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This is troubling to me, especially considering the following from the SYKCO tech spec page:

Penetrant Inspection - We Don't "Crack" Under Pressure!
Scrap Yard Knife Co. uses a specialized liquid penetration inspection, which reveals surface breaking flaws by bleedout of fluorescent dye from the flaw.

The technique is based on the ability of a liquid to be drawn into a "clean" surface breaking flaw by what is known as capillary action. (Capillary action is the force that is a resultant of adhesion, cohesion, and surface tension in liquids which are in contact with solids, as in a capillary tube.) After a period of time known as the "dwell", excess surface penetrant is removed and a developer applied. This acts as a "blotter". It draws the penetrant from the flaw to reveal its presence. Ultraviolet "black light" is used in darkened conditions to view the colored penetrants for any cracks, fissures, or other flaws.

What does this mean to you? It means your Scrap Yard knife will be free from microscopic cracks and fissures, invisible to the human eye under normal conditions.
So, I guess all that doesn't mean a thing if there's an air bubble? <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />


Our inspectors check the blades after heat treating. These air pockets do not show up on the "surface" of the steel and are often not exposed until after grinding. Even then they may not show up on the surface. Sometimes they show along the cutting edge, but not always. We have discussed the problem with the steel manufacturer and they claim that a few plates must not have been trimmed back far enough along the outer edges after the initial rolling. We are now trimming the outer edges ourselves and have not experienced any problems since we began this. The steel truly is remarkable. It is a shame that a few sheets slipped by the mill, but it has been completely out of our control. There should be NO future issues with this problem. The number of knives with this problem has been less than 1%. You have just been incredibly unlucky in this department.

Dan

Sorry for the problem. Please return the knife to our new shop location for replacement.

Send it to:

Scrap Yard Knives
11655 County Road 12
Wauseon, OH 43567

Last edited by Dumpster Dan; 03/04/08 03:44 AM.