Plastics & Polymers Case Studies

Heat Seal Adhesive Failure Analysis

Our client's new heat seal adhesive was not providing a hermetic seal and released after only a few days. Faced with production line shut-down and delayed shipments, the customer called Chemir. They suspected that the new adhesive's formula, a polyurethane-acrylic hot melt adhesive, was the reason for the failure. Our expert chemists deformulated both the old formula and the new formula. The results showed significant differences in the molecular weight and molecular weight distribution, as well as the urethane-acrylic ratio. After concluding that these variations were the reason for the adhesion failure, we recommended a formula adjustment. The revised formula performed well, and the customer was able to resume operations.

Litigation Support for a Manufacturer

An installation contractor brought a lawsuit against a glass-laminate manufacturer, claiming that incorrect product formulation had caused product failure. When our expert chemists performed a comparative analysis of a failed sample alongside a control sample, it was discovered that the glass-polyester laminates had experienced serious discoloration, degradation, delamination and hydrolysis. From the data gathered, our scientists were able to conclude that the manufacturer had used an incorrect UV stabilizer along with an unstable polymer formulation. Chemir scientists then presented the data and interpretations as expert witness testimony, which resulted in a positive outcome for our client.

Verification of Lead Concentration

A customer needed to know the concentration of lead contained in the PVC his company used to make screen door frames. Although analyzed previously by a different laboratory, our client believed their results were much too high. Chemir scientists prepared the sample and analyzed the digestates using ICP. Our result in thousands of parts per million (ppm) was much lower than the percent level concentrations obtained by the first laboratory. To help resolve the difference in results, we conferred with the client and the first lab and quickly determined a simple calculation error had occurred. The first lab then recalculated their data yielding a result very close to the concentration determined by Chemir. The additional care taken in our analysis and willingness to help resolve the difference resulted in a very happy client and two sets of consistent data.