The original Duralac Anti-Corrosive Jointing Compound contains barium chromate, which is now regulated under the Poisons Act 1972.  Acquisition, possession or use by the general public is restricted.   For the last twelve years the chromate-free Duralac Green as an alternative to the original Duralac.  Duralac Green has superior technical and environmental properties, is tested to the same standard and is available in all the same package sizes as the original Duralac.

Inhibits electrolytic corrosion between dissimilar metals.

Used in the aerospace industry as an essential corrosion inhibiting material wherever dissimilar metals 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.
Inhibits electrolytic corrosion between dissimilar metals.

Duralac is a chromate free 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.
FORM 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 Duralac conforms to specification DTD 369B, which superseded DTD 369A.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.

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.