POLYPACK METRIC

DESCRIPTION

The MUH-B style metric polypack is manufactured by SKF/Polyseal and is pre-loaded with a Nitrile quad-ring giving positive lip contact at low pressure and vacuum conditions. This seal provides positive lip sealing at all pressures, longer life of the seal due to Nitrile’s lower compression set compared to urethane, and stability to the lips resisting collapse under severe load changes and high cycle rates. 

The shell is molded in Lubrithane, ensuring flexibility for installation and high/low pressure performance. 

The MUH-B typically includes an o-ring or quad-ring energizer. 

SEAL INFORMATION

Material Type (Primary Seal): POLYURETHANE 

Material Type (Energizer): 70A NITRILE 

Durometer (Shore A): 95 

Temperature Range (F): -40 TO 230 

Max Pressure (psi): 5000 

Extrusion Gap at Various Pressures (mm):

• 4,500 PSI: 0.50
• 5,000 PSI: 0.40

Max Speed (ft/sec): 3.0 

Mating Surface Roughness - Ra (µm) - DYNAMIC: 0.1<>0.4 

Mating Surface Roughness - Ra (µm) - STATIC: 1.6 MAX 

Part Number Definition (Metric): MUH-(ID)X(OD)X(HT)B 

Additional Part Number Definition (Metric): 40 X 50 X 6 = MUH-40X50X6B