That's because the restructuring of carbon-sulfur bonds that allows the material to heal also requires that material to be rubbery and soft.
因为只有有弹性和柔软的材料才能让其中的碳硫键重组。
2
The invention refers to a kind of soft metal, whose characters lie in it is made up of natural rubber, stearic acid, zinc oxide, sulfur, metal powder, accelerator and age-inhibiting additive.