How long does it take for J-B Weld to set, and what is the maximum pressure?

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The "world's strongest bond" is claimed by the brand name of steel-reinforced epoxy.

What is the maximum pressure it can handle, and what about the interaction between the steel and the epoxy that makes it so strong?

This is only a partial answer to the problem.I don't know why the strength is so I will leave it to the real chemists.

According to Repair Products, the JB weld in fully hardened state has a number of properties.

The pressure needed to break the material by pulling it apart is tensile strength.Flex strength is the pressure needed to bend the material which is equal to the strength of the sample.

The pressure needed to pull the bond from the surface is called the adhesion.When pulling parallel to the surface, the tensile lap shear is measured.

If it is applied precisely to the bond, this would be the maximum pressure the weld could endure.You will get a mixture between the two if the direction is different.