Page 361 - Handbook of Adhesives and Sealants

316 Chapter Eight

Ease of application and processing equipment needed (jigs, ovens,
presses, applicators, etc.)
Total processing time (for assembly, for preparation of adherends,
for drying, for curing, etc.)
Cost of labor for assembly and inspection of the bonded parts
Waste of adhesive contributes to material costs and environmental
costs for disposal
Amount of rejected material as compared with other methods of
joining

Adhesive-materials cost should be calculated on a cost per bonded
area basis. Since many adhesives are sold as dilute solutions, a cost
per unit weight or volume basis may lead to erroneous comparisons.

8.2.6 Specific adherends and method
of applications
Adhesives may also be classified according to their end-use. Thus,
metal adhesives, wood adhesives, and vinyl adhesives refer to the sub-
strates to which they will bond. Similarly, acid-resistant adhesives,
heat-resistant adhesives, and weatherable adhesives indicate the en-
vironments for which each is best suited. In most of this Handbook,
adhesives are classified according to either their end-use or chemical
composition.
Adhesives are also often classified by the method in which they are
applied. Depending on viscosity, liquid adhesives can be considered to
be sprayable, brushable, or trowelable. Heavily bodied adhesive pastes
and mastics are considered to be extrudable; they are applied by sy-
ringe, caulking gun, or pneumatic pumping equipment.

References

1. Meier, J. F., ‘‘Fundamentals of Plastics and Elastomers’’, Handbook of Plastics, Elas-
tomers, and Composites, 3rd ed., C. A. Harper, ed. (New York: McGraw Hill, 1996).
2. ‘‘Adhesives and Sealants’’, Manual 260, Materials Engineering, May 1976.
3. Skiest, I., and Miron, J., ‘‘Introduction to Adhesives’’, Handbook of Adhesives, 3rd
ed., I. Skiest, ed. (New York: Van Nostrand Reinhold Publishing, 1990).
4. Gauthier, M. M., ‘‘Sorting Out Structural Adhesives’’, Advanced Materials and Pro-
cesses, July, 1990.
5. Gauthier, M. M., ‘‘Types of Adhesives’’, Adhesives and Sealants, vol. 3, Engineered
Materials Handbook, ASM International, 1990.
6. Damico, D. J., ‘‘Reactive Acrylic Adhesives’’, in Handbook of Adhesive Technology,
A. Pizzi and K. L. Mittal, eds. (New York: Marcel Dekker, 1994).
7. DeGray, D., ‘‘PUR Adhesives Offer Solutions for Assembly Challenges’’, Adhesives
Age, May 1998.