The Caterpillar-specific nylon step-cut 2-piece piston seal also known as the ChemCast seal, and is a bi-directional piston seal designed for heavy duty applications. This seal consists of a self lubricated, glass reinforced, heat
stabilized, thermoplastic O.D. sealing ring that is energized by a flexible, oval shape, energizer.
When installed in the bore, the precision step cut ring is aligned and compressed to provide drift free operation. The hard thermoplastic cap allows this profile to work effectively in substandard, rough-surfaced cylinders with much lower tolerances. This seal is an excellent choice for mobile equipment experiencing shock loads. This profile can pass over ports, resist cold flow and protect against metal-to-metal contact.
Material Type (Primary Seal): GLASS-FILLED NYLON
Material Type (Energizer): 80A NITRILE
Rockwell Hardness (M) 77
Rockwell Hardness ( R) 114
Temperature Range (F): -30 TO 220
Max Pressure (psi) WITHOUT WEAR RINGS: 7250
Extrusion Gap at Various Pressures (in):
• 7,250 PSI: 0.032
Max Speed (ft/sec): 3.2
Mating Surface Roughness – Ra (µin) – DYNAMIC: 3<>12
Mating Surface Roughness – Ra (µin) – STATIC: 32 MAX
Part Number Definition (Inch): CTC-(CAT PART NUMBER)