What paper stock options are available for folded pieces that won't crack along the spine?

Cracking along a fold happens when the paper coating and fibers are bent without being prepared first. The fix is a combination of scoring and choosing the right weight of stock.

• Score before folding: a scored crease compresses the fibers so heavier stock folds cleanly instead of cracking.
• Use cover weights that fold well: 14pt and 16pt cover stocks fold crisply once scored.
• Coated and silk-laminated covers also hold up well to folding when scored properly.
• Test first: request paper samples so you can feel how a given stock behaves at the fold before ordering a full run.