ZnPO4 setting time is 4-7 min. All of the following methods are employed to prolong its setting time except:
Correct Answer: Addition of drop of distilled water
Description: Control of setting time:
Manufacturing process
Sintering temperature : The higher the temperature, the more slowly the cement sets.
Particle size : Finer particles react more quickly as a greater surface area is exposed to the liquid.
Water content of liquid : Presence of excess water accelerates, whereas insufficient water retards the reaction.
Buffering agents : When added, slow down the reaction.
Factors under control of operator
Temperature : Higher temperature accelerates the reaction. Cooling the mixing slab is an effective way of slowing the reaction and prolonging the working time.
Powder-liquid ratio : More the liquid, slower the reaction.
Rate of addition of powder to liquid : The reaction is slower, if the powder is incorporated slowly.
Mixing time : The longer the mixing time (within practical limits), the slower is the rate of reaction.
Ref: Manappalil P: 90
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