GF Nylon-Like FR
Flame-retardant grade
FR = flame-retardant glass-filled grade
Use for electrical enclosures and rail/aero cabin mock-ups that must pass a V-0 or equivalent burn test.
Values for the FR condition
Other GF Nylon-Like grades and fills
GF Nylon-Like is listed in 7 conditions; see the grade overview at GF Nylon-Like.
Compare all 7 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
natural nylon-like PU resin (no glass) | Pick when toughness, snap-fits and living hinges matter more than stiffness or HDT. | — | 50 | 25 | 78 Shore D |
FRThis page Flame-retardant glass-filled grade | Use for electrical enclosures and rail/aero cabin mock-ups that must pass a V-0 or equivalent burn test. | — | 52 | 3.5 | 84 Shore D |
~15 % glass reinforced | Middle ground: noticeably stiffer than unfilled while keeping some ductility and easier degassing/casting. | — | 55 | 9 | 82 Shore D |
UV-stabilised / pigmented (typically black) grade | Specify when parts see daylight or must match a moulded black cosmetic finish; hides the yellowing of aromatic PU. | — | 58 | 5 | 85 Shore D |
GF-STDDefault Standard glass-reinforced nylon-like PU | Default choice for stiff, dimensionally stable vacuum-cast or cast-resin parts standing in for PA-GF injection mouldings. | — | 60 | 5 | 85 Shore D |
Heat-resistant / high-Tg glass-filled system | Choose for under-bonnet or paint-bake style exposure where 120 °C+ short excursions are expected; needs a longer high-temperature post-cure. | — | 65 | 2.5 | 87 Shore D |
~30–40 % glass reinforced | Highest stiffness and lowest CTE of the family — for jigs, housings and pressure-loaded brackets where brittleness is acceptable. | — | 68 | 2.5 | 88 Shore D |
What is GF Nylon-Like FR?
GF Nylon-Like FR is GF Nylon-Like in the FR grade — use for electrical enclosures and rail/aero cabin mock-ups that must pass a V-0 or equivalent burn test. GF Nylon-Like FR has a tensile strength of 52 MPa (7.54 ksi), stronger than 57% of polyurethane grades. Elongation at break is 3.5% and the elastic modulus is 4 GPa (0.58 Msi). GF Nylon-Like FR has a density of 1.5 g/cm³ (0.0542 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 95°C (203 °F). GF-STD is the default condition FabDigit quotes; FR is available on request or by drawing note.
Advantages
- Conducts heat well — 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 100% of polyurethane grades
- Stiff — 4 GPa (0.58 Msi), better than 95% of polyurethane grades
- High service temperature — 95°C (203 °F), better than 86% of polyurethane grades
- Low moisture uptake — 0.3%, better than 81% of polyurethane grades
Limitations
- Needs corrosion protection — 58/100, worse than 100% of polyurethane grades
- Limited ductility — 3.5%, worse than 95% of polyurethane grades
- Heavy — 1.5 g/cm³ (0.0542 lb/in³), worse than 95% of polyurethane grades
GF Nylon-Like FR properties
Typical room-temperature values for GF Nylon-Like FR; 26 are specific to this condition. Other listed values are GF Nylon-Like reference data and may not represent this condition. Bars are the position among polyurethane grades.
Physical4
GF Nylon-Like FR has a density of 1.5 g/cm³ (0.0542 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 95°C (203 °F).
Mechanical10
GF Nylon-Like FR has a tensile strength of 52 MPa (7.54 ksi), stronger than 57% of polyurethane grades. Elongation at break is 3.5% and the elastic modulus is 4 GPa (0.58 Msi).
Thermal10
GF Nylon-Like FR is rated for continuous service to 95°C (203 °F). It conducts heat at 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 100% of polyurethane grades. Thermal expansion is 55 µm/m·K (30.6 µin/in·°F).
Electrical5
GF Nylon-Like FR is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 3×10¹¹ Ω·m.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 100% of polyurethane grades. UV resistance is poor.
Sustainability4
Producing a kilogram of GF Nylon-Like FR takes about 105 MJ of energy and emits 5.5 kg of CO₂ — more than 64% of polyurethane grades. Typical recycled content is 0%.
Manufacturability4
GF Nylon-Like FR's machinability is fair (48/100, worse than 71% of polyurethane grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GF Nylon-Like FR
Is GF Nylon-Like easy to machine?
Machines cleanly with sharp carbide or PCD tools at high speed/low feed, but the glass is abrasive and the dust is respirable — use vacuum extraction and expect fast edge wear.
Can GF Nylon-Like be welded?
Thermoset — cannot be melt-welded; join with 2-K PU/epoxy adhesive, solvent-free structural acrylic, or moulded-in threaded inserts.
Can GF Nylon-Like be formed, bent or molded?
Degas and pour under vacuum into silicone tooling at 40–70 °C; keep filler in suspension by stirring, demould in 20–60 min and post-cure 2–8 h at 70–100 °C for full Tg and dimensional stability.
What surface finishes work on GF Nylon-Like?
Sands and primes readily; takes 2-K PU paint, soft-touch coating and pad printing well, and can be vacuum-metallised after a base coat — glass at the surface limits high-gloss polishing.
GF Nylon-Like 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 |
|---|---|---|
| polyol (polyester/polyether component B)resin side of the 2-K system | 35 – 55 | 45 |
| glass fiber / milled glassmilled fiber or glass microspheres, silane sized | 10 – 40 | 25 |
| mineral filler / pigment / catalyst / adtin or amine catalyst, defoamer, colourant | 0 – 8 | 3 |
| isocyanate (MDI/pMDI prepolymer componenaromatic in standard grades; aliphatic in UV-stable grades | ≥ 25 (balance) | — |
GF Nylon-Like FR — frequently asked
What is GF Nylon-Like FR used for?
GF Nylon-Like FR is typically used for structural brackets, functional structural prototypes, jigs and inspection fixtures, small-batch replacements for PA6/PA66-GF mouldings, housings and covers for rapid tooling and fan and gearbox covers. In short: stiffest cast PU; glass-filled-nylon-like rigidity.
What is the tensile strength of GF Nylon-Like FR?
GF Nylon-Like FR has a typical tensile strength of 52 MPa (7.54 ksi) — stronger than 57% of polyurethane grades. Strength varies by condition: see the 7 listed tempers.
Is GF Nylon-Like FR easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 71% of polyurethane grades). Machines cleanly with sharp carbide or PCD tools at high speed/low feed, but the glass is abrasive and the dust is respirable — use vacuum extraction and expect fast edge wear.
Can GF Nylon-Like FR be welded?
Thermoset — cannot be melt-welded; join with 2-K PU/epoxy adhesive, solvent-free structural acrylic, or moulded-in threaded inserts.
What surface finishes work on GF Nylon-Like FR?
Sands and primes readily; takes 2-K PU paint, soft-touch coating and pad printing well, and can be vacuum-metallised after a base coat — glass at the surface limits high-gloss polishing.
Can GF Nylon-Like FR be formed, bent or molded?
Degas and pour under vacuum into silicone tooling at 40–70 °C; keep filler in suspension by stirring, demould in 20–60 min and post-cure 2–8 h at 70–100 °C for full Tg and dimensional stability.
What is the maximum service temperature of GF Nylon-Like FR?
GF Nylon-Like FR is rated for continuous use to about 95°C (203 °F), and briefly to 130°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in GF Nylon-Like FR?
Yes — GF Nylon-Like FR is available for urethane casting with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Vacuum-casting polyurethane resin datasheets (nylon-like / glass-filled series) — Axson Technologies (Sika) (2021)
- Hei-Cast / Nihon Gosei PU casting resin technical data — H&K / Hei-Cast (2020)
- Handbook of Polyurethanes — CRC Press (2017)
- ISO 527 / ISO 178 / ISO 75 test methods for plastics — ISO (2019)
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.