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.
Regular PVC (polyvinyl chloride) is a common, strong but lightweight plastic used in construction. It is made softer and more flexible by the addition of plasticizers. If no plasticizers are added, it is known as uPVC (unplasticized polyvinyl chloride), rigid PVC, or vinyl siding in the U.S.dit Cost. It is very cheap to manufacture many PVC and uPVC products, which is why they are so ubiquitous in a wide variety of affordable products. PVC pipe can be bought by length or weight. The thicker the piping, the most expensive the pipe will be.