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.
It was not until the 1950s, when thermoplastic polyurethane polymers became available, that TPE became a commercial reality. During the 1960s styrene block copolymer became available, and in the 1970s a wide range of TPEs came on the scene. The worldwide usage of TPEs (680,000 tons/year in 1990) is growing at about nine percent per year.