Elastomeric seals are flexible components used to prevent fluid or gas leakage between mating surfaces. They are widely used in industries such as automotive, aerospace, oil & gas, and manufacturing due to their resilience, chemical resistance, and ability to withstand extreme temperatures and pressures.
| Type | Description | Applications |
|---|---|---|
| O-Rings | Circular cross-section, sit in grooves | Hydraulic systems, pumps, valves |
| Gaskets | Flat seals between flanges | Pipe joints, engines, compressors |
| D-Rings | D-shaped cross-section | Low-pressure static sealing |
| Square Rings | Rectangular cross-section | High-pressure hydraulic systems |
| Type | Description | Applications |
|---|---|---|
| Rotary Shaft Seals | Prevent leakage along rotating shafts | Pumps, motors, gearboxes |
| Reciprocating Seals | For linear motion systems | Hydraulic cylinders, pistons |
| Lip Seals | Flexible lip contacts moving part | Automotive wheel bearings, transmissions |
| U-Cups | U-shaped for pistons & rods | Hydraulic and pneumatic cylinders |
| Component | Common Materials | Key Properties | Applications |
|---|---|---|---|
| Primary Sealing Faces | Silicon Carbide (SiC), Tungsten Carbide (WC), Carbon Graphite | High wear resistance, thermal stability | High-speed pumps, abrasive fluids |
| Secondary Seals (O-rings, gaskets) | Nitrile (NBR), FKM (Viton®), PTFE (Teflon®) | Chemical resistance, flexibility | Chemical processing, food-grade seals |
| Metal Parts (Springs, Housings) | Stainless Steel (SS 316), Hastelloy, Titanium | Corrosion resistance, strength | Offshore, marine, acidic environments |
| Bellows | PTFE, FKM, Metal (Inconel) | Flexibility, thermal cycling resistance | High-temp/pressure systems |
| Material | Temperature Range | Chemical Resistance | Key Features | Common Applications |
|---|---|---|---|---|
| Nitrile (NBR) | -40°C to +120°C | Good for oils, fuels | Cost-effective, durable | Automotive fuel systems, hydraulic seals |
| Fluoroelastomer (FKM/Viton®) | -20°C to +200°C | Excellent for fuels, acids | High heat resistance | Aerospace, chemical processing |
| Silicone (VMQ) | -60°C to +230°C | Moderate chemical resistance | Flexible, biocompatible | Medical, food-grade applications |
| Ethylene Propylene (EPDM) | -50°C to +150°C | Resistant to water, steam | Weather-resistant | Outdoor seals, HVAC systems |
| Polyurethane (AU/EU) | -40°C to +80°C | Good abrasion resistance | High wear resistance | Hydraulic seals, industrial machinery |
| PTFE (Teflon®) | -200°C to +260°C | Exceptional chemical resistance | Low friction, non-stick | Chemical processing, high-purity seals |
| AS568 Size | Inner Diameter (mm) | Cross-Section (mm) | Common Applications |
|---|---|---|---|
| 001 | 1.78 | 1.78 | Small pneumatic systems |
| 010 | 6.07 | 1.78 | Hydraulic fittings |
| 112 | 19.63 | 2.62 | Automotive fuel systems |
| 320 | 74.63 | 3.53 | Industrial pumps |
| 430 | 139.73 | 5.33 | Large hydraulic cylinders |
| Issue | Possible Cause | Solution |
|---|---|---|
| Extrusion | High pressure, incorrect hardness | Use harder material (e.g., 90 Shore A) |
| Swelling | Chemical incompatibility | Switch to FKM or PTFE |
| Cracking | Ozone/UV exposure | Use EPDM or ozone-resistant material |
| Abrasion | Rough surfaces, misalignment | Polish mating surfaces, use polyurethane |
| Compression Set | Over-compression, high temperature | Use high-temperature material (FKM) |
