ABS Axson UP4280 for Vacuum Casting Material

Axson UP4280 is a high-performance, two-component polyurethane resin designed for vacuum casting, offering exceptional detail reproduction (~50µm), high rigidity (Shore 80D), and mechanical properties similar to engineering plastics (tensile strength: 50–60 MPa, HDT: 80–100°C). Its low viscosity and minimal shrinkage (~0.1–0.3%) make it ideal for functional prototypes and low-volume production in automotive, aerospace, and consumer electronics. While it excels in accuracy and surface finish, it has limitations in impact resistance and UV stability. Alternatives include Smooth-Cast 300 and RenCast. Manufactured by Axson (Sika Group), UP4280 is a cost-effective solution for rigid, dimensionally stable parts but is less suited for flexible or high-temperature applications.

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ABS Axson UP4280 for Vacuum Casting Material
ABS Axson UP4280 for Vacuum Casting Material
Axson UP4280 is a high-performance, two-component polyurethane resin designed for vacuum casting, offering exceptional detail reproduction (~50µm), high rigidity (Shore 80D), and mechanical properties similar to engineering plastics (tensile strength: 50–60 MPa, HDT: 80–100°C). Its low viscosity and minimal shrinkage (~0.1–0.3%) make it ideal for functional prototypes and low-volume production in automotive, aerospace, and consumer electronics. While it excels in accuracy and surface finish, it has limitations in impact resistance and UV stability. Alternatives include Smooth-Cast 300 and RenCast. Manufactured by Axson (Sika Group), UP4280 is a cost-effective solution for rigid, dimensionally stable parts but is less suited for flexible or high-temperature applications.
Axson UP4280

Basic Characteristics

Axson UP4280 is a high-performance polyurethane (PU) resin specifically designed for vacuum casting, a rapid prototyping and low-volume production process. It replicates intricate details with high accuracy, making it ideal for functional prototypes, concept models, and end-use parts.
  • Color: Typically translucent/off-white (can be pigmented or painted).
  • Cure Type: Two-component (Part A + Part B), room-temperature curing.
  • Shore Hardness: ~80D (very rigid, similar to engineering plastics).
  • Viscosity: Low-to-moderate (~200–400 mPa·s), ensuring fine detail reproduction.

Key Technical Parameters

Property Value
Tensile Strength ~50–60 MPa
Elongation at Break 10–20%~5–10% (brittle behavior)
Flexural Modulus ~2500–3000 MPa
Impact Resistance Moderate (comparable to ABS)
Heat Deflection Temp (HDT) ~80–100°C (depends on post-cure)
Density ~1.1–1.2 g/cm³
Shrinkage ~0.1–0.3% (minimal, ensures dimensional stability)

Material Composition

  • Base Chemistry: Aromatic polyurethane (PU) resin.
  • Part A: Pre-polymer (isocyanate-rich).
  • Part B: Polyol-based hardener.
  • Additives: May include UV stabilizers, flex modifiers, or degassing agents.

Material Properties Table

Mechanical/Thermal Value
Hardness (Shore D) 80D
Tensile Strength 50–60 MPa
Flexural Strength 70–90 MPa
Thermal Conductivity Low (~0.2 W/m·K)
Glass Transition (Tg) ~60–80°C

Applications & Industries

  • Prototyping: Functional parts (housings, brackets, gears).
  • Automotive: Dashboards, air ducts, under-hood components.
  • Consumer Electronics: Enclosures, buttons, connectors.
  • Medical: Non-implantable device housings.
  • Aerospace: Lightweight interior components.

Suitability for Vacuum Casting

Advantages:
  • Excellent flowability for thin walls/complex geometries.
  • Low bubble formation (self-degassing properties).
  • High detail resolution (≤50µm features possible).
  • Post-processing: Paintable, drillable, glueable.
Limitations:
  • Brittleness (not ideal for high-impact applications).
  • Limited UV resistance (unless modified).
  • Moderate heat resistance vs. high-temp resins.

Manufacturers & Alternatives

Primary Supplier: Axson Technologies (now part of Sika AG).
Alternative Materials:
  • Smooth-Cast 300 (Polytek) – Similar rigidity, faster cure.
  • RenCast (Huntsman) – Higher temp resistance.
  • VYTAFLEX (BJB Enterprises) – More flexible options.

Why Choose UP4280?

  • High accuracy (near-injection-molding quality).
  • Fast turnaround (~24-hour demold time).
  • Cost-effective for 10–50+ copies vs. CNC/molding.
Best for: Engineers needing stiff, detailed prototypes with material properties close to ABS/PC. Not recommended for flexible or high-heat end-use parts.
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