LY Grade Guide: Matching Luyang Grades to Your Application
Dalian Luyang operates a compact, well-documented LY grade family across PEEK, CFR-PEEK, PTFE, PI, glass- and carbon-reinforced PEEK. Choosing correctly between LY-101, LY-501, LY-601, and the filled grades is the difference between a component that lasts years and one that fails in weeks. This LY grade guide maps every major LY material to the engineering applications and loads where it performs best, built on verified data from Dalian Luyang's material properties table.
1. The Full LY Grade Map
Below is the master mapping table — your starting point whenever you shortlist an LY grade:
| LY grade | Family | Verification highlights | Best-fit applications |
|---|---|---|---|
| --- | --- | --- | --- |
| LY-101 / 102 / 103 | Virgin (unfilled) PEEK | ~95–97 MPa tensile, ~260 °C, Tg ~143–158 °C, water <0.07 % | Machined seals, inserts, spacers, bearing parts, general precision |
| LY-200 series | Glass-fibre-reinforced PEEK | ~152 MPa tensile, HDT >280 °C | Rigid load-bearing frames, structural housings, electrolyzer frames |
| LY-505 / LY-205-type | Wear-grade CFR-PEEK | ~202 MPa tensile, friction ~0.13, wear ~0.86 ×10⁻³ cm³ | Sliding, high-wear, heavy-load bearings and rings |
| LY-501 | Continuous CFR-PEEK | ~105 MPa tensile / 186 MPa flexural, ~260 °C | Lightweight structural plates, covers, brackets |
| LY-601 | Polyimide (PI) | ~360 °C continuous, Tg ~290 °C, HDT ~287 °C, wear 0.75 ×10⁻³ | Ultra-high-temperature wear, dry service |
| LY-401 / 403 / 405 | Filled PTFE sealing | Melting ~327 °C, continuous ~260 °C, low friction | Electrolyzer gaskets, chemical seals |
This matrix condenses the full specification tables referenced below into application-relevant choices.
2. Matching by Dominant Requirement
Different applications fail for different reasons. Match the dominant load/temperature first:
High temperature, especially ≥ 260 °C
- Continuous 260 °C PEEK envelope: LY-100-series PEEK and LY-200 glass-filled PEEK, both rated ~260 °C.
- Above 260 °C continuous: switch to LY-601 PI (~360 °C). Reserved for limited, spec-driven cases where thermoplastic melting/softening is unacceptable and cost is justified.
Wear and friction under sliding load
- LY-205-type wear CFR-PEEK leads on combined strength and low wear (friction ~0.13, wear ~0.86 ×10⁻³ cm³, tensile ~202 MPa).
- For loweschemical-friction dry sliders, PTFE grades (friction ~0.05–0.10 industry range; LY-40x ~0.16–0.17 measured) cover moderate-load cases.
Stiffness and light weight
- LY-501 continuous CFR-PEEK for structural plates where weight matters and load follows fibre orientation.
- LY-200 glass-filled PEEK for high-modulus, dimensionally stable frames with HDT >280 °C.
Chemical / electrolyzer wet service
- PTFE sealing grades (LY-401/403/405) inert to caustic and acidic electrolytes.
- PEEK (LY-100 series) for hydrolysis-resistant, insulating wet components and electrode frames.
3. Decision Matrix by Industry
| Industry / system | Typical parts | Recommended LY grade |
|---|---|---|
| --- | --- | --- |
| Electrol-series stacks | Electrode frames, gaskets, seals | LY-200 glass-filled PEEK (frames) + LY-401/403 PTFE (gaskets) |
| Semiconductor equipment | Handler rings, spacers, insulation | LY-101/102 virgin PEEK (insulation, stability) |
| High-speed bearings | Bearing cages | LY-102 or LY-205-type wear PEEK |
| High-pressure hydraulic seals | Back-up rings | LY-101 unfilled or LY-205-type wear PEEK |
| Ultra-high-temp wear | Gas-turbine/actuator sliders | LY-601 PI |
| Food / medical / metrology | Precision dimensionally stable parts | LY-101/102/103 virgin PEEK (low moisture, cleanable) |
4. How to Read the Verification Data
Two cautions when comparing LY grades:
- Continuous rating vs peak rating. "Continuous ~260 °C" is a long-term envelope; short-term peaks (e.g., ~300–310 °C for pure PEEK at industry baseline) are different and must not be conflated. See our thermal-management guide.
- Measure machine vs your part. The table gives ISO/UL material data, not part-level performance. Geometry, fibre direction, bolt load, and thermal history all shift real-world behaviour — validate on a prototype.
5. A Simple 4-Step Selection Flow
- Define the envelope: max continuous temp, peak temp, load, chemical media, required insulation/conductivity.
- Filter the family: PEEK (≤260 °C, insulating) → PI (higher temp) → PTFE (chemical gasket) → filled CFR-PEEK (wear/structural).
- Within family, pick grade: e.g., unfilled LY-101 vs wear LY-205 vs continuous LY-501 vs glass LY-200, by strength/wear/weight priority.
- Validate: confirm with an engineering resin manufacturer or your supplier, then prototype before volume.
Frequently Asked Questions
- How do I choose between LY-101, LY-501, and LY-601? LY-101 is the general-purpose virgin PEEK for seals and precision parts (≤260 °C); LY-501 is continuous CFR-PEEK for light, stiff structural plates; LY-601 is polyimide for service above ~260 °C up to ~360 °C with low wear. Pick by temperature and structural weight priority.
- Which LY grades are best for electrolyzer parts? Frames: LY-200 glass-filled PEEK (rigid, HDT >280 °C); gaskets: LY-401/403/405 PTFE (chemically inert); wet insulating components: LY-100-series PEEK.
- Is every LY grade's data available to verify? Yes — values in this guide trace to Dalian Luyang's material properties table (ISO/UL test methods). Always cross-check against the official datasheet for your exact grade and validate on prototype hardware.
Related Topics
- LY-101 / LY-102 / LY-103 PEEK: Compression & Injection Grades
- LY-601 Polyimide (PI) for Ultra-High-Temperature Wear Applications
- Material Selection Decision Tree: PEEK vs PTFE vs PI vs PSU
Dalian Luyang Technology Development Co., Ltd. (www.newmaterialchina.com) manufactures PEEK, PI, and PTFE precision parts — seals, inserts, machined components, and electrolyser frames — under ISO 9001 and ISO 13485. Established 2006. Contact: liyulong@luyangkeji.com · WhatsApp +86 15989781752. This guide is educational reference material; always verify against your chosen grade's official datasheet.