SLA – RP 105W
RP 105W is an opaque white SLA 3D printing material designed for balanced strength, toughness, and fine detail. This RP 105W 3D printing material is a go‑to for general‑purpose prototypes that need crisp features and a clean, paint‑ready surface.
Choose RP 105W when you need high accuracy and professional surface quality without the brittleness of legacy resins. It is easy to clean and finish, supports a wide range of part sizes, and is ideal for fast visual/functional iterations. Like most SLA photopolymers, it is not intended for long‑term outdoor UV or high‑heat service.
Key Material Facts:
- Opaque white SLA resin with excellent detail and surface quality
- Balanced mechanical profile: good strength, stiffness, and toughness
- High dimensional accuracy; ideal for visual models and functional test fits
- Easy post‑processing: sands, primes, and paints well
- Typical layer thickness: 0.002–0.006 in (0.05–0.15 mm)
- Not recommended for sustained outdoor UV or elevated temperatures
- Great for prototypes
- Runs on our largest printer with a bed capable of making parts up to 55″ x 27″ x 19″ in size with not splits or glue joints.
- Compatible with assembly features including:
- Glue Joints / light welding
- Printed In Threads (However Helicoils are recommended)
Common Applications:
- Functional prototypes for fit, form, and light duty function
- Short‑run production components and snap‑fit studies
- Enclosures, bezels, and consumer product housings
- Automotive interior prototypes and validation jigs
- Aerospace conceptual models and wind‑tunnel shapes
- Architectural massing models and display parts
- Electronics brackets, covers, and connector guides
- Master patterns for silicone molding and paint/texture studies
Material Reference Data:
- For more information on how the SLA printing process works please check out this page.
- For SLA part design trick and tips check out this page.
- Material manufacturers website
SLA – RP 105W: Technical specifications
Mechanical Properties — RP 105W (UV postcure, typical values)
| Property | Typical Values (Units) | Notes |
| Hardness | 76–82 Shore D | |
| Tensile Modulus | 2180–2395 MPa | |
| Tensile Strength | 27–31 MPa | |
| Elongation at Break | 12–20% | |
| Flexural Modulus | 2690–2755 MPa | |
| Flexural Strength | 68–75 MPa | |
| Notched Izod Impact | 58–70 J/m | |
| HDT @ 66 psi | 55–65 °C | 131–149 °F |
| Glass Transition (Tg) | 55–70 °C | 131–158 °F |
| Density | 1.14–1.16 g/cm³ |
RP 105W provides a balanced stiffness and toughness profile, with tensile strength around 27–31 MPa and Shore D hardness ~76–82. It is well-suited for functional mockups and cosmetic parts but is not a high-impact or high-heat material.
Typical heat deflection temperature (HDT @ 66 psi) is ~55–65°C (131–149°F). For applications above this range, consider alternative materials or processes.
SLA in RP 105W supports tight feature definition and smooth surfaces. With appropriate design allowances and orientation, it achieves excellent detail fidelity suitable for snap-fit trials, covers, and enclosures. More information on 3DP part accuracy can be found here.
It’s best used indoors. Prolonged UV exposure may lead to yellowing and embrittlement. Consider painting or alternative materials for outdoor use.
Forerunner offers Levels 1–4, from support sanding through paint-prep show model finishes.
– Level 1 – Support Sanding
– Level 2 – Matte Finish
– Level 3 – Mold Master
– Level 4 – Paint Prep
– Level 5 – Cerakote
SLA – RP 105W: Part Gallery
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