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Viscosity Does Not Equal Rheology: What Solder Paste Measurements Really Tell You
Viscosity is a useful solder paste quality control measurement, but rheology provides a more complete understanding of how paste will roll, fill, release, recover, and remain stable during stencil printing.
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Ask the Experts

May 21, 2007 - Updated
July 4, 2007 - Originally Posted

Lead-free soldering term?

Can anyone tell me what the definition of a "Hot Tear" is when referring to the soldering process using Lead Free Solder?

Michelle Elston

Expert Panel Responses

A crack in the solder joint formed by the metal pulling itself apart while cooling in the joint or a short time after its removal from the heat source. The defect is called hot tear when fracture takes place around or just after solidification of the metal. It may be known as a shrinkage or contraction crack.

Terry Jeglum
President/CEO, Electronic Technology Corporation

Mr. Jeglum has 35+ years experience and is the founder of Electronic Technology Corporation. He is responsible for 22 years of program management for the Company.

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Gripping Systems from micro assembly to heavy lifting
The first industrial-suited grippers from SCHUNK were a milestone. Since then we have brought countless newly and further developments to market.
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