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WorksheetsCompound Design lab
Total questions: 20
Worksheet time: 20mins
Addition of ____ results in vulcanization of rubber
Nitrogen
Sulphur
DioctylPhatahlate
Silica
Example for reinforcement filler
Silica
China Clay
Barium Sulphate
Chalk
(a) is a curable compound without any filler
ODR is used to
(a)
Maturation period given after curing
24 hours
10 minutes
5 hours
30 minutes
Unit for Hardness
(a)
Instrument used to measure hardness
(a)
Commonly used curing temperature for Elastomers (in degree celsius)
100
250
150
200
Natural rubber is a polymer of
propylene
ethylene
isoprene
isobutylene
Cheapest moulding technique for curing rubbers is
(a)
Give two examples for synthetic rubbers
Role of stearic acid in a formulation
Role of using oil in a rubber formulation
TMT is a
fast accelerator
delayed action accelerator
slow accelerator
ultra fast accelerator
Role of DEG in a silica based filler formulation
phr in a formulation means
Mastication is carried out in
Calenders
Extruders
Open roll mill
Transfer moulding
Commonly used friction ratio for a two roll mill
1:2
1:1.15
1:1.25
2:1
Purpose of homogenization in compounding
Filler incoprporation
Proper dispersion of ingradients
Improves process ability
Avoids blooming
(a) roll is rotating at a faster rate in a two roll mill
