The results show that elastic material rubber is not fit for tri-branch tube which branch ratio is more than 1.The medium of olefin and graphite in 4:1 admixture is suitable.

• 结果表明，聚氨酯橡胶弹性材料不适合成形高径比大于1的支管，塑性传力介质中石蜡石墨以4:1混合时，三通管成形质量比较理想。