UK Freight only 8.75
Heldite Jointing Compound
  • Click to enlarge

Heldite Jointing Compound

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.

Water Resistance
Heldite is completely waterproof and unaffected by Sea Water. 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 adverse effect on metals, rubber or other materials with which it is in contact. It will inhibit stud corrosion and applied as a tank liner (when supplied in bulk tins / drums for paint-on application), 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

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manufactured to commercial specifications 68-145/I (same as Ministry of Defence specification DEF 68-145/I which is now withdrawn)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 to Faces
Apply a coat of Heldite using a brush to each face and allow it to remain a few moments until the jointing becomes tacky. Close the joint. All joints must be clean, dry, and free from any cleaning agent. Ideal application temp. 15-25c

Method of Application to Threads
Apply one coat of Heldite using a brush to each mating thread and screw up immediately, wipe excess Heldite away to prevent dripping, but leave plenty around the immediately visible thread. All joints must be clean, dry, and free from any cleaning agent. Ideal application temp. 15-25c

Curing Time
20 Minutes to 8 Hours depending on Temperature and Humidity

Clean brushes and equipment with Methylated Spirits

  • 125 ml and 250 ml tins come complete with an applicator brush affixed to the inside of the screw cap.
  • 500 ml tin has a prize-off lid, like a tin of paint.
  • 7 ml squeeze bottle is for single job applications or product testing.

Suitable for use with

  • Petrol
  • Diesel
  • Bio Diesel
  • Lubricating Oil
  • Transmission Oil
  • Coolant
  • Domestic Heating Oil (28 Second)
  • Kerosene
  • Paraffin
  • Water
  • Sea Water
  • Steam
  • Gas
Technical Specification
AdhesionHigh factor, for adhesion to metallic surfaces
AppearanceBrown viscous liquid, free from lumps and abrasive material
Chemical CharacteristicInert and non-abrasive
Resistance to Acids18% Hydrochloric, 5% Sulphuric
Commercial Specification68-145/I (Same as MOD Spec DEF 68-145/I)
Specific Gravity0.9653 @ 20 Celcius
CoverageApproximately 16 m2 per 1 Litre

Shown Below; Heldite 125ml

Shown Below; Heldite 250ml

Shown Below; Heldite 500ml

Shipping Information
ProductCustoms Tariff Code

Download Heldite - MSDS PDFDownload Heldite - MSDS PDF

Product Options


Product CodeATK_Heldite

This field is required.
This item has been added to your cart...