Folding endurance is a direct measure of a paper's ability to withstand repeated folding and creasing without breaking. Burst strength indicates the paper's resistance to rupture when subjected to uniform pressure. While not directly measuring folding, good burst strength often correlates with stronger fibers that can also contribute to better folding properties. Opacity refers to the paper's ability to prevent light from passing through, which is important for print quality but less directly related to how well it folds and creases. Tear resistance measures the force required to tear a paper.