Overview
SIST ISO 895:1995 is an International Standard developed by ISO Technical Committee ISO/TC 91 that specifies methods of analysis for technical sodium secondary alkylsulphates. These substances are a type of surface active agents derived from secondary alcohols and are utilized primarily in liquid form. The standard outlines precise analytical techniques to determine critical properties such as pH, water content, alkalinity, acidity, and the content of sodium alkylsulphates, sodium sulphate, and sodium chloride. Additionally, it provides procedures for measuring matter extractable by light petroleum and includes a general scheme of analysis in an annex.
This standard is essential for manufacturers, laboratories, and quality control professionals working with sodium secondary alkylsulphates, ensuring consistency and quality in product testing.
Key Topics
- Measurement of pH: Utilizes potentiometric methods to determine the acidity or alkalinity of aqueous solutions of sodium alkylsulphates.
- Water Content Determination: Follows azeotropic distillation techniques to quantify water present in the sample which is critical for assessing product purity.
- Free and Total Alkalinity/Acidity: Employs titrimetric methods for the accurate measurement of free acidity or alkalinity and total alkalinity, ensuring the chemical stability of surfactants.
- Matter Extractable by Light Petroleum: Defines a procedure to isolate sulphur-free products and sulfur-containing non-ionizing substances by extraction with light petroleum, indicating impurities or by-products.
- Sodium Alkylsulphates Content: Details evaporation and ethanol extraction steps to quantify the active surfactant content, while accounting for interfering substances.
- Sodium Sulphate and Sodium Chloride Content: Specifies separate titrimetric and potentiometric methods to determine these inorganic contents which impact product performance.
- Sampling Guidelines: Advises on proper sampling of homogeneous liquid products to ensure representativity according to ISO 607.
Applications
This standard is widely applicable in:
- Surfactant Manufacturing: For quality assurance of sodium secondary alkylsulphates used in detergents, personal care, and industrial cleaning formulations.
- Chemical Analysis Laboratories: Providing standardized analytical methods that produce reproducible and comparable results across international testing facilities.
- Product Development: Assisting R&D teams to characterize and optimize surfactant blends by precise compositional analysis.
- Regulatory Compliance: Facilitating adherence to national and international regulations regarding chemical content and purity.
- Procurement and Inspection: Allowing buyers and inspectors to verify supplier product specifications through standardized test reports.
Related Standards
ISO 895 references and works alongside several other ISO documents to ensure comprehensive surfactant analysis:
- ISO 607 - Surface active agents - Detergents - Methods of sample division.
- ISO 894 - Surface active agents - Technical sodium primary alkylsulphates - Methods of analysis.
- ISO 4314 - Determination of free alkalinity or free acidity by titrimetric method.
- ISO 4315 - Determination of total alkalinity.
- ISO 4316 - Potentiometric pH determination in aqueous solutions.
- ISO 4318 - Azeotropic distillation method for water content in surface active agents.
- ISO 4800 and ISO 4799 - Specifications for separating funnels and glass condensers used in analysis.
- ISO 1042 - Volumetric flasks for precision measurement.
These complementary standards help establish a full analytical protocol for surfactant quality control and research.
SIST ISO 895:1995 remains a crucial document for ensuring the accuracy, reliability, and consistency of analyses related to sodium secondary alkylsulphates. Adhering to this standard equips industries and laboratories with robust methods for chemical characterization, quality assurance, and compliance in surfactant production and application.