Equipment operating in harsh outdoor conditions may face severe weather, extreme temperature changes, mud or heavy debris, or aggressive chemical exposure. Choosing the right seals for harsh environments requires a clear understanding of your operational stressors. In this guide, learn more about contamination defense, extreme temperature resistance, and how to choose custom sealing profiles for your application.
Defining “Harsh” for Your Application
Before reviewing material specifications, engineering teams must look at the specific challenges and environmental threats targeting their assemblies. A seal that survives high pressure indoors, for instance, might fail when exposed to outdoor UV light or abrasive mud. Identifying the primary failure modes helps narrow down the correct seal geometry and compound.
Temperature, Chemicals, and Contamination
When exploring how to choose seals for harsh environments, start by isolating the most destructive operational variables:
- Thermal extremes. Equipment engines and hydraulic systems can generate intense heat, and field operations can introduce freezing conditions in the winter.
- Chemical exposure. Agricultural seals may have regular contact with harsh fertilizers, pesticides, and petroleum-based fuels. Aggressive fluids can cause some materials to swell, degrade, or lose their elastic memory.
- Contamination and abrasives. Earthmoving machinery operates in environments with dust, silica, and thick mud. Abrasive particles can grind down standard rubber lips and score metal shafts.
- System pressure. High-pressure hydraulic cylinders demand components that resist extrusion. Fluctuating pressure spikes can force the seal material into hardware gaps and lead to sudden mechanical failures.
Materials Built for Harsh Conditions
Selecting a resilient compound can be critical to preventing premature degradation and wear in harsh operating conditions. Sealing components can be manufactured from robust elastomers, plastics, and metals tailored to your exact application, such as:
- Fluorocarbon (FKM). This elastomer withstands extreme temperatures and resists petroleum-based fluids, halogenated hydrocarbons and acids.
- Polytetrafluoroethylene (PTFE). PTFE delivers exceptional chemical resistance and operates with low friction in dry-running scenarios.
- HNBR. This rubber material offers high durability and flexibility in low-temperature environments, making it suitable for applications in cold or extremely low temperatures.
- Polyurethane (PU). This material exhibits high toughness and abrasion resistance. This makes it suitable for applications that involve exposure to abrasive dirt and gravel.
- Ethylene Propylene Diene Monomer (EPDM). This synthetic rubber can survive outdoor weather exposure, UV light, and agricultural chemicals.
Design Considerations for Extreme Environments
Engineering seals for extreme environments can involve addressing unique design considerations. For example, a flooded ATV axle or a deep-trench excavator requires sealing that keeps grease contained inside the joint while blocking external water. Design engineers can collaborate with sealing experts to obtain engineered molded seals that fit unique housing geometries. Depending on the application, spring-loaded sealing lips and secondary wiper components can protect from abrasive conditions and stop heavy debris, dirt, and other contaminants from bypassing the primary sealing barrier.
Seals for Harsh Environments with MSP Seals
MSP Seals delivers reliable sealing solutions that improve durability and can prevent sudden equipment failures in the field. Since 1998, we have supported design engineers by supplying rotary, shaft, and molded seals. We are able to accommodate the unique sealing challenges of demanding industries, including agriculture, construction, heavy truck, and more. Our facility is certified to follow the ISO 9001 standards, and our team can help verify material compatibility and how to best meet your specific performance requirements.
Get help specifying a seal for your application today.
