How To Choose Right Rubber Material for Your Usage?

Date:2014-05-10View 6876 


1.Natural Rubber (NR)

As initially produced, consists of suitablepolymers of the organic compound isoprene, with minor impurities of otherorganic compounds, mineral salt plus water.

Merits:

In terms of comprehensive performance ,good elasticity ,ranking only next to BR; high elongation strength ,aftervulcanization ,it can be up to 16.7~28.4 MPa . for rubber reinforced by carbonblack ,it can be up to 24.5~34.3MPa; excellent resistance to electricalinsulation, good abrasion resistance and easy to bond other materials.

NR is better than other SRs.

Defects:

Poor oxygen and ozone resistance ,easyaging ,weak oil and solvent resistance ,bad performance of PH corrosion andunder heat.

Temperature Range:-60℃~+80℃.

Uses:

Mainly used in tyre, footwear, hose, cableinsulation and other common products; especially used for making engine shockabsorber ,molded products etc.

2.Styrene Butadiene Rubber(SBR)

It consists of the organic compound styreneand the chemical butadiene.It has nearly all the attributes of nature rubber,which is one of the most versatile copolymer rubber compounds.

Merits:

Superior abrasion ,heat resistance,anti-aging properties to NR;

Good elasticity ,while lower than NR;

Need to be reinforced by carbon black ,and costeffective.

Defects

Low elasticity ,poor anti-flex and tearresistance, bad processing performance .Especially ,poor autohesion andintension.

Temperature Range : -50℃~+100℃.

Uses:

Along with being used in the production ofauto tires, other obvious uses are in gaskets, belts and hoses formachinery,clutch pads for vehicles etc. instead of NR.

SBR also can be found  in sponges, rubber sheet or shoe soles. Thisrubber also can be used to coat walls, floors to avoid damp .

3.Butadiene Rubber

It consists of polybutadiene .

Merits:

High resistance to abrasion and cracking ;

excellent elasticity , and goodlow-temperature performance;

Better anti-aging stability than NR;

low heat build-up, easy to bond metal.

Defects:

Low intension ,bad tear and processingperformance , poor autohesion.

Temperature Range:-60℃~+100℃ .

Uses:

Blending with NR or SBR ,mainly employed intire treads ,conveyor belts or special cold-resistant products.

4.Chloroprene Rubber

A family of synthetic rubber known asneoprene  that are produced bypolymerization of chloroprene .

Merits:

Compared with other common rubber, CR hasgood performance of anti-oxygen, resistance to degradation by oil ,acid andalkali ,and excellent air tightness properties;

Superior anti-aging and anti-ozone to NR,SBR,NBR, while a little inferior to EPDM in this side;

It’s also non-flammable, which canself-extinguishing after fire, resulting in its appearance in weather strippingfor fire doors and in combat related attire such as gloves and face masks;

Burning point is around 260°C (500°F);

Fatigue resistance is better than NR.

Defects:

Low temperature endurance, poor electricalinsulation , easy to stick, roll ,and scorch.Besides,it is limited to specialproperties applications due to its high cost .

Temperature Range: -45℃~+200℃

Uses:

One of the most common format for CR isfoam sheets which can be configured to perform a variety of functions .As CRresists degradation better than NR, this relative inertness making it suitablefor demanding applications such as anti-ozone and anti-aging EPDM gasket,protective coating; anti-oil and chemical corrosion hoses;

Flame-retardant mining  rubber products; and various molded parts,sealing ring ,sheet etc.

5.Nitrile Butadiene Rubber

also called nitrile rubber ,is a syntheticrubber copolymer manufactured from acrylonitrile and butadiene.

Merits:

With good resistance to mineral oil,vegetable oil and grease ,which is relevant to the purity of ACN ,just rankingafter viton ,while superior to other common rubbers;

Have good resistances to water ,alkali andgas tightness, and have strong cohesive force ;

Anti-heat property is better than NR, SBR.

Defects:

Poor resistance to cold weather, acid andozone(but better than NR), low strength and elasticity which need to bereinforced by carbon black ,bad electrical insulation.

Temperature Range :-30℃~+100℃.

Uses:

The uses of NBR include automotivetransmission belts, hoses, O-rings ,gasket, oil seals etc.

6.Ethylene Propylene Diene Monomer Rubber

Being a type of synthetic rubber ,it is acopolymer of ethylene and propylene.

Merits:

The main properties of EPDM are itsoutstanding heat , ozone and weather resistance ;

Long service life under extremeenvironmental conditions and sustained flexibility ;

With excellent anti-aging property ,it canbe long-term used under 130℃;

EPDM has a good resistance to polarsubstances and steam ;It exhibits satisfactory compatibility with fluids ,ketones and other substances ,and unsatisfactory compatibility with most oils,aromatic and aliphatic hytrocarbon, concentrated acids.

Its other mechanical properties are justslightly inferior to NR, but are better than SBR.

Defects:

With poor self-adhesive and mutual stickyproperties ,EPDM is not easy to be bonded.

Temperature Range: -50℃~+150℃

Uses:

EPDM Rubber is used in chemical equipmentlining ,seals (used in dooror window seals to avoid rain and rust ).

The most common use is in vehicles, such asEPDM weather strips, EPDM trunk seals, EPDM trunk mat, EPDM sealing gasket,EPDM o-ring.

7.Fluoro rubber is also known as FKM ,andviton®

Merits:

Temperature resistance can be up to 300℃,itsmechanical properties remain intact at temperature of 250℃;

It’s incompatible with ketones such asacetone, organic acids etc.;

Resistance to oil is the best amongoil-proof rubbers;

Excellent electrical insulation, resistanceto chemical ,ozone and weathering .

Defects:

Poor processability ,high cost,and badperformance under cold environment ,low elasticity.

Temperature Range: -20℃~+200℃.

Uses:

Commonly used in O-rings, molded andextruded products.



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