IFJ_05-2020_lyondell_Fig1 Ken Norberg September 15, 2020 4 Views Figure 1. New PP grade for unprecedented comfort; the higher viscosity of the atactic polymer fraction results in higher nonwoven tensile strength and same performance at lower product weight. Figure 1. New PP grade for unprecedented comfort; the higher viscosity of the atactic polymer fraction results in higher nonwoven tensile strength and same performance at lower product weight.