Hydraulic Seal
Simply add to hydraulic fluid. No disassembly required - restores seals and O-rings to stop oil leaks from the inside.
Just Pour to Seal Hydraulic Oil Leaks
RISLONE Hydraulic Seal is a hydraulic fluid leak stop additive developed by Rislone in the United States. Simply pour into the hydraulic tank and circulate to penetrate seals and O-rings that have hardened and shrunk due to aging, restoring their flexibility and elasticity. It also forms a polymer oil film on microscopic scratches on metal sliding surfaces to seal leak paths.
No disassembly of cylinders or pumps is required. Since the equipment can be treated while operating, downtime is minimized, and the high costs of parts, labor, and lost production associated with seal replacement are significantly reduced.
How It Works
Simply add to hydraulic fluid and circulate. Three actions stop the leak.
Seal Restoration
Penetrates rubber seals and O-rings that have hardened and shrunk due to aging. Restores polymer flexibility and elasticity, recovering sealing performance.
Oil Film Formation
Forms a polymer oil film on microscopic scratches on metal sliding surfaces. Seals leak paths and also reduces metal-to-metal friction and wear.
Cleaning & Protection
Removes harmful deposits such as sludge and varnish caused by fluid oxidation. Keeps the entire system clean and maintains performance.
Comparison with Conventional Methods
| Comparison Item | Hydraulic Seal | Seal Replacement (Conventional) |
|---|---|---|
| Equipment Disassembly | Not Required | Required (cylinder disassembly) |
| Equipment Shutdown | Not Required (treat while operating) | Required (hours to days) |
| Work Time | Pour + circulate approx. 30 min | Half day to several days |
| Required Expertise | Just pour (no special skills needed) | Hydraulic equipment expertise required |
| Cost | Additive cost only | Parts + labor + downtime losses |
| Secondary Benefits | Fluid cleaning & wear reduction | None |
Product Lineup
Two volumes available to match your equipment size.
Dosage Guide
For preventive addition during regular changes
For mild to moderate leaks
For long-neglected leaks
Product Specifications
- Product NameRISLONE Hydraulic Seal
- Part NumberRP-41820 (950mL) / RP-61821 (3.8L)
- TypeHydraulic fluid leak stop additive
- Compatible FluidsMineral oil, synthetic oil (ISO VG 32/46/68)
- Dosage (Preventive)15mL/L (1.5%)
- Dosage (Standard)30mL/L (3%)
- Dosage (Enhanced)60mL/L (6%)
- Applicable ComponentsPump seals, control valve seals, actuators, rams, cylinders, O-ring boss fittings, hydrostatic transmissions
- Time to EffectHours to days after circulation
- Usage RestrictionsNot for brake hydraulics or power steering
- SafetyNo adverse effects on hoses or painted surfaces
- ManufacturerRislone (USA, near Detroit, Michigan)
- Japan SalesAirMore Co., Ltd. (authorized dealer)
Applications
Manufacturing Lines & Industrial Machinery
Treat hydraulic cylinder leaks on injection molding machines, presses, and machine tools while they continue operating. Avoid production stoppages.
Construction & Civil Engineering Equipment
For hydraulic leaks on excavators, wheel loaders, and dump trucks. Respond immediately on-site to minimize work interruptions.
Agricultural & Forestry Machinery
For hydraulic systems on tractors, combines, and more. Reduce the risk of losses from breakdowns during busy seasons and support stable operation.
Logistics & Port Facilities
For forklifts, table lifts, and cargo handling equipment. Ideal for batch maintenance at facilities with large equipment fleets.
Hydraulic Seal Case Studies
Hydraulic Cylinder Repeat Order
Sealed oil leak from a 32 MPa high-pressure cylinder. Resolved without cylinder replacement.
An oil leak occurred on an injection molding machine hydraulic cylinder (32 MPa). By adding Hydraulic Seal, the leak was stopped without replacing the cylinder. The satisfied customer has since placed repeat orders.
Hydraulic Cylinder All Units Sealed
30 units running for 20 years without maintenance - all cylinder leaks stopped.
Oil leaks had developed on all cylinders of 30 table lifts that had been operating for 20 years without maintenance. By adding Hydraulic Seal, all leaks were sealed, avoiding a large-scale equipment replacement.
Horizontal Hydraulic Cylinder Sealed Without Teardown
A 20-year-old shearing machine — horizontal cylinder leak stopped with no disassembly.
A shearing machine (Aizawa Tekkosho ADH625) in service for about 20 years developed an oil leak from its horizontal hydraulic cylinder. With a non-standard oil seal costing 100,000 yen or more to replace, Hydraulic Seal was simply added to the oil and stopped the leak with no teardown.
Frequently Asked Questions
When added to and circulated through hydraulic oil, it penetrates seals and O-rings that have hardened or shrunk due to aging, restoring flexibility and elasticity. Furthermore, it forms a polymer oil film on minute scratches on metal surfaces, sealing leak paths.
Yes. Simply pour it into the hydraulic oil tank and run the equipment normally (circulate for about 30 minutes). Disassembly of cylinders or pumps is not required, and the equipment can be processed while in operation.
No. Hydraulic Seal is exclusively for hydraulic oil. It cannot be used with brake fluid or power steering fluid.
In many cases, the effect can be confirmed within a few hours of circulation after addition. Depending on the severity of the leak, it may take several days.
It is effective for seepage to mild leaks caused by deterioration of seals and O-rings. For severe leaks caused by physical damage to the seal or large cracks, seal replacement may be necessary.
Want to Learn More About Hydraulic Seal?
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