M4 - Non-metals, Rubber & Elastomers

Question 1

elastomers

Answer 1

polymers that are having viscosity as well as elasticity and therefore are known as viscoelasticity

Question 2

natural rubber

Answer 2

used in the automotive industry and in the manufacture of medical tubes, balloons, adhesives

Question 3

polyeurethane

Answer 3

used in the textile industry for manufacturing elastic clothing

Question 4

polybutadiene

Answer 4

used for providing wear resistance in wheels of vehicles

Question 5

silicone

Answer 5

used in the manufacture of medical prostheses, lubricants as they have an excellent chemical and thermal resistance

Question 6

neoprene

Answer 6

used in the manufacture of wet-suits and in industrial belts

Question 7

types of elastomers

Answer 7

saturated elastomers

unsaturated elastomers

Question 8

saturated elastomers

Answer 8

• Good stability against oxygen, radiation, heat, and ozone

- Reactivity is limited to certain circumstances and condition

Question 9

unsaturated elastomers

Answer 9

• Cured with Sulphur vulcanization process

- Ex. Butyl rubber and natural polyisoprene

Question 10

temperature

Answer 10

specific working temperature of elastomers vary depending on the factors like media compatibility, seal design, and the dynamic and static operation

Question 11

low-temperature flexibililty

Answer 11

The rate of recovery of elastomeric material can be studied by subjecting the material to low-temperature retraction

Question 12

hardness

Answer 12

the measurement of the material’s resistance towards the deforming force for a defined length of time

Question 13

ageing

Answer 13

tells the behavior of a material when exposed to heat

Question 14

color

Answer 14

to differentiate between the compound grades based on their usage

Question 15

elongation at break

Answer 15

for testing the moment of rupture when the material is under tensile stress

Question 16

production processes of elastomers (9)

Answer 16

mixing
textile treatment
calandering
spreading
extrusion
mold curing
rubber-metal bonding
vulcanization
latex processes

Question 17

mixing

Answer 17

uncured compound is manufactured in order to be used for further processing into a rubber product

Question 18

textile treatment

Answer 18

Reinforcing material has to be treated to obtain dimension stabilized products with good bonding between rubber and the reinforcing material

Question 19

calandering

Answer 19

to make flat sheeting, rubber coated fabrics as uncured products or as semi product parts

Question 20

spreading

Answer 20

for manufacturing thin rubber coated fabrics

Question 21

extrusion

Answer 21

for manufacturing long length products which can be cured to final products or be used as parts in confectioned rubber products

Question 22

mold curing

Answer 22

for molding rubber (compression, transfer and injection molding) and for post-processing of cured products

Question 23

rubber-metal bonding

Answer 23

the metal has to be degreased and treated with bonding agents before molding or autoclave curing
(for good bonding between rubber and metal)

Question 24

vulcanization

Answer 24

All different curing methods used to cure products shaped by the previous processes

Question 25

latex processing

Answer 25

used for manufacturing of products from liquid rubber latex

in contrast to previous methods, which used dry rubber