The plants would be tapped, that is, an incision made into the bark of the tree and the latex sap collected and refined into a usable rubber. Natural rubber is used extensively in many applications and products, as is synthetic rubber. Check out this new project on natural polymers.Below are the introduction & content of the Class 12 chemistry project on natural polymers. Chemistry investigatory projects for class 12 cbse free download. The purified form of natural rubber is the chemical polyisoprene, which can also be produced synthetically. Introduction: Natural rubber was originally derived from latex, a milky colloid found in the sap of some plants.

1. Va Chapter 30

Va Chapter 30

For the full recording: The importance of nonstructural components and nonbuilding structures to earthquake resiliency has been the focus of increasing emphasis in the code. Damage to nonstructural components and nonbuilding structures has figured prominently in the costs and recovery times associated with recent earthquakes. In response to feedback from SKGA seminar participants, this seminar has been developed to exclusively discuss the changes to the nonstructural components and nonbuilding structures provisions in ASCE 7-16, including: 1. Changes to the exemptions for small components. Revision of the exemptions for distribution systems. Clarification of the requirements for anchor overstrength and anchorage requirements for nonbuilding structures. Changes to the requirements for connection of exterior wall elements.