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The AD48 is a double-acting wiper for mobile hydraulics. The protruding wiper lip removes dirt and other contaminants from the piston rod as it retracts into the cylinder. In this way, the profile helps prevent contamination from the outside from entering the installation space.
A second lip reduces the residual oil film on the piston rod. The AD48 therefore combines the removal of dirt with the reduction of residual oil. The profile is made entirely of TPU, does not contain a metal angle ring and is particularly suitable for applications involving heavy contamination.
The AD48 is made of TPU and has a protruding wiper lip with a second lip on the opposite side of the profile. The outer wiper lip removes contaminants during the retraction movement of the piston rod. The second lip reduces the residual oil film on the rod surface.
No metal angle ring is present. The AD48 is installed in an axially semi-closed installation space. According to the datasheet, the profile design provides good wiping properties, high wear resistance and a long service life.
As the piston rod retracts, the protruding wiper lip removes dirt from the rod surface. The second lip is intended to reduce the residual oil film. This combination is why the AD48 is described in the datasheet as a double-acting wiper.
A pressure relief hole is recommended for returning the residual oil. This recommendation must be considered when designing the installation space. The datasheet does not specify dimensions for this hole, so its design must be matched to the corresponding construction data.
The AD48 is intended for mobile hydraulics and is particularly suitable for applications involving heavy contamination. The profile also has a broad application spectrum for moderately demanding applications in general industry.
The reliable profile design is combined with a good price-performance ratio. The AD48 is manufactured by certified external suppliers. During selection, it must be verified that the double-lip function and axially semi-closed installation space are suitable for the application.
The AD48 double wiper is specified exclusively with TPU as its material. During selection, the temperature range, sliding speed and medium with which the profile comes into contact must be assessed together. The AD48 has a temperature range of -30 to +100 °C and a sliding speed of up to 1 m/s.
The AD48 is resistant to hydraulic oils according to DIN 51524 parts 1 to 3, lubricating oils and lubricating greases based on mineral oils. The profile can also be used with the flame-retardant hydraulic fluids HFA, HFB and HFC according to VCMA 24317.
The permissible operating temperature for the AD48 is between -30 and +100 °C. The maximum sliding speed is 1 m/s. These figures are maximum limits and, according to the datasheet, may not all be reached at the same time.
The temperature and sliding speed must therefore not be assessed separately from the medium and other operating conditions. The dimensions, axially semi-closed installation space and surfaces of the piston rod and groove must also be suitable for the profile.
Current information about approvals and certificates must be checked in the material data sheet applicable to the respective material. This information depends on the specific compound and, according to the datasheet, cannot be listed exhaustively in the general product information.
The cylinder housing and piston rod or piston must be chamfered to prevent damage during installation. The length and angle of these installation chamfers must correspond to the associated installation-space drawing.
The surface roughness of the piston rod must comply with the specifications of the seal used. The groove flanks for the AD48 may have a maximum surface roughness of Ra 4 µm. A maximum surface roughness of Ra 2.5 µm applies to the groove base.
The AD48 is installed in an axially semi-closed installation space. Sharp edges must be deburred beforehand. Seamless chamfers and radii must also be provided so that the TPU profile is not damaged during installation.
Carefully clean the installation space before inserting the wiper. Dust, dirt, metal chips and other contaminants must be completely removed. Grease the mounting surfaces and the wiper before installing the profile.
The AD48 must be stored at a temperature below 25 °C. During storage, the wiper must not be exposed to direct heat sources or direct sunlight. Condensation in the storage room must also be prevented.
The product must also be protected against ozone and ionising radiation. The storage recommendations in the datasheet are based on the revision of ISO 2230 dated 16 September 1992.
When selecting an AD48, first check the required dimensions and the geometry of the axially semi-closed installation space. Then assess whether TPU is suitable for the medium and whether the temperature range of -30 to +100 °C and maximum sliding speed of 1 m/s match the operating conditions.
Also consider the contamination present, the outer wiping lip, the second lip for reducing the residual oil film and the recommended pressure relief hole for returning residual oil. The installation chamfers and surface roughness of the groove flanks, groove base and piston rod must also be checked. If an approval or certification is required, it must be established separately for the selected compound.
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