Advantages of Vesconite -
Classification Society Approvals -
Field Trials of Vesconite Stern Tube Bushes -
VESCONITE is a specialised thermoplastic made from internally lubricated polymers. Proven since the 1960s, Vesconite
is an exceptional plain bearing material. It gives long life in applications where only the lowest wear rates can be
allowed, even when the application is poorly lubricated and dirty.
Vesconite is ideal for many marine applications. It is suited to both dry and immersed applications - in fact water
is an excellent lubricant.
Vesconite is extensively used for rudder and stern tube bearings. Vesconite's internal lubricants make it eminently
suited to upper rudder bearing applications where there are long periods between greasing or no greasing at all, or
where water lubrication cannot be ensured when operating with light ballasts.
The hundreds of vessels equipped with Vesconite during the last 15 years - ranging from pleasure boats to tankers -
testify to the desirability of long life, low maintenance Vesconite in marine applications.
In stern tube and rudder bushes, Vesconite has many advantages compared to elastomers, phenolic laminates, phosphor
bronze and lignum vitae. Vesconite combines many of the advantages of metallic and non-metallic bearings and bushes.
It has a design load limit higher than for white metal. Vesconite gives up to 10 times the service life of phosphor
bronze in poorly lubricated conditions.
Vesconite has a much lower friction and better wear resistance than most laminates, elastomers and nylons. In rudder
applications, the low static and dynamic coefficients of friction of Vesconite mean lower power requirements for the
Vesconite has negligible water absorption characteristics unlike nylon, certain elastomer and phenolic laminate
products. Vesconite does not delaminate.
Vesconite does not contain asbestos or other fibres. It is easy and safe to machine on standard metalworking and
woodworking machinery. Vesconite bushes are easily installed and removed.
Vesconite is resistant to acids, solvents, hydrocarbons, oils and fuels. It is not susceptible to electrolytic
corrosion. In addition to the low wear rate experienced by Vesconite bushes, users report greatly reduced wear rates
on metal journal surfaces such as propeller shaft liners.
Vesconite has been given approval by most of the ship classification societies, including:
- American Bureau of Shipping
- Biro Klasifikasi Indonesia
- Bureau Veritas
- China Classification Society
- China Corporation Register of Shipping
- Germanischer Lloyd
- Korean Register of Shipping
- Lloyd's Register
- Nippon Kaiji Kyokai
The long service life of Vesconite stern tube bushes is demonstrated by 15 years of experimental and survey results
obtained from the RP Jackson, a harbour pilot cutter.
The RP Jackson sails in and off Durban harbour in waters with high concentrations of abrasive, suspended sand particles
arising from propeller wash.
Superior wear figures of 1.5 to 3.0 mm (0.060" - 0.118") were obtained after each 5 year period of service. These
wear figures were remarkably low given the sandy harbour waters the Jackson operates in.
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