Plastic tent

Waterproof Finishes. Waterproofing results from coating a fabric and filling the pores with film-forming material such as varnish, mbber, nitroceUulose, wax, tar, or plastic. The materials may be appHed as hot melts, eg, waxes or some polymers, as solvent solutions, or as aqueous latexes. The continuity of the film provides the water resistance. Except for tents, tarpauHns, and covers, coated fabrics have been largely replaced by plastics, and by fabrics treated with water and oU repeUents that do not reduce permeabUity to air and water vapor. Eabrics are also commonly laminated to films, such that the total stmeture is waterproof (15), or in some cases water-resistant but breathable (16). 

One factor that has done a great deal to harm the reputation of plastics is that in many cases designers and engineers have, after deciding tentatively to try to introduce plastics, then lavishly copied the metal product it was to replace. Too much emphasis cannot be given to the general principle that plastics are to be used based on their behavior... 

Table 5 is based on the TNO study Chemical recycling of plastics waste (a.l). It gives a tentative comparison of the costs of the different treatment routes. 

Table 5 Tentative cost comparison of treatment of plastics waste (in /ton) ...

Dr. Mark s World War I exploits (including an escape from an enemy prisoner-of-war camp) read like a Hollywood film script. During World War II, he contributed to the Allied cause through development of plastic-coated tents, mildewproof fabrics, gasproof clothing, an amphibious truck, and the snow vehicle called the Weasel. ... 

In two weeks roots will start to develop. When they are about 1/2 to 1 inch long transplant to potting soil in a well-drained pot. Continue to cover with a clear glass jar or clear plastic bag to serve as a humidity tent until the plant appears vigorous. 

A tentative reservation exists about this work. As reported, in a communication, it as yet gives no explanation for the unexpected solubility of poly(r t-butyl isocyanide) in chloroform, nor does it describe a safeguard against the mutual solubility, i.e. plasticization, of polyisocyanides, which is a possibility between the non-crosslinked, otherwise insoluble support medium and the mobile solute. Yet, the rotation data is compelling. 

I.Asimov, "The World of Carbon , Abelard -Schumann, NY(1958) 49)ASTM Standards Including Tentatives Part 9 Plastics,... 

---