TOSC focuses on polyurethane sealing systems. Beyond hydraulic breakers and excavators, we are extending into wind energy, oil field and mining equipment.
TOSC specializes in oil seals for hydraulic breakers/hammers. We supply regular MDI (P6000) and premium self-developed PPDI compounds — verified by most breaker brands to outperform standard materials, especially on large breakers.
High resilience and wear resistance for高频, high-temperature breaker duty.
Soosan, Furukawa, Atlas Copco, Krupp, Daemo, Doosan, Toku, Montabert.
Complete sealing for the whole excavator: Boom, Arm, Bucket, Hydraulic Pump, Control Valve, Center Joint, Travel Motor, Swing Motor, Track Adjuster and Pilot Valve — individual seals or full kits, with customization.
Covering every sealed point of the excavator hydraulic system.
Individual components and made-to-sample seals available.
TOSC's PPDI polyurethane offers excellent resilience, wear and fatigue resistance with low heat build-up — performing in high-frequency, high/low-temperature (-30~130°C) conditions beyond ordinary PU, ideal for wind turbine pitch and yaw systems.
PUAR — a self-developed polymer replacing traditional PTFE+Cu step seals — delivers twice the service life with superior tear and wear resistance, validated for demanding oil-field sealing conditions.
Rock breakers in open-pit mines and quarries run under relentless impact and abrasive dust. TOSC PPDI main seals and full kits resist extrusion and wear, keeping production uninterrupted.
Urban demolition and recycling demand reliable, leak-free breakers shift after shift. TOSC seal kits are built for high-cycle duty and fast on-site changeover.
From earthworks to road building, excavators and breakers power infrastructure projects worldwide. TOSC keeps your hydraulic system sealed through every season.
Our application engineers help you select the right compound and kit for your equipment and duty cycle.