TAPPI T 818 cm-07 provides procedures for determining the ring crush strength of paperboard using a flexible-beam compression machine. The method covers apparatus requirements, specimen preparation, conditioning, testing, calculations, reporting, and precision considerations for evaluating machine-direction and cross-machine-direction results.
This 4-page PDF is intended for paperboard manufacturers, corrugated packaging producers, quality-control laboratories, and technical professionals conducting internal comparisons or assessing compression-related performance. The document identifies the method as a TAPPI Classical Method and discusses its relationship to related ring crush and edgewise compression procedures.
Application Scope: Testing paperboard and fiberboard used in corrugated packaging, manufacturing process control, product quality evaluation, and laboratory compression-strength comparisons.
