A foamable phenolic resin was prepared,through addition,condensation,in the presence of alkali.The resin was foamed with surfactant, foamer,solidifying agent , then the foam phenolplast was given .
Label CFC-11, the chemical in question used to be used in refrigerants, foam blowing agents, and aerosol sprays but it was supposed to be completely phased out in 2010.
That’s because the carbon dioxide in the beer forms bubbles that fluff up the batter, and foaming agents, which are certain proteins found in beer, keep those bubbles from bursting as fast as they normally would.
进行了探讨。
比例为4%
具有最
它还可以制造很好的推进剂，
于制冷剂、
沫
变得蓬松，而
