Soaps: Determination of content of ethanol-insoluble matter

ISO 673: Soaps — Determination of content of ethanol-insoluble matter

What is Soap?

Soap, as the simplest cleaning agent, is obtained by combining fats or fatty acids with sodium or potassium salts. Soap shows surface-active properties when combined with water and has the ability to dissolve and clean dirt, oils and microorganisms.

What are the Types of Soap?

Solid Soaps:

• Powder Soaps: Used for general cleaning purposes.
• Bar Soaps: Used for hand, face and body cleaning.
• Hard Soaps: Specially formulated soaps, usually made by boiling at high temperatures.

Liquid Soaps:

• Pump Liquid Soaps: Used for hand and body cleaning.
• Baby Soaps: Specially formulated for sensitive skin.
• Antibacterial Soaps: Contains ingredients that are effective against microorganisms.

Special Soaps:

• Glycerin Soaps: Known for their moisturizing properties.
• Herbal Soaps: Contains natural plant extracts and oils.
• Aromatherapy Soaps: Contain essential oils and have relaxing effects.
• Therapeutic Soaps: Contain special ingredients against skin problems (acne, eczema, etc.).

What is the Scope of the ISO 673 Standard?

ISO 673 is a standard for determining the content of ethanol-insoluble substances in soaps. The standard method used to assess the purity and quality of soaps, ethanol-insoluble substances can indicate impurities in the raw materials and production processes used in soap production.

What are Insoluble and Foreign Substances in the Standard?

Within the scope of the ISO 673 standard, ethanol-insoluble matter is defined as 95% ethanol-insoluble matter added to soaps or low-level substances in the formulation, such as low-solubility additives, impurities, alkaline carbonates and chlorides.

Foreign substances can be carbonates, borates, perborates, chlorides, sulfates, sulfates, silcates, phosphates, iron oxides or organic substances such as starches, dextrins, caseins, sugars, cellulose derivatives.

What is the Purpose of the Standard?

The ISO 673 standard provides a method for the determination of ethanol-insoluble content in soaps.

Ethanol-insoluble substances represent unwanted by-products or impurities that may occur during soap production. Quantifying these substances is important for assessing the quality and purity of soap.

What are the Products Tested?

• Types of solid soap
• Types of liquid soap
• Other soap products

Basic Principle of Test Method

This method is based on dissolving the soap sample in a certain amount of ethanol and separating, drying and weighing the ethanol-insoluble substances.

The ISO 673 Standard is performed in the context of internationally recognized soap analysis and can be the source for assessments of product conformity.

Interpretation of Results

Purity Assessment: The amount of insoluble matter in ethanol indicates the purity and quality of the soap. A high amount of insoluble matter may indicate that the soap is of low quality or that there are problems in the production process.

Quality Control: Soap products must not exceed certain insoluble matter limits. These limits are set by product specifications and quality standards.

ISO 673: Soaps - Determination of ethanol insoluble content

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