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Home > Product > Ferrule Fittings > Technical Resources > Material Selection Guide
Selecting the right material for your ferrule tube fittings is crucial to ensure corrosion resistance, leak-proof performance, regulatory compliance, and long service life. At Perfect Engineers, our brand PE-LOCK offers ferrule fittings in a wide range of materials to meet the diverse needs of chemical, oil & gas, pharmaceutical, marine, power, food, and semiconductor industries.
This guide helps you choose the best-fitting material based on your application media, environment, temperature, and global standards.
Choosing the wrong material can result in:
| Material | Best For | Max Temp | Pressure Rating (approx) | Corrosion Resistance |
|---|---|---|---|---|
| SS316/316L | General industrial, pharma, food, water, oxygen | 600°C | Up to 6,000 PSI | High |
| SS321 | Steam, high-temp gas, power plants | 850°C | Up to 6,000 PSI | Medium-High |
| Duplex SS | Chlorides, marine, offshore platforms | 300°C | Up to 9,000 PSI | Excellent |
| Super Duplex | Aggressive seawater, offshore structures | 300°C | Up to 10,000 PSI | Excellent |
| Monel 400 | Seawater, sulfuric acid, hydrofluoric acid | 450°C | Up to 6,000 PSI | Excellent |
| Inconel 625/718 | High-temp hydrogen, rocket fuels, chemical gas | 1000°C | Up to 10,000 PSI | Outstanding |
| Hastelloy C276 | Highly corrosive acids, oxidizers, chlorides | 400°C | Up to 9,000 PSI | Outstanding |
| Titanium Gr.2/5 | Biocompatible systems, seawater, chloride, clean gases | 400°C | Up to 8,000 PSI | Excellent |
| Brass | Low-pressure air, water, inert gases (non-oxygen) | 200°C | Up to 3,000 PSI | Moderate |
| PTFE-Coated SS | Sticky, reactive media like chlorine, slurry, adhesives | 250°C | Up to 5,000 PSI | Excellent (chemical) |
| Alloy 20 | Sulfuric acid, food, pharma solvents | 300°C | Up to 6,000 PSI | Very High |
| Application/Industry | Recommended Materials |
|---|---|
| Oil & Gas (sour service) | Inconel, Monel, Hastelloy, Super Duplex |
| Chemical Process (acids/solvents) | Hastelloy C276, Alloy 20, PTFE-coated SS |
| Marine / Offshore | Super Duplex, Monel, Titanium |
| Pharmaceutical / Biotech | SS316L (EP finish), Titanium, PTFE-Coated SS |
| Food & Beverage | SS316L, Alloy 20 (optional EP) |
| Semiconductor / UHP Gases | SS316L (low-sulfur), Electropolished, Nickel |
| Power Generation (steam/condensate) | SS321, Inconel, Duplex |
| Aerospace / Cryogenic Systems | Inconel, Titanium, Monel |
| Medical Gas Lines | SS316L (oxygen-clean), Brass (non-O₂ only) |
Always adjust pressure rating based on material temperature limits. Refer to:
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| Chemical | Recommended Materials |
|---|---|
| Sulfuric Acid | Hastelloy, Alloy 20, PTFE-Coated SS |
| Seawater | Super Duplex, Titanium, Monel |
| Nitric Acid | Titanium, Inconel, Hastelloy |
| Hydrochloric Acid | Hastelloy, PTFE-Coated SS |
| Hydrogen Fluoride | Monel, PTFE-Coated SS |
| Steam | SS321, Inconel, Duplex |
| Cleanroom N₂ / O₂ | SS316L EP, Titanium, Nickel |
Use Monel, Super Duplex, or Titanium to resist pitting and chloride attack.
Not recommended. Use SS316L oxygen-cleaned fittings to avoid flammability risks.
Inconel 625/718 is ideal for up to 1000°C and high-pressure fluid or gas applications.
Yes. All materials are dimensionally identical and fully interchangeable across PE-LOCK configurations.