Wrapping material

Can anyone suggest a suitable material which would provide a
protective completely inert wrapper for oversize pictures in their
frames. The pictures measure a minimum of 3 metres up to 4.5 metres
in some instances so ideally I am looking for an inert, thin, yet
flexible and strong covering material of around 4-5 metres in width
by several metres long. Suggestions with guides to sources of
availability would be appreciated.

Mark Vine
Conservation Resources
England

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                  Conservation DistList Instance 9:52
                  Distributed: Sunday, January 7, 1996
                        Message Id: cdl-9-52-016
                                  ***