Figure 3-84.-Corrugated fasteners and their uses.
(which have a plastic base) and mastics (which have
an asphalt, rubber, or resin base) are the two major
categories of adhesives.
The method of applying adhesives, their drying
time, and their bonding characteristics vary. Some
adhesives are more resistant to moisture and to hot
and cold temperatures than others.
Some adhesives are highly flammable;
they should be used only in a well-ventilated
work area. Others are highly irritating to the
skin and eyes.
WHEN USING ADHESIVES.
The primary function of glue is to hold together
joints in mill and cabinet work. Most modern glues
have a plastic base. Glues are sold as a powder to
which water must be added or in liquid form. Many
types of glue are available under brand names. A
brief description of some of the more popular types of
glue is listed below.
Polyvinyl resin, or white glue, is a liquid that
comes in ready-to-use plastic squeeze bottles. It does
a good job of bonding wood together, and it sets up
(dries) quickly after being applied. Because white
glue is not waterproof, it should not be used on work
that will be subjected to constant moisture or high
Urea resin is a plastic based glue that is sold in a
powder form. The required amount is mixed with
water when the glue is needed. Urea resin makes an
excellent bond for wood and has fair water resistance.
Phenolic resin glue is highly resistant to tempera-
ture extremes and water. It is often used for bonding
the veneer layers of exterior grade plywood.
Resorcinol glue has excellent water resistance
and temperature resistance, and it makes a very strong
bond. Resorcinol resin is often used for bonding the
wood layers of laminated timbers.
Contact cement is used to bond plastic laminates
to wood surfaces. This glue has a neoprene rubber
base. Because contact cement bonds very rapidly, it is
useful for joining parts that cannot be clamped
Mastics are widely used throughout the con-
struction industry. The asphalt, rubber, or resin base
of mastics gives them a thicker consistency. Mastics
are sold in cans, tubes, or canisters that fit into
hand-operated or air-operated caulking guns.
These adhesives can be used to bond materials
directly to masonry or concrete walls. If furring strips
are required on a wavy concrete wall, the strips can be
applied with mastic rather than by the more difficult
procedure of driving in concrete nails. You can also
fasten insulation materials to masonry and concrete
walls with a mastic adhesive. Mastics can also be
used to bond drywall (gypsum board) directly to wall
studs. They can also be used to bond gypsum board to
furring strips or directly to concrete or masonry walls.
Because you dont use nails, there are no nail
indentations to fill.
By using mastic adhesives, you can apply
paneling with very few or no nails at all. Wall panels
can be bonded to studs, furring strips, or directly
against concrete or masonry walls. Mastic adhesives
can be used with nails or staples to fasten plywood
panels to floor joists.
The mastic adhesive helps
eliminate squeaks, bounce, and nail popping. It also
increases the stiffness and strength of the floor unit.