... longitudinal drainage in the major technical indicators is SZR-A≥40, SZR-B≥50 and SZR-C≥80, which doubles that of the ... is 30% higher. 3. Standard Technical Indicators of the CompanyProjectSpecifications SZR-ASZR-A0SZR-BSZR-B0SZR-CMaterialCore beltModified polypropylene (random copolymerization of ...