Determination of DRC of Fresh Latex

AIM:

To determine the DRC of Fresh latex.

APPARATUS:

• Cotton waste
• Rubber stopper
• 50ml Erlenmeyer flask ( dried)
• Electronic balance
• 250ml beakers(2)
• Air oven
• Water bath

REAGENTS:

• Distilled water
• 1% Acetic acid solution

PROCEDURE:

• Shake the given sample of latex bottle.
• Transfer 20-25ml latex into a 50ml erlenmeyer flask provided with a stopper.

• Weigh about 10-20gm latex using an electronic balance.
• Note the weight taken.
• Pour the weighed latex into a 250ml beaker. A duplicate should also be done.
• Add equal amount of distilled water.
• Add about 2-3ml of 1% Acetic acid per gram of latex sample.



• Keep the solution undisturbed for 15 minutes on a water bath.
• When the serum is clear, filter it through whatman No: 1 filter paper.
• Thickness of the coagulum is reduced to about 2mm by hand roller.
• Collect any small particles of coagulum present in the beaker by rubbing it with main bulk.
• Wash the coagulum with running water for at least 6 changes of water.
• Dry the coagulum in an air oven at a temperature of 70 degree Celsius for 1 day or for 50 degree Celsius for 2 days.
• Cool for a while & take the final weight.
  

CALCULATION:

DRC of fresh latex =(weight in gm of dried film/weight in gm of latex sample taken)*100