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.
uPVC actually stands for unplasticised polyvinyl chloride. uPVC is also commonly known as rigid PVC and it is called this because it is hard and does not flex. This material d â¦ oesn't not contain any phthalates or BPA, so it is actually quite safe.