General formulation and preparation of shaving preparation

General formulation:

                        Stearic acid                             38.8 gm

                        Coconut oil                             9.7 gm

                        KOH                                       8.0 gm

                        NaOH                                     1.6 gm

                        Glycerol                                  11.6 gm

                        Water                                      30.3 gm

                        Preservatives                           S.Q

                        Perfume                                   S.Q.

Preparations:   amount of stearic acid and coconut oils are melt. Add NaOH and KOH and stire. Separately in another beaker glycerin and water are mix together and heat it at 65º C temperature. Now the aqueous preparation from the second beaker is put into the first beaker with continuous stirring until pasting consistency is not appear.

Shaving preparation & its characteristics

Substances that is applied to the face or wherever else hair grows, to provide lubrication and avoid razor burn during shaving. Shaving cream is often bought in a spray can, but can also be purchased in tubes. Shaving cream in a can is commonly dispensed as foam or a gel. Creams that are in tubes are commonly used with a shaving brush to produce a rich lather.

Characteristics:

• Must have well lubricant properties, skin protection against razor.
• Must have hydrating properties and softening properties.
• Should be smooth and non-dumpy.
• Must be well tolerated and non-irritant.
• Should not change viscosity according to temperature..
• Easy application, easy spread.
• Must have good wetting properties
• Small quantity should produce desired lather.
• Should be non-corrosive.
• Must be economical

Evaluation of shampoo.

Evaluation:

Performance characteristics:

Foam and foam stability (Ross-Miles foam column test): 200 ml of shampoo solution dropped into a glass column containing 50 ml of the same solution. The height of the foam generated is measured immediately and again after a specified time interval and considered proportional to the volume.

Detergency and cleaning action (Barnet & Powers test):Detergency depends on;

The effect of water hardness,

Surface tension and wetting

Surfactant content

Procedure: 

5 gm of sample human hair is placed at 35º C in 200 cc of water containing 1 gm of shampoo. The flask is shaken 50 times for 4 minutes and then wash, filter and dry it and weighted. The amount of soil removed under this condition can be calculated.

Wetting action (Canvas disk sinking test): 

6 canvas disk made up of mount veron cotton 1 inch in diameter is floated on the surface of the solution, and the time required to sink is measured accurately.

Rinsing: Skilled beauticians can make comparison on the performance of different shampoos.

Conditioning action: 

The degree of conditioning given to hair is ultimately judged by shampoo user who is making the evaluation on the basis of past experience and present expectation.