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Palmer Foundry in Palmer, MA does leak proof Al castings for the semiconductor industry. We are in the process of switching casting over to them to eliminate a void issue on Al 356. Check with them. 413 283-2976, Bob logan owner. Bob Pajak

My problem with samples being cut from the castings themselves is that the casting walls are barely able to allow .125"DIA samples and that , for samples this small , we expect large variations in elongation. Is there a recommended averaging technique over some minimum number of samples?

When taking samples by cutting from a casting, is there any standard that recommends minumum number of samples or an averaging technique, since I see large variations from sample to sample.