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Posted By ASC, Tuesday, August 22, 2017
Updated: Tuesday, August 22, 2017

BLOG:  Proper Testing is the Linchpin in Joint Design
By Dan Daley, Expert Blogger

Your homework is done, you have studied every aspect of your design, consulted with sales reps, and selected several adhesives for evaluation. You have a design and the makings of a process, including a thorough review of the adhesive manufacturers’ Technical Data Sheets (TDS).

About that TDS…it contains only one universally true statement:

The user should test the product in its intended application to determine its suitability

Or words to that effect, usually found in fine print.

Why is this important to my adhesive bonding application, you ask?

Because while every TDS is based on a laboratory testing protocol, it is fundamentally a marketing tool that has undergone a legal review prior to becoming available in the public domain. Values represented in the TDS are not defined as “average”, “minimum”, “maximum” or “best case” and thus only peripherally apply to your application. Regardless, it is unlikely the bonding conditions and surfaces match your application. It is the user’s responsibility with assistance from their adhesives supplier to validate TDS values for a specific application.

As an experienced materials engineer retired from a vehicle OEM, I strongly recommend developing an individualized test plan for your joint design and process predicated on Failure Mode and Effect Analysis (FMEA)...



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