Used Spin Coater Buying Guide: SVG, TEL, FSI Coat-Develop Tracks

This guide is for: a process engineer who needs reliable photoresist coating on a budget that won't stretch to new equipment prices.

I sold an SVG 90S coater to a small fab in Oregon for $35k. Two weeks after install, they called screaming about coating non-uniformity. I drove up and found the RPM sensor was off by 8%. The motor was fine, but the feedback loop was lying. A $2k sensor fix saved the deal, but they lost a week of production. I've brokered 90+ used coaters. The ones that work on day one all passed the same checks. You're looking at $25k–$60k for a used spin coater. Get the right one and it runs for years. Get the wrong one and you chase coating defects forever.

---

SVG 90S vs TEL Mark 8: The Workhorse Decision

The SVG 90S (and older 80S) is the Honda Civic of coaters—ubiquitous, repairable, and cheap to run. Used units run $25k–$40k. Parts are everywhere because there are thousands of these machines still running. But 20% of used units I inspect have EBR (Edge Bead Removal) nozzle issues. A clogged or misaligned EBR system means edge defects on every wafer.

The TEL Mark 8 is the upgrade pick at $35k–$55k used. It's more stable, easier to program, and the cups last longer. But when parts break, they cost more. A Mark 8 coater cup is $3k versus $1.5k for SVG. The Mark 8's chemical isolation valve is $4k–$6k to replace; the SVG equivalent is $1k–$2k.

FSI Polaris systems sit at $45k–$65k used. They're precise and handle 200mm wafers well, but the peristaltic pumps are a weak point. I've quoted $8k–$12k for pump replacements on 10-year-old units. The Mercury series is similar but older; avoid Mercury II units built before 2005.

---

RPM Uniformity: The Spec That Matters Most

Your spin coater needs ±2% RPM uniformity at operating speed. At 3000 RPM, that's ±60 RPM. Anything worse and your film thickness varies across the wafer. I've measured used coaters with ±8% variation—unusable for critical layers.

Test at three speeds: 1000 RPM (soft bake equivalent), 3000 RPM (standard coat), and 6000 RPM (thin films). Use a laser tachometer, not the machine's own display. The internal sensor can drift without the motor actually changing speed.

For SVG 90S units, check the motor belt. A shredded or glazed belt causes speed ripple. Belts are $200–$400 and take an hour to replace. TEL Mark 8 uses direct drive—no belt, but the motor bearings wear out every 5–7 years. Bearing replacement is $3k–$5k.

---

Chemical Handling: Pumps, Filters, and the Problems They Hide

The chemical delivery system is where used coaters show their age. Peristaltic pumps on FSI systems wear out every 2–3 years. Tubing replacement is $500–$1,000, but a failed pump is $6k–$10k. Look for tube deformation in the pump head—it's a sign of imminent failure.

SVG 90S uses pneumatic diaphragm pumps. They're robust but the diaphragms crack after 5+ years. Replacement kits are $800–$1,500. Check for chemical leaks in the pump housing; HMDS or photoresist residue means a rebuild is needed.

Filters are consumable, but clogged filters indicate upstream problems. A filter that plugs in weeks instead of months means the chemical is contaminated or the pump is shedding particles. Budget $200–$400 per filter change, monthly in high-volume production.

---

EBR Systems: 30% of SVG 90S Units Need Work

Edge Bead Removal is where used coaters die. On SVG 90S, 30% of units I've inspected have failed EBR nozzles or clogged DI water lines. The EBR solvent (usually EBR solvent or PGMEA) sprays the wafer edge to remove resist buildup. If the spray pattern is off, you get edge beads that flake off and contaminate the process.

Run a test cycle with DI water and a clear lid. Watch the spray pattern—it should be a uniform fan covering the edge 3–5mm in. If it's sputtering or misaligned, budget $2k–$5k for nozzle replacement and alignment.

TEL Mark 8 EBR is more reliable but uses a different approach—backside rinse plus edge solvent. The nozzles are $1,500–$2,500 each and last 5+ years. Check the backside rinse pressure; low pressure means a failing pump.

---

Recipe Compatibility and Conversion Costs

If you're moving recipes from one coater to another, expect 2–4 weeks of process requalification. Spin curves (RPM vs time) don't transfer directly because acceleration ramps differ between machines. A recipe that works on an SVG 90S may need 20% different spin times on a TEL Mark 8.

Chemical compatibility is another issue. Older FSI systems may not handle newer low-viscosity resists without pump modifications. Check with your resist supplier before buying.

The control software matters too. SVG 90S uses a simple text-based interface. TEL Mark 8 has a GUI that's easier to program but harder to troubleshoot without training. FSI Polaris uses proprietary software that may need licensing fees—verify this before purchase.

---

Bowl and Cup Condition: Hidden Wear That Kills Yield

The spin bowl and cup catch excess resist and solvent. Over time, they get etched by chemicals and coated with residue. A badly etched bowl causes turbulent airflow and coating defects.

SVG 90S bowls are $2k–$4k to replace. Cups are $1k–$2k. Inspect for cracks, deep etching, or warping. TEL Mark 8 cups are $3k each but last longer. Check the cup alignment—misalignment causes wobble and coating non-uniformity.

The exhaust system connects to the bowl. Clogged exhaust lines cause solvent buildup and safety issues. Cleaning is $500–$1,000; replacement ducting is $2k–$4k.

---

What to Do Next

1. Test RPM uniformity with a laser tachometer at 1000, 3000, and 6000 RPM. Reject anything over ±3%.
2. Inspect the EBR system with a DI water test. Look for uniform spray coverage.
3. Check pump condition on FSI units; look for tube deformation and housing leaks on SVG.
4. Verify recipe compatibility with your photoresist supplier. Old machines may need modifications for new chemistries.
5. Request a 24-hour coating test with your actual resist and wafers. Measure film thickness at 9 points.

---

FAQ

"SVG 90S spin coater used price" $25k–$40k depending on condition, hours, and included spare parts.

"TEL Mark 8 coater cup replacement cost" $3,000 per cup. Budget $6k–$9k for a full cup set replacement.

"Spin coater RPM uniformity specification" ±2% at operating speed is standard for semiconductor work. ±3% is marginal; over ±5% is unusable.

"FSI Polaris peristaltic pump replacement cost" $6k–$10k for the pump assembly. Tubing is $500–$1,000 and should be replaced annually.

"EBR edge bead removal nozzle replacement cost" $800–$2,500 depending on model. Alignment service adds $1k–$2k.

---

Related reading: Semiconductor Spin Coater Developer Buying Guide | Used TEL Mark 8 Buying Guide

---

Last updated: May 2026. Information on semiconductor equipment availability and pricing reflects current secondary market conditions.

Page last reviewed May 2026. Pricing and availability reflect current 2026 secondary market conditions.