Polymer Technology
Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from __________ resins.

Epoxy
Urea formaldehyde
Melamine formaldehyde
Phenol formaldehyde

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Polymer Technology
Polyvinyl chloride (PVC)

Can be made thermosetting by adding a plasticiser
Is produced by polycondensation reaction
Softening temperature is 200°C
Uses either emulsion or suspension polymerisation methods

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