Bursting Strength

Bursting Strength is a key physical performance indicator for packaging materials (such as corrugated cardboard, cartons, paper bags, etc.), referring to the maximum vertical pressure per unit area that the material can withstand, usually expressed in kilopascals (kPa) or pounds per square inch (psi). In foreign trade, this term is commonly used in quality inspection and contract agreements for paper products and the packaging industry, especially for export transport packaging. Customers often require a bursting strength test report (e.g., according to ISO 2759 or GB/T 6545 standards). Usage scenarios include: technical specifications in procurement contracts, inspection standards, testing certificates required by letters of credit, etc. Note: Bursting Strength is different from Edge Crush Test (ECT) and puncture resistance; the former reflects overall rupture resistance, while the latter focuses on edge compression or puncture resistance. Different test standards (e.g., TAPPI T810 vs ISO 2759) may yield different results, so explicit agreement is needed. Compared with Ring Crush Test (RCT), Bursting Strength focuses more on uniform surface pressure rather than edge compression. Foreign trade practitioners should ensure suppliers provide test data compliant with the importing country's standards to avoid returns or claims due to non-compliant indicators.