PU-PMMA-like MIN (Mineral-filled rigid grade)
Reinforced grade
Use for large flat opaque panels where dimensional stability matters more than transparency.
Values for the MIN condition
Other PU-PMMA-like grades and fills
PU-PMMA-like is listed in 5 conditions; see the grade overview at PU-PMMA-like.
Compare all 5 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact-modified / tough clear | Choose for snap-fits, thin walls or drop-tested transparent housings where full optical clarity is not required. | 42 | 50 | 35 | 76 Shore D |
MINThis page Mineral-filled rigid grade | Use for large flat opaque panels where dimensional stability matters more than transparency. | — | 45 | 2.5 | — |
Flame-retardant casting grade | Specify for electrical enclosure or lighting prototypes needing a flame rating; clarity is usually lost. | 50 | 55 | 6 | 85 Shore D |
Tinted / pigmented | Use for smoked lenses, coloured light guides or self-coloured show parts, avoiding paint on transparent geometry. | 55 | 62 | 9 | 83 Shore D |
Heat-resistant clear | Use for lamp lenses or parts near heat sources needing HDT above ~90 °C; slightly more brittle. | 66 | 70 | 5 | 86 Shore D |
What is PU-PMMA-like MIN?
PU-PMMA-like MIN is PU-PMMA-like in the MIN grade — use for large flat opaque panels where dimensional stability matters more than transparency. PU-PMMA-like MIN has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 45 MPa (6.53 ksi) — stronger than 100% of polyurethane grades. Elongation at break is 2.5% and the elastic modulus is 4.2 GPa (0.609 Msi). PU-PMMA-like MIN has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 75°C (167 °F).
Advantages
- High strength — 58 MPa (8.41 ksi), better than 100% of polyurethane grades
- Stiff — 4.2 GPa (0.609 Msi), better than 100% of polyurethane grades
- Low, predictable mold shrinkage — 0.08%, better than 100% of polyurethane grades
- Polishes to a fine finish — 85/100, better than 98% of polyurethane grades
- Good UV / weathering resistance — 55/100, better than 95% of polyurethane grades
Limitations
- Limited ductility — 2.5%, worse than 100% of polyurethane grades
- Heavy — 1.45 g/cm³ (0.0524 lb/in³), worse than 95% of polyurethane grades
PU-PMMA-like MIN properties
Typical room-temperature values for PU-PMMA-like MIN; 11 are specific to this condition. Other listed values are PU-PMMA-like reference data and may not represent this condition. Bars are the position among polyurethane grades.
Physical6
PU-PMMA-like MIN has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 95% of polyurethane grades. Its glass-transition temperature is 75°C (167 °F).
Mechanical15
PU-PMMA-like MIN has a yield strength of 58 MPa (8.41 ksi) and a tensile strength of 45 MPa (6.53 ksi) — stronger than 100% of polyurethane grades. Elongation at break is 2.5% and the elastic modulus is 4.2 GPa (0.609 Msi).
Thermal11
PU-PMMA-like MIN is rated for continuous service to 70°C (158 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 60% of polyurethane grades. Thermal expansion is 55 µm/m·K (30.6 µin/in·°F).
Electrical6
PU-PMMA-like MIN is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 74% of polyurethane grades. UV resistance is good.
Sustainability4
Producing a kilogram of PU-PMMA-like MIN takes about 105 MJ of energy and emits 5.2 kg of CO₂ — more than 64% of polyurethane grades. Typical recycled content is 0%.
Manufacturability7
PU-PMMA-like MIN's machinability is good (60/100, better than 52% of polyurethane grades); weldability not recommended (5/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PU-PMMA-like MIN
Is PU-PMMA-like easy to machine?
Machines and drills easily with sharp carbide and low feed pressure; avoid heat build-up and stress-crazing near clear surfaces, and support thin walls to prevent chipping.
Can PU-PMMA-like be welded?
Thermoset — cannot be heat-welded; join with cyanoacrylate, two-part PU or acrylic-based structural adhesive.
Can PU-PMMA-like be formed, bent or molded?
Degas both components, vacuum-cast into a silicone mould at 25–40 °C resin temperature, demould after 20–60 min and oven post-cure 60–75 °C for 2–4 h to reach full Tg and clarity.
What surface finishes work on PU-PMMA-like?
Sand progressively to 2000–3000 grit then buff, or apply a clear PU/acrylic topcoat for optical gloss; can be dyed in the mix, vapour-polished only with caution, and takes primer/paint well.
PU-PMMA-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 |
|---|---|---|
| aliphatic polyisocyanate (HDI/IPDI-basedaliphatic chemistry chosen for non-yellowing clarity | 40 – 55 | 48 |
| catalyst (organometallic/amine) | 0.01 – 0.5 | 0.1 |
| UV absorber + HALSpresent in UV-stabilized variant | 0 – 1.5 | 0.5 |
| degassing / flow additive | 0 – 1 | 0.3 |
| pigment paste or mineral fillervariant-dependent; zero in clear default | 0 – 40 | 0 |
| polyol blend (polyester/polyether polyoltypical mix ratio 100:90–100:110 by weight | ≥ 45 (balance) | — |
PU-PMMA-like MIN — frequently asked
What is PU-PMMA-like MIN used for?
PU-PMMA-like MIN is typically used for lens prototypes, display cases, signage models and optical demonstration parts. In short: highest-gloss clear PU; acrylic look, no tooling; rigid transparent prototype resin.
What is the yield strength of PU-PMMA-like MIN?
PU-PMMA-like MIN has a typical yield strength of 58 MPa (8.41 ksi) and a tensile strength of 45 MPa (6.53 ksi) — stronger than 100% of polyurethane grades. Strength varies by condition: see the 5 listed tempers.
Is PU-PMMA-like MIN easy to machine?
Reasonably — machinability is rated good (60/100, better than 52% of polyurethane grades). Machines and drills easily with sharp carbide and low feed pressure; avoid heat build-up and stress-crazing near clear surfaces, and support thin walls to prevent chipping.
Can PU-PMMA-like MIN be welded?
Not readily — weldability is rated not recommended (5/100). Thermoset — cannot be heat-welded; join with cyanoacrylate, two-part PU or acrylic-based structural adhesive.
What surface finishes work on PU-PMMA-like MIN?
Sand progressively to 2000–3000 grit then buff, or apply a clear PU/acrylic topcoat for optical gloss; can be dyed in the mix, vapour-polished only with caution, and takes primer/paint well.
Can PU-PMMA-like MIN be formed, bent or molded?
Degas both components, vacuum-cast into a silicone mould at 25–40 °C resin temperature, demould after 20–60 min and oven post-cure 60–75 °C for 2–4 h to reach full Tg and clarity.
What is the maximum service temperature of PU-PMMA-like MIN?
PU-PMMA-like MIN is rated for continuous use to about 70°C (158 °F), and briefly to 100°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- PX223 / PX223HT clear polyurethane casting resin technical data — Axson Technologies (Sika) (2020)
- UPX 8400 / clear vacuum-casting PU resin data sheets — Huntsman Advanced Materials (2019)
- Hei-Cast series polyurethane casting resins — H&K / Hei-Cast (2021)
- ISO 527 / ISO 178 / ISO 75 plastics test methods — ISO (2019)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — 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.