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Pneumatic seal 25x33x7,8/6,3 A855 PU

CodeA855-025 PU
In stock66pcs
Priceexcl. VATFrom PLN 8.05/pcs
Pneumatic seal 25x33x7,8/6,3 A855 PU—
PLN 8.05excl. VAT

Price by quantityexcl. VAT

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Technical data

Properties
Seal typeA855
Material typePU
BrandALP
Weight3g
Pneumatic seals dimension
Rod diameter d25mm
Bore Diameter D33mm
Width 16,3mm
Width 27,8mm

Documents

Description

Pneumatic ring 25x33x7,8/6,3 A855 PU is a cushioning seal for pneumatic cylinders. Made of polyurethane (PU), it is used in pneumatic systems to control and damp the end of the piston's stroke. Technical data: Inner diameter (d): 25 mm Outer diameter (D): 33 mm Total height (B): 7,8 mm Working height (C): 6,3 mm Material: PU (polyurethane) Maximum sliding speed: 1,0 m/s In inches: 25x33x7,8/6,3 ≈ 0.98x1.30x0.31/0.25"

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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