Definition of diastereomer. : a stereoisomer of a compound having two or more chiral centers that is not a mirror image of another stereoisomer of the same compound â compare enantiomer.
Most perennial weeds such as Johnsongrass. are also suppressed although vigorous plants or heavy in-. festations may lift plastic. Perennial sedges, and to a lesser. extent, grasses can puncture sheet mulches as the weeds. emerge from the soil, resulting in inadequate control.
Types of Flexible Plastic Tubing. Although we consider all of our plastic tubes to be flexible (more flexible than pipe), flexibility can be subjective. Polyurethane and PVC are the most flexible plastic tubing we produce.Polyurethane is also very abuse resistant and can withstand higher pressures when compared to PVC.We offer 4 different durometers (hardness) of Polyurethane exhibiting different characteristics.lastic Tubing & Flexible Tubing Products. Freelin-Wade_Catalog.pdf. This website describes in-stock plastic tubing, flexible tubing, hoses, pneumatic tubing, and accessories which can be ordered direct and ships the next day.