Supply Program Flame Retardants - HARKE Group

10
DOPO
Chemical Character
DOPO is a halogen-free flame retardant. DOPO stands for
9.10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. It
shows properties similar to the often-used brominated epoxy
resins, however, without evaporation. The reason for this is that
it is chemically bound to the matrix. During processing you have
to keep in mind that DOPO has to be used together with multifunctional
epoxy resins as for instance Novolacs because of the
fact that one epoxy group reacts at a time with one molecule
DOPO.
Fields of Application
Considering that common flame retardants evaporate, and that
this may lead to a significant health risk, the general trend goes
to halogen-free flame retardants.
With DOPO we offer a product that features excellent flame retardant
properties without evaporating harmful smells or odors.
DOPO is used in epoxy resins applied in the area of computer
circuit boards. Furthermore, it is always used where fire protection
is necessary, but harmful smells or odors are not welcome
as for instance in polyurethane, which is processed in mattresses,
construction foam, foam materials or upholstery. DOPO is
also used in high-power transformers on vessels, in the field of
automotive and aviation industry as well as in household products.
DOPO is also interesting for construction elements that
are exposed to higher temperatures.
Mode of Action
The mode of action is based on three processes: A highly flameretardant
carbon layer is formed on the surface, functioning like
a protective coating and thus reducing the amount of flammable
material. This process is also called “charring“.
A further effect arises through intumescence. By means of induction
of more gases a voluminous protection layer is formed.
Thirdly, PO-radicals form through heat and take part in the
radical combustion process.