Of course, width of the board is a significant factor in warpage but you also need to consider the following factors: 1. Board thickness 2. Array design (spacing, break-away locations) 3. Material of the board 4. Even distribution of copper layer 5. Number of layer (EVEN prefer) 6. Copper thickness (should be symetric) 7. Dielectric thickness (should be symetric) 8. Web design (Copper filled??) Thanks Michael Yuen ---------- From: TechNet-request To: TechNet Subject: Assy: max board width Date: Thursday, June 13, 1996 11:40AM We are considering changing our board size and are curious about how wide the boards can be to avoid warping in reflow. We plan on doing 1 and 2 reflows (mostly just one reflow) and we do not have support in the middle.