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Rod-Piston seal K21 18x30x6

CodeK21-018/1 PU
AvailabilityOn request
Rod-Piston seal K21 18x30x6—
€2.03excl. VAT

Technical data

Properties
Seal typeK21
Material typePU
BrandKastas
Weight5g
Hydraulic seals dimension
Rod diameter d18mm
Groove Diameter D30mm
Seal width h6mm

Documents

Description

K21, RPS - single-acting symmetrical hydraulic seals. The presence of the same size and shape of the sealing lips allows the use of these seals to seal both the Rod and the Piston. They are made of the following materials: PU (polyurethane) and NBR (nitrile rubber). You will find the basic requirements and operating conditions of the cuff in the description for each type and size. Use the FILTER of diameters for selection of the necessary size. ADVANTAGES: Wide range of sizes Easy installation in closed grooves Simple groove design Cost-effective repair seal

Material

PU / TPU / H-PU (polyurethane)

  • Standard PU / TPU-30 °C to +80 °C

Best for high pressure and abrasion, in mineral hydraulic oil. Standard PU must never meet hot water, steam or brake fluid, or run hotter than +90 °C.

Chemical resistance
Can be usedDo not use
Extreme pressure and pulsation (up to 40-50 MPa, very resistant to extrusion into the gap)Hot water and steam with standard PU: hydrolysis, it breaks down into powder
Abrasion, friction, cutting and tearing (4-5 times tougher than NBR)Glycol brake fluid (DOT 3, DOT 4, DOT 5.1): swells quickly
Mineral hydraulic oil (HL, HLP) and greaseHigh temperatures above +90 to +100 °C with standard TPU: it softens
Fuel oil, diesel and technical oils (aliphatic hydrocarbons)Strong (concentrated) acids and alkalis: sulfuric, nitric, caustic soda
Ozone, weather and sunlight (does not crack from weather)Acetone, MEK, toluene, benzene, dichloromethane (polar and aromatic solvents)
Water-based fire-resistant fluids HFA, HFB (only special H-PU)Synthetic ester oils and fire-resistant fluid HFD-R
Dry compressed air and technical gasesStrong alcohols (methanol, ethanol): swelling

Water and heat destroy standard PU: above +50 to +60 °C in water or damp oil it turns into a sticky paste or crumbles. If the system contains water or an emulsion, use only H-PU (hydrolysis-resistant).

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