In grade 5, students determined the meaning of general academic and domain-specific words and phrases related to grade level subject matter. In grade 6, they also determine figurative, connotative, and technical meanings of words and phrases. In grade 7, they will continue to do the same, and they. will also analyze the impact of a specific word choice on meaning and tone.
Written by Anne Reagan. May 13, 2014. Polybutylene piping is a form of plastic resin and was commonly used for plumbing U.S. homes built between 1978 and 1995. Due to its inexpensive production cost and ability to withstand high water pressure, it was widely seen as a better, cheaper alternative to copper plumbing.
The piping is a form of plastic resin that was used extensively for water supply piping between the years of 1978 and 1995. Itâs estimated that 1 out of 5 homes had polybutylene piping installed within the years of manufacturing.ver time, polybutylene piping loses its strength and becomes brittle, sometimes even scaling or flaking. Micro-fractures result and the basic structural integrity of the system is reduced. Itâs believed that the oxidants in water, such as chlorine, are what cause polybutylene to break down and lose its resilience.