PEVA is a biodegradable, non-chlorinated vinyl which is commonly used in shower curtains, plastic wrap for food and sports padding. It is also called polyethylene vinyl acetate, or ethylene vinyl acetate.
PEVA is a safe alternative to using PVC shower curtains that can give off many volatile organic compounds which can be toxic, for the first month after removing it from its packaging. PEVA can also be used as a drug delivery device, when it is mixed with a drug and implanted, in order to slowly release the drug compound into the body in time. Top-of-the-line soccer cleats, boxing gloves, ski boots and bicycle saddles are also common uses of PEVA, too.Learn More
in construction, "formwork" refers to any mold that is subsequently filled with another material, such as concrete, to ensure accuracy and stability. A formwork consists of both horizontal and vertical braces as well as joints between each segment.Full Answer >
A footing for a poured concrete retaining wall is constructed by digging out a flat area on the ground, adding concrete forms to contain the material, placing rebar at appropriate places and finally mixing concrete before pouring into the form. A concrete footing is poured on either side of the bottom of a retaining wall to give stability to the structure.Full Answer >
The formula to calculate the weight of asphalt material in a given area is equal to the volume of the material multiplied by the density of the material. Generally, the volume is measured in cubic feet, and is calculated by multiplying the surface area by the thickness of the asphalt.Full Answer >
Some bacteria manufacture and absorb their own food, while others must consume substances like living organisms or decaying material through their cell walls. Bacteria break down food in a process called respiration, which for some strains of bacteria requires oxygen to complete.Full Answer >