liquid soap

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liquid soap

Liquid soaps are surfactants and surfactant mixtures that are dissolved in water and are therefore in liquid form. Liquid soaps are mostly used in personal care products and cleaning products. Liquid soaps for cleansing the skin do not usually contain soap , but synthetic detergents .

properties

The liquid soaps consist of a solution or emulsion of synthetic surfactants in water. In contrast to the classic, fatty acid-based soaps , these do not form sparingly soluble lime soaps with the calcium in tap water , such as B. in the limestone edges of the bathtub or the gray haze on textiles , since the solubility of synthetic surfactants with or without calcium ions in water is significantly higher. In addition, the synthetic no longer react alkaline , so that the pH value of the skin or a textile rises less. Liquid soaps are often used in health care facilities, public washrooms and toilets because their constant viscosity means they can be dosed and, unlike soap mills, they do not form lumps.

Liquid soaps are similar in composition to dishwashing detergents , shampoos , shower and bubble baths. The goals of the development of liquid soaps are improved dermatological compatibility, greater foam formation, improved rinsing properties and skin feel, as well as constant refatting and moisture supply. The INCI coordinates the standardization of the products and the nomenclature for the substances they contain.

Hygienic aspects

A study from 1988 found that bars of soap contaminated with bacteria do not leave any germs on the hands and therefore there is no hygienic advantage of liquid soaps that can be dosed. On the other hand, other studies from later years, which were carried out under application conditions in the clinical sector , repeatedly demonstrated contamination of bar soaps with bacteria. To prevent nosocomial infections, the Working Group of the Scientific Medical Societies in Germany (AWMF) recommends the use of liquid preparations from a dispenser for medical practices and clinics. To prevent microbial colonization of the donors, they must be easy to clean and disinfect. Liquid soap should be filled using hygienically safe disposable containers.

Web links

Commons : Liquid soap  - album with pictures, videos and audio files

Individual evidence

  1. Ursula Kindl: Skin Cleansing . In: Wolfgang Raab, Ursula Kindl (ed.): Care cosmetics: A guide . 5th, revised edition. Wissenschaftliche Verlagsgesellschaft, Stuttgart 2012, ISBN 978-3-8047-2761-8 , p. 215 .
  2. Julia Kahlert: Liquid soap or bar of soap? In: CodeCheck. CodeCheck AG, Switzerland, December 12, 2018, accessed on July 28, 2019 .
  3. ^ John E. Heinze, Frank Yackovich: Washing with contaminated bar soap is unlikely to transfer bacteria . In: Epidemiology & Infection . tape 101 , no. 1 , August 1, 1988, ISSN  0950-2688 , OCLC 15218155 , p. 135–142 , doi : 10.1017 / s0950268800029290 (English, ISSN for print edition).
  4. Recommendations on hygiene in clinics and practices - hand disinfection and hand hygiene. Hand washing. Working Group of the Scientific Medical Societies in Germany (AWMF) , August 2015, accessed on March 13, 2020 .