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Types of rubber
We will go on near the characteristics for the different rubbers to
give you an idea of quality and applications.
NR
What is?
NR is Natural Rubber
Characteristics
- Low price.
- Excellent mechanical resistance and good abrasion properties
gtting compounds with good mechanical properties for a high secotr
of temperatures.
- Excellent resistance to avoid fading fissures.
- Good resistance for low temperature.
- High chemical reactivity, doing it very sensitive for rusting
and ozone to have a good resistance.
- It can be manufactured with a long different shore hardness
35-90º Shº approx.
- Swlling in contact with disolvents, reducing its mechanical
resistance.
Applications
- Manufacture for large tyres.
- Hoses.
- Hoppers.
- Automobile pieces
- Civil engineering.
- Shoes industry.
- Etc
NBR
What is?
NBR is Nitrilic Rubbers, which are sintetized polymers form
butadiene and acrilonitrile.
Characteristics
- Resistance for no polar compounds, as gas, oil and waterburnts.
- Compatible with PVC, getting more resistance than no polar compounds,
heat, abrassion and ozone, in contact with smelling aromatic waterburnts.
- It can be manufactured in a big kind of shore hardness 40-90º
Sh.
- Moderated resistance low temperatures.
Applications
- Joints.
- Diafragms.
- Hoses.
- Pipes.
- Shoes Industry.
- Different unclassified products for hopping fluids.
CR
What is?
They are polymers from 2-chloro butadiene. CR means Chloroprene
Rubber.
Characteristics
- This is the kind of rubber offers best balanced properties,
is moderated goud for every applications. It has a resistance
near some NBRs when it is contact with waterburnt disolvents.
- Good heat resistance and medium in low temperatures.
- It can be produced in many different hardness between 40 and
90º Sh approx.
- The are autofinished rubber, it burns near a flame and finish
burning when the flame is far.
Applications
- Civil engineering.
- Protected over wires.
EPDM
What is?
Polymers coming form reaction between etilene, propilene and
diene.
Characteristics
- Low cost.
- Low density.
- Good ageing resistance, to atmosphere and temperature.
- Good attacked ozone resistance, rusting and some chemical no
watercarbonated compouns.
- Low behavior in contact with grease, oil, gas and watercarbonated
isolvents.
Applications
- Profiles for automobiles, doors and windows.
- Cover for wires.
- Joints for pipes and electric wating.
SBR
What is?
Polymers of butadiene and estirene.
Characteristics
- Excellent abrasion resistance.
- Good behavior to heat disipation.
- Good resistance in appearing fissures.
- Good ageing resistance by heat and rusting.
- Good ozone and atmosphere resistance.
- It is not good for uses that require a long contact with disolvents,
oils and greases.
Applications
Uses covers wire coating shoes industry transmission straps. Several
machines elements for Public job sites.
SYLICONS
What is?
Sylicon rubbers do not contain in their main chain any carbon. The
necessary energy to break the union Si - O is much higher than in
the case for C - C or C - O unions, it brings to theses rubbers
a special properties.
Characteristics
- Very Good termic stablisment (major than every rubbers, except
the fluored).
- Excellent ozone and atmosphere resistance.
- Good displacement and flexibility in low temperatures, it can
mantain its own properties near - 60ºC
- Good heat resistance, near 200ºC. Good ageing.
- Good mechanical properties. Although they do not have some desviation
in ageing process.
- Good electric coating, hard to burn and do not propagate the
flame, they are autofinished.
- It can be damaged in contact with some disolvets, ils, ..
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