In a liquid detergent (popularly called liquid soap) what customers look out for are:
1. Thickness (viscosity)
2. Nice fragrance and colour (aesthetic appeal).
3. Highly foaming (percentage of surfactant in the formulation).
4. Gentleness on the skin (pH friendly).
When I say gentleness on the skin I do not intend you to use liquid detergent for bathing. I see many formulating so-called shower gel using Sulphonic acid, SLS, Texapon etc. After you will see them adding glycerine and vitamin E - and shower gel is ready. Are you serious! These products are for liquid detergents. They are synthetic surfactants not intended for use as bathing products. If you need shower gel then get necessary training.
A liquid detergent should be gentle coming in contact with skin when you are using it as hand wash, for dish wash, laundary etc. If it itches it would mean the skin is reacting to a chemical or two.
The only chemical in most formualations that can be harsh on the skin is caustic soda (sodium hydroxide).
To ensure the product is not harsh on the skin use two spoons (70grammes) of caustic soda in 20litres of liquid detergent. This formulation will not have any adverse effect on a normal skin.
Many use 250grammes (quarter kg) of caustic soda in their liquid soap, I use just 70grammes (2spoons) and I use higher amount of soda ash to moderate the effect of the caustic soda in the formulation. This saves cost and ensure good product quality.
Not witstanding. There are a few people that have some reaction to liquid soap on their skin irrespective of your formulation. These are people with cases of dermatological allergy or hypersensitivity. In that case you add about 0.1percent glycerine in your liquid soap (i.e. 200ml in 20litres batch). Glycerine is hypoallergic.
Ensure that your liquid detergent formulation meets customer's quality as well as standard quality parameters.
Leave your question in the comment section. I will gladly attend to them.
For online training on commercial soaps and detergent Whatsapp: +2347037263653
Odfid Technical Center, Eket. Akwa Ibom State. Nigeria
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