Group:

I have a some questions regarding T/E I'm hoping someone can help.

1. IPC-TM-650  2.4.18.1A  paragraph 5.3.4.2 requires a Cross head speed of
between .05 - .5mm/mm (.00197-.0197 in/in) but does not specify the speed to
use in the test. It seems to me that the cross head speed could affect the
elongation values.  The slower the speed the higher the elongation.  Is
there any validity to my thought or does speed not make a difference?

2. Tensile strength and elongation have an inverse relationship.  Higher
elongation = lower tensile.  Is this true?

3. Paragraph 5.2 requires a Pre Test bake.  Why? Does this bake affect T/E?
What if the board shop also baked the sample for 4 - 6 hours - Would a
double bake have twice the affect.

Thanks in advance for any help.

pete

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