The approach adopted in the study was relatively simple: By first
identifying what types of glassware are in use in the UK for food
contact application, a wide range of samples was collected to ensure
sufficient testing of all key glass compositions in conditions that
would replicate the most common usages.

Testing proved that, despite developments in production practices and
increases in recycling rates, elemental migration is still low from
commonly used glass compositions.

Glass, as a relatively chemically inert material, is used in a wide
range of ways and there are several distinct chemical compositions used
in contact with foodstuffs and beverages under different conditions. For
example, soda lime silicate is used in bottles, jars and tableware;
borosilicate for Pyrex and ovenware and lead crystal for decanters and
goblets.

Further, certain types of glassware are often treated, coated, washed,
surface damaged, cooked in, microwaved in and pasteurised during a
normal life cycle.

Copies of the report (No. A03029) can be obtained from:

Dr John Dixon, The Library, Food Standards Agency, Aviation House, 125
Kingsway, London WC2B 6NH. Tel: 020 7276 8060; e-mail:
john.dixon@foodstandards.gsi.gov.uk

Notes to Editors:

1. Glass Technology Services is the independent technology arm of
British Glass and operates completely autonomously providing services
under three headings - Analysis and Diagnostics, Consultancy and Project
Work to serve all customers who manufacture, work with, or use glass.

2. Various food contact materials can be used for food packaging so long
as they are safe. With regard to packaging in contact with foodstuffs,
migration is a concern as it can inadvertently affect the food or pose
health concerns to the consumer and this area, therefore, is under
constant research and regulation. The study comprised a programme of
experimental work designed to increase understanding of migration issues
related to glass materials in contact with foodstuffs. Although there
was data available on most commonly used glass types, most of this work
was historical and only lead migration from lead crystal had been given
extensive attention from the scientific community over recent years. As
manufacturing methods have developed over time, and issues such as
greater recycling rates and higher rates of imported glassware occur, it
was felt necessary to update this data.

Further information can be obtained from:

Dave Dalton
Glass Technology Services
9 Churchill Way
Sheffield S35 2PY
Tel: 0114 290 1801
Fax: 0114 290 1851
Web: www.glass-ts.com