The RTV foam silicone rubber was prepared with α,ω-silanol terminated polydimethylsilox-ane (107 silicone rubber ) , terminal vinylsiloxy blocked polydimethylsiloxane fluid , vinyl silicone fluid , fumed silica , inhibitor , platinum catalyst and foaming agent .The effects of the viscosity and content of vinyl end silicone fluid on the initial viscosity , time, foaming ratio, mechanical properties , hardness and hole mor-phology of the foam silicone rubber were investigated .Results showed that with increasing viscosity of the vinyl silicone fluid and its foaming rate , the pore sizes and framework became thinner .The initial viscosity of the rubber increased , the operating time shortened , and the hardness increased , thus its cell size became smaller and its tensile strength decreased at first then increased , while its elongation had no change .With the in-creased content of the vinyl silicone fluid , the foaming ratio decreased , and the cell sizes and framework be-came thinner at first , and then thicker .When 3~9 parts vinyl end silicone fluid with the viscosity of 8 000 mPa.s was added, the foam silicone rubber had good fluidity , higher foam ratio, smaller cell and better visco-elastic properties .%以α，ω-二羟基聚二甲基硅氧烷（107硅橡胶）、α，ω-二乙烯基聚二甲基硅氧烷（端乙烯基硅油）、含氢硅油、气相法白炭黑、抑制剂、发泡剂及催化剂为原料，制得双组分室温硫化（ RTV-2）泡沫硅橡胶。探讨了端乙烯基硅油黏度和用量对RTV-2泡沫硅橡胶的初始黏度、操作时间、发泡倍率、力学性能、硬度及外观形貌的影响。结果表明，随着端乙烯基硅油黏度的增加， RTV-2泡沫硅橡胶的发泡倍率增加，泡孔孔径及骨架变细，弹性更好，胶料的初始黏度增加、操作时间缩短、硬度增加、泡孔孔径逐渐变小，拉伸强度先降后增，伸长率变化不明显；且随着端乙烯基硅油用量的增加， RTV-2泡沫硅橡胶的发泡倍率减小，泡孔孔径及骨架会先细后粗。当加入3～9份8000 mPa· s的端乙烯基硅油时，可制得流动性好，操作时间长、发泡倍率高、泡孔孔径细及弹性好的泡沫硅橡胶。
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