Formlabs Alumina 4N Resin
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Formlabs Alumina 4N Resin
High-purity technical ceramic resin for printing dense alumina parts with extreme heat resistance, excellent mechanical strength, and chemical inertness — built for real industrial environments.
High purity + high density: 99.99% alumina (Al2O3) and 98.6% relative density after firing — comparable to traditionally manufactured alumina.
Extreme performance: Max working temperature up to 1500 °C, with excellent resistance to wear, abrasion, and harsh environments.
Strength you can engineer around: Flexural strength over 400 MPa and a modulus around 380 GPa (fired parts).
- Print complex internal channels, lattices, and geometries that are difficult or impossible with traditional ceramic manufacturing
- A strong option for heat/electrical insulation components, wear parts, chemical handling components, and high-temperature fixtures
- Best results come from following the wash/dry/firing steps exactly (this resin is sensitive to incorrect washing)
Workflow Overview (Read This Before Buying)
Alumina 4N Resin is not a “print-and-use” photopolymer. You’ll print a green ceramic part, then wash, dry, and fire it to achieve dense technical ceramic properties. Plan for the required consumables and kiln access.
What you need
- Compatible Formlabs SLA printer + latest PreForm/firmware
- Stainless Steel Build Platform or Build Platform 2 (required)
- Ceramic Wash Solution + Form Wash / Form Wash L (or dedicated finish kit setup)
- Kiln capable of ≥1600 °C + alumina setter plates (and ideally a dedicated burnout kiln)
Printing + washing (critical)
- Shake the cartridge briefly before printing to keep the resin mixed.
- Prefill the tank with ~300 mL of resin before starting (per Formlabs guidance).
- Wash parts for 2 minutes in Ceramic Wash Solution (use a dedicated wash bucket for this resin).
- Do NOT use water or IPA on the printed parts — incorrect washing can cause cracking.
- No UV post-cure required (allow parts to fully dry before firing).
Firing (debinding + sintering)
- Dry parts for 24 hours prior to firing.
- Fire on setter plates rated for at least 1700 °C.
- Formlabs recommends a two-furnace schedule (burnout then sinter). A commonly referenced schedule is ~4.5-day burnout + ~2-day sintering depending on your furnace and ramp/hold strategy.
Tip: Ceramic firing is process-sensitive. If you’re new to ceramic printing, ask us about best-practice setup and what to expect from shrinkage, supports, and handling.
Design Notes: Shrinkage & Scaling
Like other ceramics, Alumina 4N shrinks during firing. Formlabs guidance recommends designing/scaling to accommodate approximately:
- 21.8% horizontal shrinkage
- 26% vertical shrinkage
Scale your CAD model before importing to PreForm, and keep orientation consistent between scaling and printing.
Who It’s For
High-temperature + electrical insulation parts
- High-voltage housings, terminal blocks, connector covers, and insulating fixtures
- Heat-resistant components and insulating spacers
Ideal when polymers fail due to temperature, wear, or chemical exposure — and you need complex geometry.
Chemical + wear environments
- Chemically resistant components
- Abrasion/wear parts and tooling interfaces
Useful for labs, production lines, and R&D where ceramics are a functional requirement, not a nice-to-have.
Advanced R&D & prototyping
- Prototype complex ceramic geometries without custom tooling
- Short runs for validation before committing to traditional ceramic manufacturing
Perfect for teams that need iteration speed and design freedom in true alumina ceramic.
Results
Why teams choose Alumina 4N
- True technical ceramic: 99.99% alumina with high fired density.
- Extreme environment readiness: up to 1500 °C max working temperature.
- Mechanical performance: flexural strength > 400 MPa.
- Design freedom: complex internal channels + lattices + geometries without traditional tooling.
Important expectations
- Print times can be considerably longer than standard photopolymer resins.
- Washing and firing steps are not optional — they determine whether parts survive and hit target properties.
- Plan your firing setup (kiln capability, setters, schedule) before starting production work.
Tech Specs (At-a-Glance)
| Specification | Alumina 4N Resin |
|---|---|
| Material | Technical ceramic alumina (Al2O3) resin workflow (print + fire) |
| Purity | 99.99% |
| Relative Density (fired) | 98.6% |
| Max Working Temperature | Up to 1500 °C |
| Flexural Strength (fired) | > 400 MPa |
| CTE | ~5 ppm/K |
| Design Shrink Allowance | ~21.8% horizontal / ~26% vertical |
| Wash | 2 minutes in Ceramic Wash Solution (no water/IPA contact) |
| Post-cure | N/A (allow fully dry before firing) |
FAQ
1) Do I need special equipment beyond the printer?
Yes. You’ll need Ceramic Wash Solution + a washing setup, plus kiln access for burnout/debinding and sintering (≥1600 °C) with appropriate setter plates.
2) Can I wash parts in IPA like normal resin?
No. Alumina 4N parts should only be washed in Ceramic Wash Solution. Water or IPA contact can cause cracking.
3) Does it require UV post-curing?
No. Post-cure is listed as N/A. After washing, allow parts to fully dry before firing.
4) How much does it shrink?
Formlabs guidance recommends designing to accommodate ~21.8% horizontal and ~26% vertical shrinkage during firing (scale your CAD model before importing to PreForm).
5) What’s the shelf life?
About 3 months at room temperature. Refrigeration (-10 to 4 °C) can extend shelf life significantly (Formlabs recommends refrigerating this resin).
(70757)
| SKU | 70757 |
| Brand | Formlabs |
| Shipping Cubic | 0.110450000m3 |
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