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Wiper 30x38x5/7 A208 PU

CodeA208-030 PU
In stock122pcs
Priceexcl. VATFrom PLN 8.05/pcs
Wiper 30x38x5/7 A208 PU—
PLN 8.05excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeA208
Material typePU
BrandALP
Weight5g
Wipers dimension
Inside diameter d30mm
Outside diameter D38mm
Width h5mm
Width H7mm

Documents

Description

The wiper ring 30x38x5/7 A208 PU is a sealing element used in hydraulics and pneumatics, fitted on the piston rod of cylinders. Its task is to protect the system against external contaminants – dust, mud, moisture or dirt – that could get inside the system. Made of polyurethane (PU), designed for work in typical industrial applications. Technical parameters: Inner diameter (d): 30 mm Outer diameter (D): 38 mm Height (H): 5/7 mm Size in inches: 1.18x1.50x0.20/0.28" Material: PU (polyurethane)

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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