2006-08-25 16:44:37 · 3 answers · asked by yanix_123 1 in Science & Mathematics ➔ Chemistry
Expanding construction foam is used for sealing cracks in cinder block, carpentry, anywhere you need to close off any exposed hole or deformation.
It expands and hardens as it cures.
Great insulation properties and better for filling large gaps than caulk.
2006-08-25 16:49:40 · answer #1 · answered by J.D. 6 · 0⤊ 0⤋
Styrofoam is a trade name used by Dow Chemical. I am an electrician in a factory that makes Polystyrene foam dinnerware and Polystyrene cups. Styrene is the base for the products. It comes to us in pellet form and we heat it up in an extruder to make it a hot liquid. It is basically a hot plastic. We then inject it with an expanding agent that causes the polystyrene to expand or foam up. When it comes out of the extruder it is a semi-solid foam. It is then streached over a cooling apparatus and rolled out to a flat sheet. After proper aging, the sheet is punched out into plates, bowls, saucers, and clamshell containers (the ones with the fold over tops). Polystyrene that is not injected with the expanding agent is also made. This is the hard plastic containers you see in restaurants. It is also made into lids and covers. Oh, yeah, and nacho trays. Liquid styrene is about 340 degrees and up Fahrenheit. It's kind of hot.
2006-08-26 00:02:39 · answer #2 · answered by damndirtyape212 5 · 0⤊ 0⤋
Polystyrene (PS) is inert to biological samples. I use PS to neutralize the toxic effects of ZnSe optics in contact with biological samples. PS is soluble in toluene and can be cast as a thin film.
2006-08-26 01:52:51 · answer #3 · answered by d/dx+d/dy+d/dz 6 · 0⤊ 0⤋