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CEMENTING CHEMCAST® GP
ACRYLIC TO OTHER MATERIALS Before specifying cementing for attachment of
CHEMCAST® GP acrylic to dissimilar materials, the possibilities
of mechanical attachment should be carefully evaluated. Properly
designed mechanical attachment overcomes the difficulties often
encountered with cementing. For some applications, pressure
sensitive, doublefaced tape may be suitable for joining
CHEMCAST® GP acrylic to other materials. Satisfactory joints between CHEMCAST® GP
acrylic and other plastics and nonplastics are more difficult
to make than CHEMCAST® GP acrylic to CHEMCAST® GP acrylic
joints and usually give lower joint strength. In most cases, there is a substantial
difference in thermal expansion between CHEMCAST® GP acrylic and
non-plastic materials. When joints between dissimilar materials
are exposed to rising or falling temperatures, the materials
expand and contract by different amounts, placing large stresses
on any bond between them. Only cements which remain permanently
flexible will continuously withstand these stresses. When it is necessary to cement CHEMCAST® GP
acrylic to nonplastics, the dimensions of the cemented area
should be as small as possible. This is especially true if
CHEMCAST® GP acrylic is cemented to materials that have much
smaller coefficients of thermal expansion than CHEMCAST® GP
acrylic. If it is unnecessary for the joint to be
transparent, many adhesives, such as silicones, polysulfides, and
rubber base adhesives are available. Most of these adhesives are
suitable for outdoor applications. |
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Copyright © Plastiglas de Mexico 1999
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