Name and contrast four treatment methods for increasing the adhesive capability of a plastic surface
What will be an ideal response?
The surface can be treated with chemicals, plasma, flame, or corona. Chemical etching is not effective on all plastics and so its application is limited. Plasma is almost always effective, but plasma machines are expensive and some experimentation is needed to develop the correct gas and machine parameters to get optimal results. Both corona and flame are inexpensive and usually effective. Corona is somewhat faster than flame, but corona often etches the surface.
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____ are smaller roof members that actually support the roofing materials yet are themselves supported by other main rafters or trusses.
a. Struts b. Purlins c. End braces d. Eaves
Most nitrogen leaching to groundwater is in the form of ammonium
Indicate whether the statement is true or false
_____ rubber gloves are rated for applications up to 1,000V.