Ultra long life
Ideal for high loads with precision
clearances in dirty or wet conditions.
An Exceptional Bearing Material
Developed to solve wear problems in unlubricated and dirty applications, Vesconite Hilube
is a premium long life, low maintenance plain bearing material, which also gives
outstanding performance when lubricated.
Vesconite Hilube is compounded from an advanced
engineering thermoplastic incorporating a PTFE internal lubricant.
It has a very low dynamic friction (approaching that of
PTFE) and an even lower static friction. The low static friction means no stick-slip
problems in applications with intermittent motion.
When relatively high loads and sliding speeds apply,
Vesconite Hilube has outperformed all expectations. With very low friction, it is a
major advance, offering long wear life. It shows exceptionally low wear rates when
lubricated, whether this occurs at fitting only or regularly.
Vesconite Hilube overcomes the limitations of metallic
bearing materials and conventional engineering plastics. Vesconite Hilube combines a
load bearing capacity higher than white metal (babbitt) with more than ten times the wear
life of bronze in poorly lubricated or dirty conditions. Its self lubricating
properties are far superior to nylon. But unlike nylon based products, Vesconite
Hilube does not swell in water or in humid conditions.
Proven in numerous industrial trials, Vesconite Hilube is ideal for carrying high
loads with precision clearances.
Insensitive to lubrication lapses, dirty, wet or corrosive
conditions, it is the user-friendly bearing material for the future.
Long Life - with little or no
Extended wear life is crucial. In the 1960s
nylon was an improvement upon bronze in many plain bearing applications. In the
1970s Vesconite Standard was a development crucial to reducing maintenance. It
proved a great advance on nylon and bronze, and improved upon white metal in many
applications. Vesconite Hilube is the tribological breakthrough of the 1990s, with
up to 5 times the wear life of Vesconite Standard. With little or no grease, it
gives many times the wear life of metal bushes.
The dynamic and static unlubricated friction of
Vesconite Hilube against steel goes as low as 0.08 - similar to glass and graphite filled
PTFE and one third that of nylon.
The dynamic friction co-efficient of Vesconite
Hilube remains constant over long periods of operation, unlike many so-called
low friction materials where the friction co-efficient starts off low but rises
steadily. Vesconite Hilube's friction remains low even with a rise in
temperature. It declines to its lowest at 60 �C (140 �F), even under high
High Load Strength
Vesconite Hilube shows very low creep rates under load
and has high fatigue strength. The recommended maximum design load for static and
intermittent motion is 30MPa (300kg/cm�, 4250 psi), much higher that the design limits for white metal,
nylon, PTFE and glass filled PTFE.
The load carrying capacity of Vesconite Hilube is not
affected by water or humidity. This is a major problem for nylons which soften in
moist environments and lose up to two thirds of their strength. Moisture increases
the wear rate of nylons and leads to creep when under load.
Vesconite Hilube has proved particularly superior in high
No Water Swell
Vesconite Hilube when fully saturated with water - a
process which takes many months - absorbs less than 0.5%. This leads to a linear
swell of less than 0.07%, which in most applications can be ignored.
In comparison nylons absorb moisture by as much as 9% of
their mass, causing up to 3% swell and a critical loss of clearance - often leading to
Vesconite Hilube has a comparatively low coefficient
of thermal expansion. The thermal expansion is one third less than nylon and acetal,
and 4 times that of bronze.
When replacing metal parts, Vesconite Hilube requires only
slightly more clearance. No allowance needs to be made for moisture changes.
This is a critical advantage, as the most common reasons for the failure of polymer
bearings are thermal expansion and water swell.
Vesconite Hilube may be used continuously at 100�C (212�F) in dry
applications, and for short periods at higher temperatures. Load limits should be
reduced to half when operating above 80�C (176�F). Consult an accredited Vesconite
Hilube distributor for applications where temperatures may exceed 100�C (212�F).
Load and Speed Limits
The product of load and bearing surface speed -
commonly called the PV limit (pressure x velocity) - is often given as a design
guide. The PV limit of Vesconite Hilube is over four times that of nylon and twice
that of Vesconite Standard. PV limits are usually determined in laboratories and are
not always applicable to field applications.
Many factors affect PV limits, particularly lubrication,
load and speed. For a given load, the bearing surface speed may be greatly increased
with improved lubrication and cooling through circulation, as the index shows:
|Dry - no lubrication
|Greased on assembly
|Periodic lubrication (oil, grease)
|Circulating oil lubrication
|Circulating water lubrication
Less Wear to Metal Mating Parts
Vesconite Hilube reduces the wear experienced by metal
mating parts by over 90%. Mating part wear is a particular problem with metallic and
nylon based bearings, especially when using unhardened metal shafts.
This valuable benefit alone justifies the changeover to
Vesconite Hilube when dealing with expensive shafts.
Vesconite Hilube is resistant to organic solvents,
petrol, oils and acids. It has limited resistance to concentrated strong
Vesconite Hilube Production list
Member, International Association of
Plastic Distributors (USA)
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Updated Dec 15 2011
visitors since Feb 28 2005