maximum toughness and best electrical/food-neutral behaviour are wanted.82 MPa tensile
- MoS2 FilledChoose when higher stiffness, better dimensional stability and improved dry wear are needed at moderate cost — standard for gears, sprockets and heavily loaded bushings.80 MPa tensile
- Oil FilledPick for dry-running or poorly lubricated plain bearings and slides: lowest friction and highest sliding speed/wear life of the cast nylon family.68 MPa tensile
Working with PA6G Cast Unfilled
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 Cast Unfilled — frequently asked
What is PA6G Cast Unfilled used for?
PA6G Cast Unfilled is typically used for large gears, pulleys and wear pads. In short: cast nylon machining plate.
What is the yield strength of PA6G Cast Unfilled?
PA6G Cast Unfilled has a typical yield strength of 78 MPa (11.3 ksi) and a tensile strength of 82 MPa (11.9 ksi) — stronger than 85% of polymer grades. Strength varies by condition: see the 5 listed tempers.
Is PA6G Cast Unfilled easy to machine?
Yes — machinability is rated very good (80/100, better than 83% 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 Cast Unfilled be welded?
Not readily — weldability is rated poor (30/100). 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 Cast Unfilled?
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 Cast Unfilled 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 Cast Unfilled?
PA6G Cast Unfilled is rated for continuous use to about 105°C (221 °F), and briefly to 160°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PA6G Cast Unfilled?
Yes — PA6G Cast Unfilled 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
- 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.