... rate4. Anti-aging and fire blocking5. Shock reisitance, sound absorbing, pressure relief5. Acid and alkali resisting, environment-friendly6. Beautifual apperance, easy ... 56259-1996Slightly crumpling, no cracks,no pin holes, not deforming.Specification for Foam Roller Method of inspectionNational standard(GB8624-1997)Enterprise Execution ...