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Subject: Adhesive for polyester film

Adhesive for polyester film

From: Mark Hingley <mark.hingley.nro>
Date: Monday, November 11, 2002
Karen Wall <kewall [at] risd__edu> writes

>Does anyone know the best adhesive to use when trying to adhere
>mylar to medium/heavy paper?  Input is greatly appreciated.

It seems to be fairly widespread practice in the UK to use what is
generically known as 'cross welder' to seal polyester films straight
to the surface of board and paper. These welders have an
electrically heated element which is covered with a strip of thin
PTFE coated glass cloth. The difficulty arises where the element is
mounted on the base rather than on the clamping arm. This means that
when sealing items in, they cannot be seen from above and only
partially from below. Many conservators have simply re-mounted the
heating element uppermost, but if one proceeds with great care this
is not strictly necessary. It is wise to practice with scraps as the
heat levels required will be lower than when bonding film to film
because of the insulating properties of the board. If the
temperature is too high, the board surface will turn brown. The
beauty of this system is that no adhesives are used and the
enclosure is both air and moisture permeable.

Mark Hingley
Conservation Section
Norfolk Record Office

                  Conservation DistList Instance 16:33
                Distributed: Thursday, November 14, 2002
                       Message Id: cdl-16-33-004
Received on Monday, 11 November, 2002

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