Stator elastomer and rotor material selection for different media.
The elastomer and alloy must resist swelling, cracking and degradation from the pumped fluid — acids, alkalis, oils, solvents.
Slurries and solids wear softer elastomers faster. Balance sealing performance against wear life.
Elastomers lose elasticity at high temperature and harden at low temperature — match the continuous service temperature.
The stator must hold seal integrity under cyclic rotor compression without permanent deformation.
Food & pharma require FDA-grade elastomers; oil & gas and mining may require industry certifications.
| Material | Key Properties | Best For | Limitations |
|---|---|---|---|
| NBR (Nitrile) | Good oil/fuel resistance, cost-effective | Oils, fuels, water, light slurries | Weak against strong acids, solvents, ozone |
| EPDM (Ethylene-Propylene) | Excellent water & chemical resistance | Water, steam, acids, alkalis, food media | Not suitable for oils and fuels |
| FKM (Fluoroelastomer / Viton) | High temperature & chemical resistance | High temperature (up to 200 °C), aggressive chemicals | Higher cost |
| HNBR (Hydrogenated Nitrile) | Extreme wear & aging resistance | High-wear, high oil-temperature duties | Higher cost |
| Material | Key Properties | Best For |
|---|---|---|
| SS304 | Standard corrosion resistance | General-purpose water and mild chemicals |
| SS316L | Higher corrosion resistance | Food, pharma, chloride-bearing media |
| Duplex Stainless | High strength + corrosion resistance | Aggressive chemicals, high pressure |
| Chrome-Plated Alloy Steel | Hardened wear surface | Abrasive slurries, high wear |
| Tungsten-Carbide Coated | Maximum wear resistance | Extreme abrasive and high-wear duties |
Zero-leakage sealing for high pressure, toxic or volatile media. Single or double face.
Economic sealing for low-pressure service — easy to adjust and replace.
| Media | Stator | Rotor |
|---|---|---|
| Oils & Fuels | NBR | SS304 / SS316L |
| Water & Chemicals | EPDM | SS316L / Duplex |
| High Temperature / Aggressive | FKM | Duplex / Alloy |
| Abrasive Slurries & High Wear | HNBR | Chrome-Plated / WC-Coated |
| Food & Pharmaceutical | Food-Grade EPDM | SS316L |
