Stress cracks no longer an issue in LCP connector


Japanese connector manufacturer JST Corp. has selected a Vectra liquid crystal polymer (LCP) from Ticona Engineering Polymers (Kelsterbach, Germany) to solve weldline and cracking issues in a Secure Digital (SD) connector product.

"With technical assistance from Ticona, JST was able to switch to Vectra S135 and start molding thin-wall parts with excellent process consistency and good surface appearance," says Miguel Padilla, JST molding supervisor at JST in Waukegan, IL. "Now we have the extended operating temperature and flowability that allows us to consistently fill these complex geometries while, at the same time, maintaining tight tolerances and avoiding assembly process issues."

When molding with a 10% glass, 30% mineral-reinforced LCP resin with a deflection temperature under load (DTUL) of 248°C, JST had been experiencing weldline issues and occasional cracks that developed during the assembly process. JST needed an engineering thermoplastic with a higher heat deflection temperature (HDT) profile that could withstand the particularly challenging dimensional considerations and withstand lead-free soldering demands of this SC connector application for handhelds such as bar code scanners....
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