Neutralization number or acid number or acidity is the mass of potassium hydroxide (KOH) in mg. that is required to neutralize one gram of chemical Soap bar and soap noodle.
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Reagents
a.
Neutralized rectified spirit.
b. 0.1 N Sodium hydroxide solution
c.
Phenolphthalein indicator solution
Neutralization Value Testing Procedure
1. Weigh
accurately about 1 gm of the fatty acid obtained in case of Total Fatty Matter
content determination in a 250 ml conical flask.
2. Dissolve
the fatty acid in 100 ml neutralized Rectified Spirit by heating gently.
3. Titrate the content with 0.1 N Sodium Hydroxide using Phenolphthalein as an indicator.Â
Calculate neutralization value
                   56.1 x V x N
Neutralisation
value = -------------------
                          W
V = Volume of
0.1 N Sodium Hydroxide solution required for titration.
N = Normality
of 0.1 N Sodium Hydroxide solution.
W = Weight of fatty acid taken in gm.
Accelerated Aging Test Procedure
Scope: This test method applies for conducting the Accelerating aging test or Accelerated aging test standard in Toilet Bar Soaps as well as for Soap Noodles
The soap bars both under test and standard should be placed in a clean jar fitted with a lid. The sample should then be placed in an evenly heated, well-regulated oven at 110 degrees F for one week. At the end of the test period, remove the jar from the oven and allow it to cool to room temperature before opening. Remove the soap and evaluate the color.Â
Examine all stamped surfaces for discolored spots or other signs of bad aging characteristics. Also, compare the fragrance of the aged samples with a duplicate soap bar that has been well-protected in foil and refrigerated.
Accelerated Aging Test : (Soap Noodles)
Accelerated Aging Test methods :
A sufficient quantity of soap noodles sample under test and standard should be placed in a clean jar fitted with a lid. The sample should then be placed in an evenly heated, well-regulated oven at 110 degrees F for one week. At the end of the test period, remove the jar from the oven and allow it to cool to room temperature before opening.Â
Remove the soap and evaluate the color. Examine the surface for discolored spots or other signs of bad aging characteristics. Also, compare the fragrance of the aged samples with a duplicate soap noodle sample which has been well protected in foil and refrigerated.
