The factories that produce the remaining one-third of the "extrusion" styrofoam, which uses CFCs as a foam, as early as two years ago--when CFC prices began to rise--began shifting over to the old method of using inexpensive natural gas, so that adjustment here has also been relatively smooth.
而另三分之一原本用氟氯碳化物為發泡劑的「押出式」保力龍工廠，則早在兩年前氟氯碳化物剛開始調高價錢時，就紛紛改回舊有的、價格低廉的瓦斯發泡，因此轉換也算順利。