Licensed to About.com, Inc. Definition: Moleskine is a brand of notebook that comes in various formats, sizes, and papers. The covers are usually black leather (some special editions have silk, for instance, and diaries come in red) and there is an elastic band for keeping it closed.
3-3-4 Viscosity Stability of the aqueous solution The viscosity of PVA(Polyvinyl Alcohol) aqueous solution for fully hydrolyzed grades increases, according to storage time, and a gelation occurs.
Polyvinyl chloride, also known as PVC or vinyl, is arguably one of the most toxic types of plastic in our lives. One reason why PVC is so toxic is that it is often mixed with softening chemicals called plasticizers, the most well known variety being phalates.