About Hallite
Hallite Hydraulic & Pneumatic Sealing Solutions
Hallite Seals International has over 100 years of heritage in fluid power sealing, manufacturing hydraulic rod seals, piston seals, cushion seals, and pneumatic dynamic seals for industrial cylinders, motors, and systems worldwide. Hallite's engineering focuses on elastomer chemistry—proprietary polyurethane compounds (Hythane® 181, Hallprene® rubber-fabric composites) optimized for low friction, wide temperature range, and compatibility with mineral oils, synthetics, water-glycol, and biodegradable fluids.
The core seal portfolio includes the Hallite 601 (general-purpose high-performance rod/piston seal in Hythane polyurethane, single-acting, low-temperature operation to −40°C), the Hallite 605 (improved low-temperature rod seal for pneumatics), the Hallite 607/608/609 series (piston and rod seals for pneumatic applications), the Hallite 661 (cushion seal for shock absorption at cylinder end), and combined wiper seals (851/853) that integrate a rod/piston seal with a wiper to exclude dust and contamination. All seals are available in both ISO metric (bore sizes 12–400 mm, rod sizes 8–250 mm) and inch-unit specifications.
Hallite seals are engineered for single-acting (one-direction pressure) and double-acting (bidirectional pressure) cylinders across pressure ranges 0–280 bar (4000 psi) for standard duty and up to 350 bar (5000 psi) for heavy-duty applications. The Hythane polyurethane material exhibits minimal friction and swell, reducing parasitic drag on cylinder rods and extending pump/motor life. Elastomer composition varies by application: NBR (nitrile) for cost-sensitive commodity work, FKM (Viton/Fluorocarbon) for high-temperature or chemical-resistant duty.
Industries relying on Hallite seals include mobile hydraulics (construction equipment, agriculture, forestry), industrial automation (assembly lines, packaging), marine and offshore (subsea cylinders, platform lifts), mining (heavy-duty rams for digging and hauling), aerospace (flight-control actuators), and food processing (washdown-resistant seals). Hallite's mining-specific designs include reinforced polyurethane shells with polyacetal anti-extrusion rings for rod seals operating in abrasive slurry environments.
ChatMRO streamlines sourcing Hallite seals by matching your cylinder bore, rod diameter, pressure, and fluid type to the exact seal model and material. Describe your hydraulic or pneumatic equipment (excavator, punch press, pneumatic nailer)—ChatMRO delivers verified Hallite seal kits and cross-references in seconds, along with installation guidance and lead times.
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Frequently asked questions
What's the difference between a Hallite rod seal and a piston seal?
A rod seal (e.g., 601, 605) seals against a moving external rod that extends/retracts from a cylinder, preventing oil leakage around the rod. A piston seal (e.g., 607, 608) seals between the piston and bore inside the cylinder, preventing high-pressure fluid from bypassing to the return line. Most cylinders need both: a piston seal for pressure hold and a rod wiper/seal for contamination exclusion and leakage prevention.
Which Hallite seal material should I choose for my application—polyurethane, NBR, or FKM?
Hythane polyurethane (Hallite 601, 605) is the premium choice for most hydraulics and pneumatics—low friction, wide temperature (−40 to +100°C), and compatibility with all standard fluids. NBR (nitrile rubber) is lower-cost but has narrower temperature range and slower response; use only for commodity applications with limited temperature variation. FKM (Viton) is needed when sealing high-temperature fluids (hydraulic fluid >80°C) or aggressive chemicals (ester-based hydraulics, chlorinated solvents).
Can I use a Hallite seal designed for hydraulics in a pneumatic cylinder?
Most Hallite seals are dual-rated for both hydraulic and pneumatic service, but operating conditions differ: pneumatics typically run 6–8 bar (low pressure, no heat generation), while hydraulics run 200+ bar (high friction, heat). A hydraulic-duty seal will overwork in pneumatics (slower response, stiction). Always consult the Hallite technical data sheet—pneumatic-specific seals (605, 607) are optimized for low-friction, tight sealing at low pressure and should be preferred for pneumatic cylinders.
What's the maximum pressure and temperature range for Hallite Hythane seals?
Hallite Hythane polyurethane seals are rated 0–280 bar (4000 psi) for continuous duty and up to 350 bar (5000 psi) for intermittent or pilot-operated service. Temperature range is −40 to +100°C for standard Hythane; specialized high-temperature formulations exist for +120°C continuous operation in thermal-oil or food-processing duty. Always verify pressure and temperature against the specific seal model datasheet.
How do I choose between a combined rod wiper-seal (851/853) and separate seals?
Combined seals (Hallite 851, 853) integrate a primary rod seal with an external wiper ring in one unit, reducing parts count and assembly time. They're ideal for new equipment or OEM applications where rod and bore quality are assured. Separate seals are better for retrofit or repair where bore wear or contamination risk is high—the wiper can be sized independently to exclude more debris. Both approaches are valid; check your cylinder bore condition and environment before choosing.