Hello Noralee,

 

This requirement is meant to assess the overall “indentations” on a surface in a 300mm x 300mm square area.  The difficulty with analyzing several indentations of different sizes is that you cannot just count them (1, 2, 3) and make them equal as a larger indentation is a bigger issue than a smaller one.  So the “point value” chart assigns bigger indentations a larger number than “1” as they can be a bigger issue. So if a CCL surface (300mm x 300mm) has 3 (0.18mm indentations) “point value of 1”, 2 (0.36mm indentations) “point value of 2” and 1 (0.65mm indentation) “point value of 4”, then the “point value” score for indentations is 11 (1+1+1+2+2+4).  I now take that “point value” number of 11 down to table 3-4 “Surface Quality Classification” and see that with a point value of 11, my surface quality is “Class B”.

 

Please let me know if I or Microtek Laboratories can be of any further help.

 

 

 

 

 

 

Hi everybody,

I have one question about IPC 4101 as the following. Could you tell me how to comprehend "Point Value"?

Thanks a lot!


Best Regards,
Noralee