| http://www.w3.org/ns/prov#value | - referred embodiment, the surfaces are first cleaned using a detergent followed by rinsing with an acid solution such as a nitric acid solution to remove particulate contamination and soluble heavy metals respectively. [0026] According to one embodiment of the invention, the surfaces to be bonded are contacted with a high pH solution, rinsed, pressed into contact and gradually heated to the desired
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