Otoplastics 3Dresyn OTO-UHT – Ultra-Hard and Tough Resin

Tough and rigid photopolymer for otoplastics and hearing-related components (UHT bio-based system)

Product description

3Dresyn OTO-UHT is an advanced photopolymer engineered for the fabrication of ultra-hard and tough otoplastics and hearing-related components.

The material provides a balanced combination of stiffness and toughness, enabling durable performance under mechanical stress while maintaining dimensional stability.

The formulation is based on an Ultra-High-Toughness (UHT) architecture with bio-based components, supporting reliable performance in demanding audiology applications.

It is compatible with a wide range of SLA, DLP and LCD systems used in professional audiology and dental laboratories.

Application framework

Intended for professional use in vat photopolymerization (SLA, DLP and LCD) additive manufacturing for audiology and otoplastics workflows.

Final suitability of printed parts must be validated by the user according to the specific application, processing conditions and applicable regulatory requirements.

Typical applications

• Custom otoplastics and earmolds
• Hearing aid shells and housings
• In-ear acoustic components
• Durable components requiring toughness and rigidity

Measured mechanical properties

• Tensile strength: < 50 MPa (ISO 527-1 / ISO 527-2)
• Flexural strength: < 80 MPa (ISO 178)
• Young’s modulus: < 2500 MPa (ISO 527)
• Elongation at break: < 30 % (ISO 527)
• Impact resistance, Notched Izod: < 30 J/m (ISO 180:2023)
• Shore hardness: D80± 2 (ISO 868)

Measured physical properties

• Viscosity: < 3000 mPas at 23°C ± 2°C (ISO 3219)
• Density: 1.0-1.2 g/cm³ (ISO 1183)
• Water absorption: < 0.05 % (24 h at 23°C) (ISO 62)

Processing-related characteristics

• Shrinkage: very low (typical)
• Resolution capability: very high (process-dependent)
• Flow and recoating behaviour: optimized for reliable printing performance

Functional performance characteristics

• Balanced toughness and rigidity for durable components
• High resistance to mechanical stress and fracture
• Excellent dimensional accuracy and stability
• Suitable for thin-walled and precision geometries
• Consistent performance in repeated use environments

Printing & processing guidelines

• Printing technologies: SLA, DLP and LCD
• Wavelength range: 385–405 nm
• Compatible with most commercial and professional systems when properly calibrated
• Low viscosity enabling stable recoating and processing
• Very high resolution capability for fine details
• Follow 3Dresyns IFU for exposure, washing and post-curing

Workflow recommendations

• Optimize exposure parameters for mechanical performance and accuracy
• Validate processing workflow for final application requirements

Biocompatibility & quality framework

• Bio-based formulation
• Biocompatibility-related testing may be performed under controlled laboratory conditions
• Evaluation frameworks may include ISO 10993 methodologies
• Manufacturing aligned with ISO 13485 quality management systems
• Organo-tin free formulation
• Final biological performance depends on validated processing workflow

Testing & processing disclaimer

Material properties are measured on printed and post-processed specimens and may vary depending on printer type, printing parameters, build orientation, post-curing conditions and workflow validation. Reported values are indicative and provided for reference only.

Regulatory & legal notice

This material is supplied as a professional manufacturing material for audiology and otoplastics workflows and is not marketed as a finished medical device. The regulatory classification, conformity assessment and validation of any final device manufactured using this material remain the sole responsibility of the legal manufacturer in accordance with applicable regulations.

Why choose 3Dresyn® OTO-UHT

• Ultra-high toughness with balanced rigidity
• Bio-based formulation
• High dimensional stability and durability
• Very high resolution and low shrinkage
• Compatible with SLA/DLP/LCD systems
• Organo-tin free formulation

Document reference: TDS-OTO-UHT-EN | Version: 1.0 | Last updated: March 2026