Page 508 - Handbook of Adhesives and Sealants

440 Chapter Eleven

Substrate 1

Substrate 2

Adhesive “stops” are machined,
molded-in or otherwise fastened to
substrate 2 to prevent excessive
adhesive run-out.

f

Glass threads or microballoons
are incorporated into the
adhesive so that the substrates
cannot approach one another
more than the diameter of the
filler.
Figure 11.4 Adhesive starvation in a joint can be prevented by incorporating shims (top)
in the substrate itself, or (bottom) directly within the adhesive.

solvent solutions) have considerable tack. Tack properties vary widely
and are dependent on specific formulations.

11.6 Effect of the Part and Production
Requirements on Adhesives Selection
The part or assembly being bonded and its production requirements
are frequently important factors in determining which adhesive to use.
These factors should be considered early in the bonding process, as
they could determine the chemical type and form of adhesive most
appropriate to the application. Especially when the strength or service
environments are not an overriding concern, the part being assembled
and the production tools available quickly become major parameters
in the selection process.