Technical Manual - Plastorgomma Service

Standard properties
Standard Properties/Special Constructions
All Optibelt ZR timing belts are oil, heat and cold
resistant as standard. They are not specifically marked.
Oil resistant
optibelt Oil resistance combats the contaminating
effect of mineral oil and grease so long as
large amounts of these substances do not
come into contact with the timing belt. Contamination by animal or
vegetable oil or water soluble machining oil will reduce belt life.
Where there are higher concentrations, we recommend the use of
special oil resistant Optibelt ZR timing belts.
Heat resistant
optibelt The heat resistant properties allow ambient
temperatures of up to approx. +100° C.
Temperatures above this could lead to
premature ageing and brittleness in the belt. For high ambient
temperatures, we recommend special heat resistant Optibelt ZR
timing belts.
optibelt
Cold resistant
The cold resistant properties allow ambient
temperatures of down to approx. – 30° C.
Lower temperatures will result in premature
belt failure. For low ambient temperatures, we recommend special
cold resistant Optibelt ZR timing belts.
The following special Optibelt ZR-timing belts are available for
special applications and demanding design requirements.
Special Compound Constructions
Extra oil resistant Optibelt ZR timing belts
Continuous high concentrations of oil or grease result in swelling
and rapid decay of the belts. In such cases we recommend extra
oil resistant Optibelt ZR timing belts which have added oil resistance
properties and largely withstand the damaging effects of
these substances. The extra oil resistant timing belts have been
developed to work in the following ambient temperatures:
Exposed to oil: from approx. – 35° C to approx. + 80° C
Extra heat resistant Optibelt ZR timing belts
Higher temperatures can affect the working life of the standard
Optibelt ZR timing belts. A high heat resistant Optibelt ZR timing
belt is available for ambient temperatures which are constantly
greater than 85° C but under 120° C. Special rubber compounds
largely prevent premature ageing and brittleness. Tests are useful
in border line cases as the working life is affected by specific drive
conditions such as the belt speed and pulley diameter.
Extra cold resistant Optibelt ZR timing belts
For ambient temperatures between approx. – 30° C to approx.
– 50° C we consider it advisable to use Optibelt ZR timing belts
which are extra cold resistant. Special rubber compounds prevent
the timing belt from becoming hard and brittle. The timing belt is
able to withstand the critical start-up phase without damage.
Practical tests are recommended in border line cases.
Anti-Static Optibelt ZR timing belts
Anti-static timing belts enable electrostatic build-up in the drive to
be safely dissipated. If the anti-static properties of a timing belt are
inadequate, the static build-up can be considerable and presents
a risk of ignition. If the Optibelt ZR timing belt is to be fitted in a
building when there is a danger of explosion, it is advisable to use
anti-static belts. The resistance of this timing belt is measured
according to ISO 9563 between two electrodes and does not
exceed 6 x 105 L
W
L = distance between the electrodes (mm)
W = timing belt width (mm)
Optibelt ZR timing belts with special compounds have ground top
surfaces as standard. Minimum order quantities available on
request.
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