is a thermoplastic, that is, it
is one of a variety of materials that have
the property of becoming hard and rigid when cured and are
moldable when heated. Polyurethane softens when
heated and hardens and become rigid again when cooled without
any appreciable chemical change. A polyurethane
is any polymer consisting of a chain of organic units joined
by urethane links. Polyurethane is
available generally in two forms, Thermoplastic Urethane
(TPU) or Thermoplastic (TP).
The TPU is a product of BF Goodrich, now Novion, the TP is a
Dow Plastics product. PU
is widely used in flexible and rigid foams, durable elastomers
and high performance adhesives and sealants, fibers, seals,
gaskets, condoms, carpet underlayment, and hard plastic parts.
Polyurethane products are often called "urethanes".
They should not be confused with the specific substance urethane,
also known as ethyl carbamate. Polyurethanes are not produced
from ethyl carbamate, nor do they contain that substance.
products may be altered by chemicals added
to them in the manufacturing process, producing differing properties
-- they also come in varying thicknesses -- both of which
their coefficient of expansion ("COE").
bonding of polyurethane to itself and to other substrates, requires
careful preparation and matching of the adhesive being used with
the differing COEs of
the substrates involved. BONDiTTM products
are among the few available that can be used to bond polyurethane
successfully over long periods of time to substrates with other
COE's for harsh
environments and long deployment without debonding.
Our first recommended product for polyurethane is either our BONDiTTM B-45
or B-482, depending on the grade of TP or TPU and whether it is polyether
Our other recommended product for polyurethane is simply using any
BONDiTTM B-4X line products, unless high chemical or
moisture resistance is required -- in which case we recommend using an adhesive
Among the other substrates which polyurethanes can be bonded to using
are: UHMW, Delrin, fluoropolymers, rubber,
polyethylene, polyolefin, polypropylene, other polyurethanes, silicone, thermoplastics,
thermosets, urethane, ceramics, glass, fiberglass, wood, metals, stone,
To see our chart showing rankings by property, including elongation,
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.