Why use Clarifying agents for Polypropylene?

About Polypropylene Crystallinity

	Alpha phase This a-phase is the most stable and the most known. The crystals are monoclinic.
	Beta phase This phase is metastable and the crystals are pseudo-hexagonal b-phase is mainly found in block PP copolymers and can be generated by addition of specific nucleating agents. This form was discovered by Padden and Keith in 1953 and can be improved by crystallization between 130 and 132°C or by orientation with high shear or through addition of specific nucleating agents. Presence of beta-phase in PP homopolymer generally increases ductility in the finished parts. Maximum effect is observed at 65% of beta-phase.
	Gamma phase This phase is also metastable with triclinic crystals. This form is not very familiar but appears mainly in low molecular weight polypropylene by crystallization at very high pressure and very low cooling rate.