High mechanical strength of natural rubber because it is self-reinforcing rubber, the time when the tensile stress will make the direction along the macromolecular chain to form crystal orientation.

• 天然橡胶手轮机械强度高的原因在于它是自补强橡胶手轮，当拉伸时会使大分子链沿应力方向取向形成结晶。