Stretching length could reach to triple and don't fracture Products have no stain,no impurity It doen't colour fading under the condition of boiling water It doen's melt under the condition of 135 centigrade steam sterilization,don't fracture and don't adhesion Cell toxicity test is eligible Guineapig tardive and Contact test is eligible Intracutaneous stimulate test is eligible Barium sulphate content is 64.2%