Metallurgy expert describes the difference between hot dip galvanized nails and electro-galvanized nails. Manufacturers have changed from hot dip galvanizing to electro-galvanizing. The zinc is a sacraficial materail; therefore, the protection afforded by the galvanize layer (zinc) depends on the zinc thickness. All other things being equal, the electro-galvanized nails with the much thinner zinc […]
Glass Expert Analyses a Broken Bottle
Glass failure analysis expert witness performs a root cause failure analysis on a broken bottle. This bottle broke into pieces (lowerleft figure). A failure analysis determined that the failure origin was in the bottle neck under the plastic cap (lower right figure). The glass expert removed the cap and the the residual polish (top left figure). […]
CPVC Plastic Failure Analysis of Hot Water Pipe Fitting
Plastic failure expert performs a failure analysis on a failed CPVC 90° 3/4 inch elbow. This elbow was in a 150°F hot water recirculation system in a large facility. Plastic fatigue was the alleged cause of failure. However, a plastic failure analysis found no evidence of fatigue. Instead, the detailed root cause failure […]
Glass Expert Performs Failure Analysis of Glass to Metal Seals
California failure analysis expert and manufacturing engineer was engaged to perform a root cause failure analysis of shallow cracking in the seal glass. These glass to metal seals were made by one manufacturer and then sent out to another processor to be plated. The photograph on the left shows two sight glasses. The body of […]
Machine Controls: Factory Safety or Manufacturing Safety Issue
Factory safety expert witness was engaged to determine the cause of a worker injury to an experienced operator/supervisor. The superviser was threading the machine with plastic sheet material when her hand was crushed. The accepted practice for threading was to feed the plastic sheet from the top and reach underneath to pull it through while […]
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