PX223 · heat-treated state
PX223-HT
Properties of the HT condition, compared with the other PX223 grades.
Pick when the part must survive short heat exposure (paint bake, under-hood mock-up); needs a post-cure cycle near 100 °C.
What is PX223-HT?
PX223-HT is PX223 heat treated to HT — pick when the part must survive short heat exposure (paint bake, under-hood mock-up); needs a post-cure cycle near 100 °C. PX223-HT has a tensile strength of 65 MPa (9.43 ksi), stronger than 72% of polymer grades. Elongation at break is 8% and the elastic modulus is 2.3 GPa (0.334 Msi). PX223-HT has a density of 1.12 g/cm³ (0.0405 lb/in³), lighter than 63% of polymer grades. Its glass-transition temperature is 110°C (230 °F). Standard is the default condition FabDigit quotes; HT is available on request or by drawing note.
Advantages
- Low, predictable mold shrinkage — 0.15%, better than 97% of polymer grades
- Easy to machine — 80/100, better than 83% of polymer grades
- Polishes to a fine finish — 70/100, better than 78% of polymer grades
Limitations
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
PX223-HT properties
Typical room-temperature values for PX223-HT — 10 properties are specific to this condition; the rest are grade-level values shared by every PX223 grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical3
PX223-HT has a density of 1.12 g/cm³ (0.0405 lb/in³), lighter than 63% of polymer grades. Its glass-transition temperature is 110°C (230 °F).
Mechanical9
PX223-HT has a tensile strength of 65 MPa (9.43 ksi), stronger than 72% of polymer grades. Elongation at break is 8% and the elastic modulus is 2.3 GPa (0.334 Msi).
Thermal9
PX223-HT is rated for continuous service to 95°C (203 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 90 µm/m·K (50 µin/in·°F).
Electrical3
PX223-HT is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil).
Chemical & Environmental2
UV resistance is poor.
Sustainability3
Producing a kilogram of PX223-HT takes about 100 MJ of energy and emits 5 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 0%.
Manufacturability4
PX223-HT's machinability is very good (80/100, better than 83% of polymer grades).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PX223 grades and fills
PX223 is also supplied in 2 other conditions. The full side-by-side table is on the PX223 overview.
- StandardDefaultDefault choice for ABS-like prototype and small-series parts cast in silicone moulds at ≤70 °C service.60 MPa tensile
- HTPick when the part must survive short heat exposure (paint bake, under-hood mock-up); needs a post-cure cycle near 100 °C.65 MPa tensile
Working with PX223-HT
Is PX223 easy to machine?
Machines and sands easily with sharp carbide tools and light feeds; use dust extraction and avoid overheating which softens the surface.
Can PX223 be welded?
Thermoset — cannot be welded; join with cyanoacrylate, two-part epoxy or PU adhesive, or cast-in inserts.
Can PX223 be formed, bent or molded?
Degas both components, mix at the datasheet ratio, vacuum-cast into silicone moulds and demould after roughly 30–60 min at 65–70 °C; HT version needs an added high-temperature post-cure.
What surface finishes work on PX223?
Sands and primes readily; standard practice is filler-primer plus 2K PU or acrylic topcoat, and it accepts vacuum metallising or texture paints.
PX223 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 blend (polyether/polyester componamine/tin catalysed, may contain fillers and pigments | 60 – 70 | 65 |
| MDI-based polyisocyanate (component B)aromatic isocyanate prepolymer | 30 – 40 | 35 |
| colour paste / additivesoptional pigment, degassing and release additives | 0 – 3 | 1 |
PX223-HT — frequently asked
What is PX223-HT used for?
PX223-HT is typically used for vacuum casting prototypes, small-batch appearance housings, assembly and fit-check parts, pre-production enclosure samples, pigmented colour models and painted and vacuum-metallised display parts. In short: general-purpose photopolymer resin.
What is the tensile strength of PX223-HT?
PX223-HT has a typical tensile strength of 65 MPa (9.43 ksi) — stronger than 72% of polymer grades. Strength varies by condition: see the 3 listed tempers.
Is PX223-HT easy to machine?
Yes — machinability is rated very good (80/100, better than 83% of polymer grades). Machines and sands easily with sharp carbide tools and light feeds; use dust extraction and avoid overheating which softens the surface.
Can PX223-HT be welded?
Thermoset — cannot be welded; join with cyanoacrylate, two-part epoxy or PU adhesive, or cast-in inserts.
What surface finishes work on PX223-HT?
Sands and primes readily; standard practice is filler-primer plus 2K PU or acrylic topcoat, and it accepts vacuum metallising or texture paints.
Can PX223-HT be formed, bent or molded?
Degas both components, mix at the datasheet ratio, vacuum-cast into silicone moulds and demould after roughly 30–60 min at 65–70 °C; HT version needs an added high-temperature post-cure.
What is the maximum service temperature of PX223-HT?
PX223-HT is rated for continuous use to about 95°C (203 °F), and briefly to 90°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PX223-HT?
Yes — PX223-HT is available for injection molding and 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- PX 223 / PX 223 HT polyurethane vacuum casting resin technical datasheet — Axson Technologies (Sika Advanced Resins) (2019)
- Polyurethanes: Science, Technology, Markets and Trends — Wiley (2014)
- Rigid polyurethane casting resin property ranges — CES EduPack / Ashby material data (2021)
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.