(1) maximize the use of a simple, symmetrical shape, to avoid sectional change is too large, and a narrow groove, spherical, etc., to facilitate the molding and compaction, as shown in Fig 7.3.1.

(2) avoid localized thinner so loaded with powder compaction and to prevent cracks.

(3) avoid grooves and recessed holes in the sidewall, in order to facilitate compaction or reduction of I blocks.

(4) avoid increasing cross-sectional area along the compression direction, in order to facilitate compaction. The junction of each of the walls should be rounded or chamfered transition to avoid sharp corners, to facilitate compaction and to prevent mold or compacts to produce stress concentration.



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