PU-HighTemp MF
Reinforced grade
MF = mineral / glass-microsphere filled high-heat PU
Choose the mineral or glass-microsphere filled version for fixtures and brackets needing higher stiffness at 4.2 GPa, lower CTE and dimensional stability; elongation drops to 3%.
Values for the MF condition
Other PU-HighTemp grades and fills
PU-HighTemp is listed in 7 conditions; see the grade overview at PU-HighTemp.
Compare all 7 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
As-cast | Take parts delivered with room-temperature cure only for appearance models: dimensionally stable but heat resistance stops at 60 °C service and 75 °C Tg, far short of the rated level. | 45 | 55 | 12 | 80 Shore D |
Impact-modified high-heat PU | Choose the impact-modified version for snap fits and thin-wall housings needing drop toughness, with 25% elongation and PC/ABS-like behaviour, where slightly lower HDT is acceptable. | 45 | 55 | 25 | 80 Shore D |
Aluminium-powder filled high-heat PU | Use the aluminium-powder filled version for cast parts needing a metallic look, 0.6 W/m·K conductivity and 4.5 GPa stiffness, such as lamp reflectors and mould-insert prototypes. | — | 50 | 2 | — |
Flame-retardant high-heat PU | Specify the flame-retardant version for electrical enclosures and rail or cabin interior prototypes that must meet UL 94 V-0; service temperature is 100 °C at 55 MPa tensile. | 50 | 55 | 4 | 87 Shore D |
Transparent / optical high-heat PU | Pick the transparent aliphatic system for lenses, light guides and viewing windows; it resists yellowing but costs more and has somewhat lower heat resistance than the standard casting resin. | 52 | 60 | 10 | 82 Shore D |
MFThis page Mineral / glass-microsphere filled high-heat PU | Choose the mineral or glass-microsphere filled version for fixtures and brackets needing higher stiffness at 4.2 GPa, lower CTE and dimensional stability; elongation drops to 3%. | — | 58 | 3 | 88 Shore D |
Extended high-temperature post-cure | Pick the extended 100–120 °C ramped post-cure for the highest HDT and Tg (140 °C Tg, 130 °C service); the trade-offs are lower toughness at 5% elongation and more post-cure distortion. | 62 | 70 | 5 | 87 Shore D |
What is PU-HighTemp MF?
PU-HighTemp MF is PU-HighTemp in the MF grade — choose the mineral or glass-microsphere filled version for fixtures and brackets needing higher stiffness at 4.2 GPa, lower CTE and dimensional stability; elongation drops to 3%. PU-HighTemp MF has a tensile strength of 58 MPa (8.41 ksi), stronger than 71% of polyurethane grades. Elongation at break is 3% and the elastic modulus is 4.2 GPa (0.609 Msi). PU-HighTemp MF has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 120°C (248 °F).
Advantages
- Stiff — 4.2 GPa (0.609 Msi), better than 100% of polyurethane grades
- High service temperature — 110°C (230 °F), better than 95% of polyurethane grades
- Conducts heat well — 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 95% of polyurethane grades
- Low moisture uptake — 0.25%, better than 93% of polyurethane grades
- Low, predictable mold shrinkage — 0.15%, better than 92% of polyurethane grades
Limitations
- Limited ductility — 3%, worse than 95% of polyurethane grades
- Heavy — 1.45 g/cm³ (0.0524 lb/in³), worse than 95% of polyurethane grades
PU-HighTemp MF properties
Typical room-temperature values for PU-HighTemp MF; 14 are specific to this condition. Other listed values are PU-HighTemp reference data and may not represent this condition. Bars are the position among polyurethane grades.
Physical4
PU-HighTemp MF has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 120°C (248 °F).
Mechanical11
PU-HighTemp MF has a tensile strength of 58 MPa (8.41 ksi), stronger than 71% of polyurethane grades. Elongation at break is 3% and the elastic modulus is 4.2 GPa (0.609 Msi).
Thermal10
PU-HighTemp MF is rated for continuous service to 110°C (230 °F). It conducts heat at 0.3 W/m·K (0.173 BTU/hr·ft·°F), better than 95% of polyurethane grades. Thermal expansion is 50 µm/m·K (27.8 µin/in·°F).
Electrical5
PU-HighTemp MF is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil).
Chemical & Environmental2
UV resistance is poor.
Sustainability3
Producing a kilogram of PU-HighTemp MF takes about 100 MJ of energy and emits 5.2 kg of CO₂ — less than 83% of polyurethane grades. Typical recycled content is 0%.
Manufacturability4
PU-HighTemp MF's machinability is good (55/100, worse than 64% of polyurethane grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PU-HighTemp MF
Is PU-HighTemp easy to machine?
After full cure it mills, drills and taps with sharp carbide at high spindle speed and light feed; avoid local heat build-up that softens the surface. Extract dust at the tool.
Can PU-HighTemp be welded?
Thermoset — no heat welding is possible. Assemble with epoxy or cyanoacrylate adhesive, threaded inserts or self-tapping screws.
Can PU-HighTemp be formed, bent or molded?
Vacuum casting: weigh A and B accurately by mass, degas and pour into silicone moulds preheated to 60–80 °C. The manufacturer's stepped oven post-cure (typically 80 °C for 2–4 h plus 100–120 °C) is mandatory to reach the rated HDT; heat-resistant formulations have a short working life and shorten silicone mould life compared with room-temperature PU.
What surface finishes work on PU-HighTemp?
Sands, primes, paints, screen-prints and vacuum-metallises (aluminium) well. Aromatic systems without a UV additive need a UV-blocking topcoat to prevent yellowing.
PU-HighTemp 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, high functiA-side base; short-chain polyol raises crosslink density and Tg | 35 – 60 | 45 |
| chain extender / crosslinker (diol, diam | 1 – 8 | 3 |
| mineral / glass or aluminium fillerfilled variants only; 0 in unfilled grades | 0 – 45 | 0 |
| flame retardant (phosphorus / ATH)FR V-0 variants only | 0 – 25 | 0 |
| catalyst, UV stabilizer, pigment, defoam | 0.1 – 3 | 1 |
| isocyanate (MDI / modified pMDI)B-side; aliphatic HDI/IPDI for clear and weatherable variants | ≥ 35 (balance) | — |
PU-HighTemp MF — frequently asked
What is PU-HighTemp MF used for?
PU-HighTemp MF is typically used for under-hood prototypes, reflow-adjacent housings, thermal cycling test parts and lighting fixture prototypes. In short: highest service temperature PU; 110 °C cast prototypes; post-cure sets the HDT.
What is the tensile strength of PU-HighTemp MF?
PU-HighTemp MF has a typical tensile strength of 58 MPa (8.41 ksi) — stronger than 71% of polyurethane grades. Strength varies by condition: see the 7 listed tempers.
Is PU-HighTemp MF easy to machine?
Reasonably — machinability is rated good (55/100, worse than 64% of polyurethane grades). After full cure it mills, drills and taps with sharp carbide at high spindle speed and light feed; avoid local heat build-up that softens the surface. Extract dust at the tool.
Can PU-HighTemp MF be welded?
Thermoset — no heat welding is possible. Assemble with epoxy or cyanoacrylate adhesive, threaded inserts or self-tapping screws.
What surface finishes work on PU-HighTemp MF?
Sands, primes, paints, screen-prints and vacuum-metallises (aluminium) well. Aromatic systems without a UV additive need a UV-blocking topcoat to prevent yellowing.
Can PU-HighTemp MF be formed, bent or molded?
Vacuum casting: weigh A and B accurately by mass, degas and pour into silicone moulds preheated to 60–80 °C. The manufacturer's stepped oven post-cure (typically 80 °C for 2–4 h plus 100–120 °C) is mandatory to reach the rated HDT; heat-resistant formulations have a short working life and shorten silicone mould life compared with room-temperature PU.
What is the maximum service temperature of PU-HighTemp MF?
PU-HighTemp MF is rated for continuous use to about 110°C (230 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ISO 75-2 Plastics — Determination of temperature of deflection under load — ISO (2013)
- Polyurethanes Handbook (thermoset casting systems) — Hanser (1994)
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.