INFUSING
STEADINESS

what are anti-vibration mounts

There is an increasing demand to reduce noise emitted by plant and machinery. The use of vibration isolators is an important part of reducing noise and vibration from industrial and marine plant and from mechanical equipment located in offices, residential apartments, studios, theatres, auditoriums, schools and universities, hospitals and research laboratories and other critical low noise spaces.

Machinery vibration from rigidly mounted equipment can be transferred to the supporting structure and travel large distances to be emitted as noise elsewhere in a building or structure.

Generally, mountings should be selected to provide at least 70% isolation, i.e. no more than 30% transmission, against the lowest disturbing frequency of the system. For static applications, the maximum recommended strain in the rubber is 15% in compression and 30% in shear. Certain rubber-to-metal bonded mountings can also be used in shock applications to absorb energy, and compression strain levels of up to 30% are acceptable in this type of application.

Equipment which is resiliently mounted will have at least one natural frequency – the frequency or frequencies at which it will naturally oscillate. When the disturbing frequency and the natural frequency coincide, vibrations are amplified. The best vibration isolation, therefore, is achieved when the disturbing frequency is significantly higher than the natural frequency.

95%

The aim of vibration
isolation is to reduce
the transfer of
vibration to the
supporting structure
and a correctly
designed vibration
isolation system can
reduce vibrations by
more than 95%.

70%

Generally, mountings
should be selected to
provide at least 70%
isolation.

30%

Certain rubber-to-metal
bonded mountings can
also be used in shock
applications to absorb
energy and
compression strain
levels of up to 30%.

YOUR GUIDE TO MOUNTINGS

AREA OF USE

AREAPLATFORM & MOTOR MOUNTSSANDWICH MOUNTSLEVELING FOOT MOUNTSCAPTIVE MOUNTSCONICAL BUFFERSRUBBER BUSHINGSDOUBLE SHEAR BUSHINGSRUBBER PADS
PIPEWORK FITTINGS
BUILDINGS
ELECTRICAL MOTOS
COMBUSTION ENGINES
GENERATORS
HOUSEHOLD EQUIPMENTS
OFFICE EQUIPMENTS
COMPRESSORS
GRINDING MILLS
CHILLERS
FLEXIBLE JOINTS
MOBILE EQUIPMENTS
GUILLOTINES
PRESSES
PUMPS
PIPINGS
PUNCHING MACHINES
PRINTING MACHINES
SAW MILLS
ROLLING MILLS
CEILINGS
FANS
MACHINE TOOLS

TECHNICAL SPECIFICATION

SPECIFICATION Natural rubber SBR Styrene butadiene rubber Chloroprene Rubber Silicon rubber NBR EPDM
Ethylene propylene diene rubber
Polyurethane
Characterized by flexibility, strength and low temperature resistance as well as Excellent physical properties. Ideal for bonded rubber to metal products. Not Suitable for petrol, grease, oil and ozone. Similar to natural rubber, resistant to abrasion. Good resistance to high temperatures and cracking. Resistance to extreme low temperatures. Not resistant to petrol, benzene, greases and oils. All-purpose synthetic rubber, flame resistant. Resistant to abrasion. Very robust, good dielectric strength, particularly recommended for exposure to ozone and weathering. Silicon exhibits great temperature range capabilities. Silicons also have good resistance to ozone, weather and is also a good insulator. However, it has low tensile, tear and wear resistance. Resistant to abrasion. Good resistance to high temperatures and cracking, resistance to extreme low temperatures. Good resistance to petrol, greases and oils. Versatile in use, very good flexibility, resistant to ozone and weather, resistant to low temperatures.Can be used to protect against washing and spraying agents. Excellent resistance to wear and tear, best flexibility with highest shore hardness of all the elastomers, good resistance to oil and resistant to hydrolysis.
Hardness Shore A 40 – 90 40 – 90 40 – 90 25 – 80 40 – 90 40 – 90 55 – 98 Shore A
Temperature resistance 40°C to 70°C 40°C to 70°C -40°C to 125°C -70°C to 230°C -40°C to 120°C -40°C to 150°C -30°C to 80°C
Short-time peak temperature 80°C 80°C 130°C 250°C 125°C 150°C 100°C
Tensile Strength (Mpa) 10-26 10-20 10-25 5-15 10-20 5-20 17-38
elongation (%) 180-800 150-750 150-650 120-750 150-750 120-500 600-390
TEAR NM 10-100 10-70 10-60 10-18 10-50 10-50 25-60 N/mm
ASH CONT% 3-15 3-15 3-15 3-15 3-15 3-15
S.G. 0.98-1.2 0.98-1.2 1.25-1.4 1.1-1.2 1.1-1.25 0.90-1.2 1.21-1.18
COMPRESSION SET % 8-20 8-20 8-20 8-18 6-20 8-20 25-35
RESILIENCE% high medium high high to low medium to low medium high to low
Properties
Abrasion Excellent Very Good Good Poor Very Good Good Excellent
Compression Set Good Very Good Very Good Very Good Very Good Very Good Good
Adhesion to Metal Excellent Excellent Good Poor Good Fair Excellent
Resilience/ Rebound Excellent Good Very Good Good Good Good Good
Dynamic Property Excellent Fair to Good Fair Poor Very Good Very Good Excellent
Electrical Properties Good Good Fair Excellent Fair Good Good
Water Swell Resistance Excellent Very Good Fair to Good Fair to Good Good Excellent Good
Resistance to ozone Poor Poor Very Good Excellent Poor Excellent Good
Resistance to wear/tear Very Good Good Very Good Poor Good Good Excellent
Weathering effect Fair Fair Excellent Excellent Fair Excellent Moderate
Resistance to
Alkali Good Good Very Good Excellent Good Excellent Fair
Acid Fair to Good Fair to Good Fair to Good Fair to Good Fair to Good Good Fair
Alcohols Good Very Good Very Good Good Very Good Excellent Poor
Polar Solvents Fair to Good Poor Poor Poor Poor Excellent Not Suitable
Aliphatic Hydrocarbons Poor Poor Fair Fair to Good Very Good Poor Poor
Aromatic Hydrocarbons Poor Poor Poor Fair to Good Poor Poor Poor
Haloganated Hydrocarbons Poor Poor Poor Fair to Good Fair to Poor Poor Poor
Oils and greases Poor Poor Good Very Good Excellent Poor Fair
Water Good Good Very Good Very Good Fair Excellent Good