Q1. Describe the roles of fillers, plasticizers and stabilizers in polymer processing.
Q2. A sphere of 100 mm diameter is to be coated with the chromium from a solution having chromium in the six valent (hexavalent) state. How much time would be required to produce a coating 20 µm thick if:
a) Current is 20 A.
b) The cathodic efficiency is 15%.
Atomic weight and density of chromium are 52 and 7.2 gcm–3 correspondingly.