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Wiper A208 31,5x39,5x5/6,5 PU

CodeA208-031 PU
In stock457pcs
Priceexcl. VATFrom €2.40/pcs
Wiper A208 31,5x39,5x5/6,5 PU—
€2.40excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeA208
Material typePU
BrandALP
Weight5g
Wipers dimension
Inside diameter d31,5mm
Outside diameter D39,5mm
Width h5mm
Width H6,5mm

Documents

Description

The wiper ring 31,5x39,5x5/6,5 A208 PU is a sealing element fitted in the gland of hydraulic and pneumatic cylinders. Its task is to remove contaminants such as dust, mud or moisture from the piston rod surface and prevent them from getting inside the system. Made of polyurethane (PU), used in a variety of industrial applications – also commonly found in warehouse trucks (pallet trucks). Technical parameters: Inner diameter (d): 31,5 mm Outer diameter (D): 39,5 mm Height (H): 5/6,5 mm Size in inches: 1.24x1.56x0.20/0.26" 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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