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.
  The plastic Poly Vinyl Chloride is commonly abbreviated to PVC. UPVC is Unplasticised Poly Vinyl Chloride and is a rigid form of PVC often used in the building industry â¦ as a low-maintenance material. 28 people found this useful.