Most commonly used rubber vulcanisation agent is

Which one of the following statements is not correct? Vulcanisation of rubber makes it

A

Soft and flexible

B

Strong and hard

C

Chemical resistant

D

Withstand higher temperatures

In vulcanisation process, rubber can be hardened by adding

A

Nitrogen

B

Silicon

C

Sulphur

D

Alcohol

__________ of rubber decreases after its vulcanisation.

A

Resistance to the action of organic solvent

B

Tackiness

C

Maximum service temperature

D

Tensile strength

Vulcanisation of rubber

A

Decreases its tensile strength

B

Increases its ozone & oxygen reactivity

C

Increases its oil & solvent resistance

D

Converts its plasticity into elasticity

Vulcanisation of rubber does not increase its

A

Elasticity

B

Plasticity

C

Ductility

D

None of these

Vulcanisation of raw rubber makes it

A

Soft

B

Less elastic

C

Plastic

D

Tacky

Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its

A

Elasticity

B

Strength

C

Plasticity

D

Weathering characteristics

Most commonly used rubber vulcanising agent is

A

Sulphur

B

Bromine

C

Platinum

D

Alumina

Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?

A

Ammonium alum

B

Potassium alum

C

Both A & B

D

Neither A nor B

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A

Poorer tensile strength

B

Poorer resistance to oxidation

C

Greater amount of heat build-up under heavy loading

D

All of the above

Most commonly used rubber vulcanisation agent is

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