SIST EN 15795:2010

Overview

SIST EN 15795:2010 is a European Standard developed by CEN that specifies the requirements for natural unexpanded aluminosilicates used in the treatment of water intended for human consumption. These materials, primarily aluminium silicate, serve as filtration and support media in water treatment processes. The standard outlines the physical and chemical characteristics, purity requirements, test methods, and practical guidelines for proper use and handling to ensure safe, effective water purification.

This standard applies to natural, unexpanded aluminosilicates like basalt, volcanic sand, and phonolith, which are mined and prepared through crushing, cleaning, drying, and sieving processes. Compliance with SIST EN 15795:2010 aids manufacturers and users in consistently selecting high-purity materials that meet rigorous safety and performance criteria.

Key Topics

• Scope and Application
  SIST EN 15795:2010 covers natural unexpanded aluminosilicates utilized specifically in potable water treatment systems. It defines material properties affecting filtration and sets test methods to verify conformity.

• Physical and Chemical Properties

  • Appearance: Hard, granular, light to dark grey crystalline particles with spherical or cubic shapes influencing filtration performance.
  • Particle Size Distribution: Defined ranges ensure optimal filtration; specified limits for undersize and oversize particles depend on application (e.g., multimedia vs. single-media filters).
  • Density: Loose bulk density ranges from 1,250 to 1,550 kg/m³; packed bulk density ranges from 1,400 to 1,750 kg/m³.
  • Chemical Purity: Acid-soluble material limited to max 10%; impurity levels must be notified if exceeding specified values. Typical composition includes SiO₂, Al₂O₃, Fe₂O₃, CaO, K₂O, and Na₂O.

• Test Methods and Quality Control
  Standardized test methods per EN 12902 ensure rigorous and reproducible evaluation of particle size distribution, bulk density, and chemical parameters. Sampling must follow detailed procedures to guarantee representative testing.

• Labelling, Transportation, and Storage
  Delivery methods include bags, semi-bulk containers, or bulk with cleanliness requirements to avoid contamination. Marking on packaging must identify product type, supplier, net quantity, and conformity statement. Storage conditions allow indefinite shelf life if kept properly.

• Safety and Compliance
  Products are generally non-hazardous and not regulated under the UN transport classifications or EU REACH at publication date, but users are advised to verify local regulatory compliance.

Applications

• Water Treatment Filtration Media
  Natural unexpanded aluminosilicates are widely used as filtration layers or support media in drinking water treatment facilities. Their physical structure allows effective removal of suspended solids and enhances filtration efficiency.

• Multimedia and Single Media Filters
  The particle size ranges and purity requirements enable their tailored use in multimedia or single-media filtration systems, depending on the specific needs of water purification plants.

• Support Layers in Filtration Systems
  Their mechanical strength and density provide vital support within filter beds, maintaining integrity under operational stresses.

• Chemical Stability and Safety
  With low acid-soluble content and variability in composition carefully controlled, these media reduce the risk of introducing unwanted substances into treated potable water.

Related Standards

• EN 12901:1999 – Definitions for inorganic supporting and filtering materials used in water treatment.
• EN 12902 – Methods of test for inorganic supporting and filtering materials, which provide standardized procedures for characterizing aluminosilicates.
• Other regional regulations and drinking water standards should be consulted to ensure full compliance with national water safety requirements.

Keywords: EN 15795, natural unexpanded aluminosilicates, water treatment, drinking water filtration, aluminium silicate, filtration media, particle size distribution, bulk density, chemical purity, CEN standard, potable water treatment standards, multimedia filters, single media filters.