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Extruded Polystyrene Foam Board: Polystyrene Swollen with Methyl Chloride and Let Out below 130 °C
Extruded polystyrene foam is the blue insulation board. Dow's McIntire (US 2,450,436, 1948) found the way to big, even foam: soak polystyrene with methyl chloride under pressure, but let it out below 130 °C, well under methyl chloride's critical temperature of 143 °C. The gas boils off as the mass leaves the vessel, swelling it into small closed cells and chilling it fast enough to set. In his example the result was a stable log about 8 inches across, which is sawn into boards. Methyl chloride is a toxic, flammable gas: outdoors or with strong ventilation, respirator on.
The picture: the patent's drawing.
Juu
3 days
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.