ACRYLICS are high strength, structural adhesives that equal or exceed
the strength of epoxies. The advantages of this adhesive is a handling
bond in minutes and 90% of full cure strength in about two hours
without heating. An additional advantage is the ability to bond
substrates with minimal preparation, including oily metals. Acrylics
are two part adhesives consisting of a resin and accelerator to promote
the cure. Ideal for metals, plastics, and ceramics, this adhesive will
not work well on many porous materials and elastomers.
MIXING & APPLICATION:
Acrylics
may be used as a mix-in or no mix product. For bond lines up to 25 mils
the accelerator may be applied to only one surface. From 25 to about 50
mils it is necessary to apply the accelerator to both surfaces. Permit
the accelerator to dry and then add the resin to one surface and bring
the two substrates together. For large gap filling applications or over
50 mils, the accelerator must be mixed with the resin using the proper
mix ratio supplied by the manufacturer. Acrylics are now available in
dual cartridge dispensers with static mixers that eliminate the mixing
problems by dispensing the adhesive ready to apply.
SURFACE PREPARATION:
Surfaces
must be free from all grease or loose materials that may affect the
bond. Metals with thin films of oil may be bonded. Some plastics
require little preparation and others may require a solvent wipe or
primer and need to be roughened.
CURING THE ADHESIVE:
Acrylics
are available in various viscosities and set times. Follow the
instructions for the one you are using. Do not use the material after
setting has begun. A handling bond may be achieved in as little as two
minutes or up to 30 minutes. It is not recommended that heat be used on
acrylics.
SAFETY:
Follow
standard safety measure for using any chemical. Uncured acrylics have a
strong odor and adequate ventilation should be provided during mixing
and bonding operations. SELECT ACRYLICS for fast, high strength,
structural bonding of metals, plastics and ceramics to each other or in
combinations.
Materials to be bonded
Tapes
will adhere well to most clean, dry and well-unified surfaces. Typical
surface cleaning solvents are a 50/50 isopropyl alcohol (rubbing
alcohol)/water mixture or heptane. use proper safety precautions for
handling solvents.
It may be necessary to seal or prime some substrates prior to bonding.
A. Most porous or fibered materials; i.e., cement, wood, will require sealing to provide a unified surface.
B. Some materials, i.e., copper, brass, will require coating with lacquer or varnish to prevent oxidation of surface.
Some materials, i.e., copper, brass, will require coating with lacquer or varnish to prevent oxidation of surface.
Rub down pressure
Bond
strength is dependent upon the amount of adhesive-to-surface contact
developed. Firm application pressure develops better adhesive contract
and thus improves bond strength.
Application temperature
Ideal tape application temperature range is 70oF to 100oF (21oC to 38oC). Initial tape applications to surfaces at temperatures below 50oF (10oC)
is not recommended because the adhesive becomes too firm to adhere
readily. However, once properly applied, low temperature holding is
generally satisfactory.
After application, the bond strength increases and approaches the ultimate bond strength after 72 hours at 70oF (21oC).
In some cases bond strength can be increased and ultimate bond strength
can be achieved more quickly by exposure of the bond to elevated
temperatures; i.e., 150oF (66oC) for 1 hour. This provides better adhesive wet out onto the substrates.
General Information
All
applications, surfaces, surface treatments, solvents, paints, sealers,
etc. should be thoroughly evaluated by the user under anticipated use
conditions in conjunction with specific tape and substrate to be used
in the application.
SELECT ACRYLICS for fast, high strength, structural bonding of metals, plastics and ceramics to each other or in combination's.
