Otoplastics 3Dresyn OTO-UHR MF – Ultra-High-Rigidity Monomer-Free Resin

Ultra hard and rigid photopolymer for otoplastics and hearing-related components (UHR monomer-free system)

Product description

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

The material delivers very high stiffness, dimensional stability and durability, enabling the production of precise and robust components for audiology applications.

The formulation is based on an Ultra High Rigidity (UHR) architecture combined with a Monomer-Free (MF) system, supporting controlled biocompatible workflows and stable long-term performance.

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 rigid housings
• In-ear acoustic components
• Precision rigid components for audiology devices

Measured mechanical properties

• Tensile strength: < 50 MPa (ISO 527-1 / ISO 527-2)
• Flexural strength: < 110 MPa (ISO 178)
• Young’s modulus: < 3000 MPa (ISO 527)
• Elongation at break: < 5 % (ISO 527)
• Impact resistance, Notched Izod: < 25 J/m (ISO 180:2023)
• Shore hardness: D88 ± 2 (ISO 868)

Measured physical properties

• Viscosity: < 10,000 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

• Ultra high rigidity for precise and stable components
• Excellent dimensional accuracy and long-term stability
• Durable under mechanical and thermal stress
• Suitable for thin-walled rigid structures
• Consistent performance across repeated use cycles

Printing & processing guidelines

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

Workflow recommendations

• Use validated cleaning and post-curing workflows for biocompatible applications
• Optimize exposure parameters for high accuracy and mechanical performance

Biocompatibility & quality framework

• Monomer-Free (MF) formulation supporting controlled biocompatible workflows
• 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-UHR MF

• Ultra high rigidity for precision otoplastics
• Monomer-free formulation for controlled workflows
• 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-UHR-MF-EN | Version: 1.0 | Last updated: March 2026