Hi Eric:

Both materials are inert in water. MMA will set better in damp conditions,
will set faster under a wider range of temperatures(you can control -
important if trying to hold awkward pieces in place), is less prone to
yellowing under UV, and, if you can find the right formulation, has a much
lower modulus of elasticity. Both materials will form a vapour barrier. We
don't normally use the "off the shelf' MMA as found in the adhives sold by
fastening companies for stone repair as the materials are far to strong and
very brittle. The Silikal Company out of Waterbury, CT has a broad selection
of materials to choose from.  Look at   http://www.silikalresins.com/.



Ken Johnson
Innovative Structural Preservation
Victoria, BC

----- Original Message -----
From: "Hammarberg, Eric" <[log in to unmask]>
To: <[log in to unmask]>
Sent: 21 June, 2001 3:42 PM
Subject: methyl methacrylate


> Can anyone shed light on the comparison between epoxy and methyl
> methacrylate? Which would be better in stone repairs near salt water?
>
> Eric Hammarberg
> Associate Director of Preservation
> Senior Project Director
> LZA Technology
> 641 Avenue of the Americas
> New York, NY 10011-2014
> Telephone: 212.741.1300 extension: 1016
> Mobile: 917.439.3537
> Fax: 212.989.2040
> email:  [log in to unmask]
>
>