Scientifically Tested

We are extremely proud to say that, to date, K-Seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147.

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The conclusion was: “The test data shows that K-Seal is capable of sealing 0.635mm diameter holes and 0.254mm wide by 12.7mm long slots satisfactorily in accordance with ASTM D3147.” It was also confirmed that there was no presence of particles, gumming or gelling in the 0.85mm mesh tests.

What is ASTM D3147?

The only standard in the world that specifies what a product that seals engine coolant leaks should and should not seal is called “Standard Test Method for Testing Stop-Leak Additives for Engine Coolants”, or ASTM D3147 for short.
As of 2015, the only independent academic facility in the UK or USA that has the ability to test products to ASTM D3147 is Brighton University Engineering Division which, in a joint project with K-Seal which was supplemented by funding from the government, has been able to commission, build and run the necessary test equipment.

What does the test entail?

A test rig that simulates an engine’s cooling system has to be built to specific measurements set out in the standard’s conditions. It has to be controlled extremely precisely in order for tests to be repeated with the specified conditions replicated exactly the same way every time.
For instance, temperatures, water flow and pressure rates need to be exactly the same, and holes and slots need to be the same sizes. In fact, the holes have to be prepared by a specialist engineering firm who can guarantee accuracy at such a tiny diameter.

What conditions does a stop leak product have to meet?

An ASTM D3147-classified product must be able to:

  • Seal holes up to 0.635mm in diameter – this represents a severe leak which drain the system of coolant in about twenty minutes.
  • Seal a slot or crack up to 0.254mm wide by 12.7mm long – this simulates a crack and tests whether the product can seal longer areas of damage.

Pass through a mesh of 0.85mm without gumming or gelling together, both before and after running through a hot cooling system – this ensures that the product will not clog narrow waterways unnecessarily.

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