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Duralac Jointing Compound 115 ml

Duralac Jointing Compound 115 ml

Duralac Jointing Compound
Used in the aerospace industry as an essential corrosion inhibiting material wherever dissimilarmetals are joined. Use in marine/industrial applications wherever two metal surfaces are joined – even where components of the same metal are in contact and where metals contact wood, rubber, synthetic materials etc.


Duralac is a chromate containing jointing compound
designed to inhibit electrolytic decomposition between
dissimilar metals – often called galvanic corrosion.
It is a single pack, air setting product. Used correctly,
Duralac prevents anodic decomposition.
Duralac is a free flowing paste based on a synthetic
elastic resin and barium chromate. Duralac conforms to
specification DTD 369B, which superseded DTD 369A.
Duralac has low solubility in water and will not erode
with time, even when subjected to high pressure from
considerable water flow. Duralac enjoys excellent
adhesion properties to most substrates and because
of its tough flexible composition, has very low water
absorption. Duralac has a two year shelf life from the
date of despatch when stored below 20°C. Once a
container is opened, the remaining Duralac will form
a skin.
Duralac is indispensable for the sealing of joints between
dissimilar metals of all types, including magnesium and
its alloys. Consideration should also be given to galvanic
corrosion of the same metal where the electrolyte varies
in concentration forming a concentration cell. Duralac
has excellent protection properties for metals in contact
with wood, synthetic resin composition, leather, rubber,
fabrics etc. When components of a structure are of
different materials, it is essential the ‘points or faces’ of
contact be treated with Duralac to inhibit corrosion in the
presence of an electrolyte where considerable differences
in potential arise. Components of the same metal in
contact with one another under different stresses will also
benefit from the use of Duralac to inhibit corrosion.
For example Duralac may be used:
•Between aluminium alloy plates, extrusions and bolts
or rivets used in building applications.
•In general engineering applications where dissimilar
contact cannot be avoided.
•In vehicle building where aluminium alloy
contacts steel.
•For marine application where corrosion is accelerated
by brine concentration.
•In close proximity to the sea where a salt laden
atmosphere will meet with structures and set up
electrolytic cells.
•In aerospace where rivets/bolts are secured into
aluminium plates.

Duralac is supplied ready for use and must not be
thinned. It is best applied by brush. When Duralac is
applied to metal or other surfaces the volatile solvent
evaporates and the compound sets to the touch, but
remains tacky for a considerable period. It is important
that the joint should be closed while Duralac is still tacky
to ensure that it will flow sufficiently under pressure to
close the gaps in the joint. It will harden somewhat if a
thin film is left exposed to the atmosphere for a long
period and this will prevent the making of a close joint.
Supplied in 115 ml tubes. Larger size tins available to order.
Technical staff are available to advise upon Duralac
applications and special requirements.
100 G/m2 coverage.

Price: 16.60 (Including VAT at 20%)