Grade Inherent Viscosity "K" Value Bulk Density Application 1185B 0.68 57.0 0.53 Blow Molded Bottles, Injection Molded Fittings 1195B 0.73 58.0 0.53 Blow Molded Bottles, Injection Molded Fittings 1230P 0.89 65.0 0.56 Pipe, tube and conduit 1230S 0.90 65.0 0.56 Siding, window and door