Flywheel Caster-Professional caster wheels manufacturer since 1981 for machinery, material handling and industrial etc.
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Flywheel Caster-Professional caster wheels manufacturer since 1981 for machinery, material handling and industrial etc.
The normal temperature limits of our standard wheels and castors is 0°C to 60°C. Within these limits our products work normally for their full working life. In colder
or hotter conditions they behave differently, and/or may need to be modified to work efficiently.
Low Temperature use:
Below 0°C you must specify temperature of use at the time of ordering. The standard grease we use in our castors is a lithium complex grease. This has excellent
water resistance, bearing retention and long life. But below 5°C it begins to stiffen quickly, and will soon freeze the bearings so that neither the castor swivel nor
the bearing revolve. So long as it is specified at the time of ordering, we use a special aeronautical grease (Aero Shell 7) which is a synthetic oil with a microgel
thickener. This is compounded for use down to -73°C, and will need to be refreshed every 6 to 12 months, but will continue to work effectively in chilling rooms,
freezing stores and outdoor winter use in northern countries where ordinary greases would be useless.
As the temperature becomes lower, the softer rubber and polyurethane treads on our wheels begin to stiffen and become less elastic. For example, the
polyurethane used on the 'H' series slowly stiffens from +20°C down to -20°C, but then rapidly stiffens until at -50°C it becomes brittle.
As temperature goes below 0°C, nylon can become brittle, particularly if it is kept for long periods in the very dry air in freezing rooms. At such times we
recommend fibre glass reinforced wheel which can be used down to -30°C. For very cold conditions try a set of wheels first under actual working conditions.
High Temperature use:
Above 60°C you must specify temperature of use at the time of ordering. As temperatures increase, tyre materials become softer, and this lowers the load capacity.
At still higher temperatures (and when hot for longer periods) the materials begin to deteriorate, which shortens working life.
As a general rule you can use any product at its normal load up to 60°C. Thereafter you must show some care. Our lowest cost wheels of polypropylene begin to
lose considerable strength between 60°C and 100°C, and by 145°C are practically strengthless.
Rubber tyred wheels are similar.
Polyurethane tyres retain most of their properties up to 90°C even for long periods (apart from a gradual lowering of load capacity) and can be used for short
periods at even higher temperatures. However, caution is needed. For example, at 100°C they lose only 5% of their tensile strength after 20 days, but at 120°C they
are down to 50% in 20 days, while at 150°C they are down to only 15% in 5 days. Fibreglass reinforced nylon wheels are the preferred wheel for extended periods
up 210°C (assuming most of their life is spent outside the oven), and for short periods up to 230°C.
Phenolic wheels (with special inorganic fillers) are the preferred wheel for extended periods up to 280°C (assuming most of their life is spent outside the oven), and
for short periods up to 300°C. These have a thick cross section, but are more brittle than either nylon or ordinary grades of phenolic. Supplied with a PTFE bush.
For sustained high temperature use, we offer a range of cast iron wheeled castors (caution is needed as cast iron wheels will damage concrete floors), used with
high temperature grease (Neoplex HT300). This grease can be used up to 230°C for long periods. Above 230°C even more exotic greases need to be used. Consult
the factory.
*Our standard grease is good for -20°C to 120°C.
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