The following message is being sent for the leaders of IPC Task Group 5-24c
 
One of the weaknesses of the current J-STD-006 is Table 3-1 Particle Size Distribution of Standard Solder Powders.  The comment is that the table does not represent powder manufacturers actual specs.

As chairman of the 006 committee I am asking that you make any suggestions for changes to the table based on your own "real world" specifications.  If you need to foreword this email to a more appropriate person with-in your company, please do so.  If your company does not with to submit changes because your company views this information as proprietary that is fine too.

Comments should be sent to [log in to unmask]


The updated table will be based on comments received from this group.

I would like this information as soon as possible so an up-dated table can be circulated along with other changes to the general IPC membership before the spring meeting at APEX this spring.

Thanks in advance for your cooperation,

Dave Scheiner
Northrop Grumman - Kester

Table 3-1 Particle Size Distributions of Standard Solder Powders

                        Percentages of powder by weight 	
Powder                                  	
Size    Less than 0.005%        Less than 1%                    Less than
10%	
Symbol  larger than     larger than     At least 80% between    At least 90%
between smaller than	
1       180 µm [7.09 mil]     150 µm [5.91 mil]     150-75 µm [5.91-2.95
mil]    -       20 µm [0.79 mil]	
2       90 µm [3.54 mil]      75 µm [2.95 mil]      75-45 µm [2.95-1.77
mil]    -       20 µm [0.79 mil]	
3       53 µm [2.09 mil]      45 µm [1.77 mil]      45-25 µm [1.77-0.98
mil]    -       20 µm [0.79 mil]	
4       45 µm [1.77 mil]      38 µm [1.50 mil]      -       38-20 µm
[1.50-0.79 mil] 20 µm [0.79 mil]	
5       32 µm [1.26 mil]      25 µm [0.98 mil]      -       25-15 µm
[0.98-0.59 mil] 15 µm [0.59 mil]	
6       25 µm [0.98 mil]      15 µm [0.59 mil]      -       15-5 µm
[0.59-0.20 mil] 5 µm [0.20 mil]	

Note: Types 5 and 6 are shown as general industry accepted size ranges for development purposes. Current listed methods for measuring these particle sizes may not be accurate enough for exact size and range distribution.

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