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Axson UP 3691 Vacuum Casting Material
For prototypes that must survive severe mechanical stress, vibration, or impact without fracturing, Axson UP 3691 is the ultimate solution. This premium polyurethane resin is engineered to simulate the properties of ABS/PC alloys (Polycarbonate/ABS blends) or high-grade PC. Unlike standard resins that prioritize either stiffness or flexibility, UP 3691 delivers both: it provides the structural rigidity of engineering plastics while maintaining exceptional shock absorption capabilities. At JUCHENG, we recommend this material for "crash-proof" functional models, handheld devices undergoing drop tests, and demanding automotive components.
Axson UP 3691

Basic Characteristics & Composition

Axson UP 3691 is a three-component system designed for high-performance applications where failure is not an option.
  • ABS/PC Simulation: It mimics the premium feel and mechanical performance of high-end injection molded thermoplastics used in safety equipment.
  • Extreme Impact Resistance: It offers one of the highest impact strength ratings among vacuum casting resins, resisting cracks even under sudden blows.
  • Rigidity: Unlike PP-like resins (which are flexible), UP 3691 remains rigid and holds its shape under load, making it suitable for structural housings.
  • Temperature Stability: Offers better heat resistance than standard ABS simulants, maintaining properties in warm environments.
Axson UP 3691 prototype

Color Options

  • Standard: White / Off-White.
  • Coloring: The neutral base color allows for easy tinting to specific RAL/Pantone shades during the casting process.
  • Finishing: Its rigid surface is excellent for sanding and painting. It is an ideal substrate for high-gloss automotive finishes or soft-touch coatings.

Key Technical Parameters

1. Mechanical Properties (Typical values after post-curing):
Property Value Unit Standard
Hardness 80 - 84 Shore D ISO 868
Flexural Modulus 2,000 - 2,200 MPa ISO 178
Tensile Strength 60 - 65 MPa ISO 527
Elongation at Break 15 - 20 % ISO 527
Heat Deflection Temp (HDT) 90 - 95 kJ/m² ISO 179
Impact Strength (Charpy) > 70 °C ISO 75
Linear Shrinkage 0.3 - 0.4 % -

2. PROCESSING 
  • Mixing: Requires precise mixing of Polyol, Isocyanate, and often a Catalyst to control the reaction speed and final properties.
  • Vacuum Casting: Must be processed in a vacuum chamber to eliminate micro-bubbles which would act as stress concentrators and reduce impact strength.
  • Pot Life: Short (approx. 5-8 minutes). JUCHENG technicians must work quickly and efficiently to fill molds.
Demolding: 60 - 90 minutes at 70°C.
 
3. PRECAUTIONS 
  • Moisture Sensitivity: Highly sensitive to humidity. Material containers are purged with nitrogen after use.
  • Mold Life: Can be slightly more aggressive to silicone molds than standard resins; we use protective release agents.

4. STORAGE 
  • Conditions: Store in a dry place between 15°C and 25°C.
 

Application Scenarios & Fields

Axson UP 3691 is the standard for durability testing:
  • Automotive: Bumpers, crash-test dummies components, dashboard structures, door panel clips.
  • Consumer Electronics: Handheld device housings (mobile phones, scanners) subjected to drop testing.
  • Protective Equipment: Helmet shells, knee pads, hard-shell luggage prototypes.
  • Industrial: Power tool casings (drills, saws) that must withstand vibration and abuse.

Vacuum Casting Process Compatibility

  • Silicone Tooling: Compatible with standard silicone molds.
  • Inserts: Excellent for encapsulating metal inserts (threaded brass inserts) due to its high strength holding the metal securely.
  • Machining: Cured parts are rigid and machine much like real ABS/PC. They can be drilled, tapped, and CNC machined for modifications.

Advantages vs. Limitations

Advantages Limitations
Superior Toughness: Combines rigidity with high shock absorption. Pot Life: Very short working time limits the maximum casting size/weight.
High Modulus: Stiffer than PP/PE simulants; holds dimensional tolerance well. Cost: Premium high-performance resin is more expensive than standard types.
Heat Resistance: Good thermal stability (~95°C). Complexity: Three-component mix requires precise handling.
Paintability: Excellent surface for cosmetic finishing.  

Manufacturers & Alternatives

  • Manufacturer: Sika Axson.
  • Alternatives at JUCHENG:
If you need more flexibility (PP-like): We recommend Axson UP 5690.
If you need lower cost (Standard ABS): We recommend Hei-Cast 3012.
If you need transparency: We recommend Axson PX 527 (High impact clear).
Learn more about ABS type materials
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