Puncture Strength

Puncture Strength is a physical indicator of a packaging material's (such as cardboard, corrugated boxes, plastic films, etc.) ability to resist penetration by sharp objects, typically expressed in joules (J) or foot-pounds (ft·lb). In foreign trade, this term commonly appears in packaging requirements, quality inspection clauses, and transportation safety standards, especially for goods easily damaged by sharp objects (e.g., electronics, precision instruments). Usage scenarios include: packaging specifications in contracts, inspection certificates under letters of credit, and claim basis for transportation insurance. Note: Different national or industry standards (e.g., ISO, ASTM, TAPPI) have different test methods, and results are not directly comparable; the test standard, specimen condition, and sampling method must be specified. Difference from 'Bursting Strength': the latter applies uniform pressure until rupture, while puncture strength simulates impact by a sharp object; difference from 'Compression Strength': the latter addresses stacking pressure. Foreign trade practitioners should specify the exact test standard and value in contracts to avoid disputes caused by standard differences.