ADHESION PROMOTERS, COATINGS AND SEALANTS FOR DELRIN (ACETAL)
and MOST COMBINATIONS OF SUBSTRATES
an acetyl copolymer resin manufactured by DuPont Engineered
Plastics. Delrin® is lightweight and has excellent
dimensional stability, machinability and high mechanical
strength and stiffness. As a strong Polymer, Delrin® provides
good wear and abrasion resistance, a low coefficient of
friction and low moisture absorption, making the product
a good choice for use in high moisture environments. Delrin® is
an excellent choice for its long term mechanical stability
in applications such as Valves, Washers, Gears, Bushings,
Bearings, Seals, Rollers, Timing Screws, Electrical Components
and Anti-Friction Parts. It is most often used for electronic
office equipment, advanced conveyor technology and automotive
applications. It is important to note that although Delrin® is
strong mechanically, and offers excellent resistance to
moisture, gasoline, solvents, and many other neutral chemicals,
it cannot tolerate acidic conditions long term.
One of the properties of Delrin® that makes it difficult to bond to is its
low friction properties which are the result of the manufacturing process. Delrin® can
be bonded to but it requires careful preparation and BONDiTTM brand
primers and adhesion promoters in some cases, and BONDiTTM brand adhesives
manufactured by RELTEK
are among the few available that can be used to bond Delrin® to itself, and
to other substrates for harsh environments and long term deployment without debonding.
Our primary recommendation is using BONDiTTM B-45
BONDiTTM B-482 for bonding Delrin or Acetal.
Our recommendation would change if you are overmolding with elastomers such
polyurethane, where we would recommend using BONDiTTM A-43
as a primer/adhesion promoter for the urethane.
If exceptional chemical resistance is needed, we would recommend BONDiTTM B-481
or B-4811 instead of the B-45 or B-482.
Among the other substrates which Delrin® can be bonded to using BONDiTTM products
fluoropolymers, rubber, polyethylene, polyolefin, polypropylene, polyurethane,
silicone, thermoplastics, thermoset, urethane, glass, ceramics, wood, metals,
stone, aggregate and concrete.
Corona or flame etch is occasionally necessary to prepare the edges of a proposed
bond to strengthen the bond and reduce the slickness of Delrin®'s surface
chemical bloom. This can be expected to be necessary only about 15% of the time.
If you think that your application may require this treatment, please call us
at (707) 284-8808 or email us at email@example.com for
advice as this technique requires skill and experience.
our chart showing elongation rankings of the various BONDiTTM products
click here. Call or email us for advice on for COE ratings
and matching BONDiTTM products for
your application at (707) 284-8808 or firstname.lastname@example.org.