CalpreneВ® 401 Thermoplastic rubber SBS dry CalpreneВ® 401 is an 80/20 Butadiene/Styrene Thermoplastic Copolymer, polymerized in solution and having a radial structure.    PresentaciГіn C-401   Porous crumb Main Applications Asphalt Modification (Paving and Roofing) and Compounding. Documents TDS   MSDS   Characteristics Property Unit Value Structure --- Radial Styrene % 20  Bookfield Viscosity cps 9 700 TSV cSt 18 Volatile matter % 0.5 Hardness  oShore A  60