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Related Experiment Videos

Element migration from glass compositions containing no added lead.

Michael J Hynes1, Sean Forde, Bo Jonson

  • 1Department of Chemistry, National University of Ireland, Galway, Ireland. michael.j.hynes@nuigalway.ie

The Science of the Total Environment
|February 18, 2004
PubMed
Summary

Lead-free crystal glasses are safe for beverages. Testing shows minimal element leaching, ensuring consumer safety and product durability. This study validates lead-free glass safety standards.

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Area of Science:

  • Materials Science
  • Glass Chemistry
  • Consumer Product Safety

Background:

  • Traditional crystal glass often contains lead, raising safety concerns.
  • Developing lead-free alternatives is crucial for consumer health and environmental safety.

Purpose of the Study:

  • To evaluate the safety and durability of lead-free crystal glass compositions.
  • To assess the leaching of elements into various beverages and solutions.
  • To validate the suitability of existing testing standards for lead-free glass.

Main Methods:

  • Prepared six lead-free crystal glass beakers (ca. 240 ml volume).
  • Determined elemental concentrations and compared them with theoretical values.
  • Assessed element leaching using 4% acetic acid (ISO 7086-1:2000), cola, red wine, 40% ethanol, and 0.3% citric acid.

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  • Analyzed migration of antimony, barium, bismuth, and zinc.

    • Main Results:

    • Experimentally determined element concentrations closely matched theoretical predictions.
    • Minimal leaching of tested elements (antimony, barium, bismuth, zinc) into all tested solutions.
    • The 4% acetic acid test (ISO 7086-1:2000) effectively indicated the highest degree of migration for lead-free glass.
    • Zinc migration correlated linearly with zinc oxide content in glasses.
    • Glass durability decreased with increased silica depolymerization.

    Conclusions:

    • Lead-free crystal glass compositions can be produced with good quality and durability.
    • Leaching levels are very low, posing no hazard to consumers for alcoholic or non-alcoholic beverages.
    • The ISO 7086-1:2000 standard is effective for assessing the safety of lead-free crystal glass.