3Dresyn HDPE-like vs polyolefin-like and low-modulus SLA / DLP / LCD 3D printing resins
Mechanical Resistance Comparison & Executive Summary
3Dresyn HDPE-like is a low-modulus engineering photopolymer designed to approximate the practical behaviour of high-density polyethylene-like parts in additive manufacturing. It is positioned for applications requiring low stiffness, useful deformation tolerance and impact-friendly functional behaviour rather than rigid structural performance.
With flexural strength below 30 MPa, elongation below 100%, Young’s modulus below 800 MPa and Shore D 60, HDPE-like occupies the soft engineering segment between PP-like materials and more flexible LDPE-like systems.
Choose HDPE-like when the goal is controlled low-rigidity behaviour, resilient deformation and functional toughness, not structural stiffness or dimensional rigidity.
Data Table — Typical Properties (post-cure; internal data and competitor TDS)
| Resin | Flexural strength | Elongation | Young’s modulus | Noted traits |
|---|---|---|---|---|
| 3Dresyn HDPE-like | <30 MPa | <100% | <800 MPa | Low-modulus engineering behaviour; Shore D 60; Tg <25 °C; deformation-tolerant response. |
| Formlabs Durable | ~24 MPa | ~55–75% | Low modulus | Closed ecosystem; PP-like/durable behaviour; somewhat stiffer than a soft HDPE-like target. |
| Liqcreate Tough-X | Impact-focused | 100–150% | Lower stiffness | Very ductile; open systems; may behave softer or more elongation-driven than HDPE-like balance. |
| Flexible engineering families | Varies | Varies | Low-to-medium | Broad category; many grades are either too soft or too tough-focused for HDPE-like use. |
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Comparability note: Polyolefin-like behaviour in photopolymers is generally approximated through low-modulus, deformation-tolerant systems. Comparisons should normalize modulus, elongation and post-curing conditions.
Where 3Dresyn HDPE-like Wins
1) Low-rigidity engineering behaviour
- HDPE-like is positioned for parts requiring softer structural response and deformation tolerance without moving to extremely soft elastomeric systems.
2) Useful for resilient functional parts
- Suitable for containers, covers, low-stress shells, compliant technical parts and impact-tolerant lightweight geometries.
3) Better fit than rigid engineering materials for deformation-driven use
- Where rigid materials crack or lose functionality, HDPE-like provides a more forgiving mechanical window.
Application Guidance
- Choose 3Dresyn HDPE-like for: low-rigidity technical parts, resilient covers, compliant housings and functional geometries requiring high deformation tolerance.
- Choose PP-like if more shape retention is needed.
- Choose LDPE-like if even softer deformation behaviour is required.
Processing Notes (Quick Start)
- Compatible with open SLA, DLP and LCD systems in the 385–405 nm range.
- Use validated cure conditions to preserve target softness and avoid over-stiffening.
Normalization & Caveats
- HDPE-like positioning is an engineering behaviour analogy, not direct equivalence to molded HDPE.
- Mechanical behaviour depends strongly on thickness, geometry and post-curing.
References
- 3Dresyn HDPE-like internal product data
- Formlabs Durable TDS
- Liqcreate Tough-X TDS
- Relevant flexible engineering resin documentation