When setting up a thin film process, many engineers are torn between dip coating and spin coating. Both use liquid to form films, but they differ in material loss, uniformity, and what shapes they can handle. Let’s compare the two. Plus, we’ll show you a smart way to test them without buying expensive equipment upfront.
1. Spin Coating: Pros and Cons
Spin coating spins a flat substrate at high speeds to spread the liquid.
- Pros
It makes highly uniform films very quickly on flat, round objects like wafers. - Cons
・High Material Loss: Over 90% of the liquid spins off and goes to waste. It’s not great for expensive materials.
・Shape Limits: It only works on flat surfaces, not on 3D or curved parts.
2. The Advantages of Dip Coating
Dip coating simply dunks the part and pulls it up.
- No Wasted Material
You only use what sticks to the part. The rest stays in the tank, making it highly cost-effective. - Handles Complex Shapes
If you can dip it, you can coat it—inside pipes, 3D shapes, you name it. - Scales Up Easily
With a bigger tank, you can coat long parts or large panels. Recently, SDI’s ultra-low speed technology (1 nm/sec) has made dip coating precision rival—or even beat—spin coating.
3. Bridging the Gap Between Theory and Reality
Theory is great, but you won’t know for sure until you test it on your actual parts. This is where buying equipment becomes a hurdle. Getting budget approval for a test machine is tough. Large companies demand endless paperwork. And the fear of failure makes people hesitate.
4. Smart Researchers Start with “Rental”
Many R&D teams skip the buying process and just rent. SDI offers a wide range of rental dip coaters, from small lab units to production-ready models.
- Budget Friendly
Rentals can use operational budgets (OPEX) instead of capital expense (CAPEX). - Fast Setup
Skip the heavy paperwork and start testing right away. - Prove It First
Test your idea on a rental, gather your data, and use that success to get budget approval for a purchase.
▼ From R&D to Mass Production! SDI’s Rental Equipment Lineup
https://www.sdicompany.com/en/rental/
Summary
Spin coating is fast for flat parts, but dip coating wins on material savings and complex shapes. The best way to decide is to try it yourself. If you want to test your process quickly without the red tape, our rental service is the perfect start.