Flexibility and Adhesion

The combination of thermal, plastic and adhesive factors in Heldite is unique in sealant formulation.  Plasticity combats the effects of temperature and pressure changes, shifting levels and stresses associated with the assembly of dissimilar metals such as aluminium housings bolted to cast blocks.

The adhesive factor not only assists gasket location but in general practice has been shown to be an effective locking type sealant for imparting additional security to studs, splines and press fit bearings.

Heldite is completely waterproof and unaffected by seawater. The product is widely used for protecting electrical joint boxes and moisture sensitive instruments from the effect of damp atmosphere.

Anti-corrosive and Inert

Heldite has no effect on metals, rubber or other materials with which it is in contact.  It will inhibit stud corrosion and applied as a tank liner, will give protection against a wide variety of chemicals. Used as a coating between two dissimilar metals such as steel and brass in contact, it will prevent electrolytic action from the effects of sea water.

Non- Abrasive

Heldite contains no abrasive material and will not damage highly machined joint faces or such components as aluminium cylinder heads.

Fully Approved

Heldite is manufactured to commercial specifications 68-145/I (same as Ministry of Defence specification DEF 68-145/I which is now withdrawn).

Method of Application

Apply a coat of Heldite to each face and allow it to remain a few moments until the jointing becomes tacky. Close the joint. For screwed joint, apply one coat to each mating thread and screw up immediately.

All joints must be clean and dry and free from any cleaning agents.

Multiple applications, for example to a warped cylinder head, can often avoid the need for re-machining.

For joints made with washers of cork or absorbent material, apply one coat to each side of the washer or gasket and allow this to soak in.  A second coat should be applied to the joint faces, allow it to become tacky and then close the joint.

Heldite Characteristics

Adhesion:    High factor for adhesion to metallic surfaces.

Appearances:   Brown viscous liquid free from lumps and  abrasive material.

Chemical Characteristic: Inert and non-abrasive.

Resistance to Acids:   18 percent Hydrochloirc, 5 percent Sulphuric.

Specification:   Commercial specification 68 – 145/I

Specific Gravity:  0.9653 at 20 degrees centigrade.

Spreading Capacity:  70 square feet (6 square metres) per 500ml tin.

Temperature Range:   -40 degrees - +350 degrees centigrade.

Viscosity:   3.42 poises at 23 degrees centigrade.

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