Sanitary and physical properties of rubber rings
The rubber ring used in water pipes for drinking shall be made of food-grade rubber, and its sanitary index shall meet the hygienic index of Rubber Products for Food GB4806-94.
Rubber rings shall not have air holes, cracks, heavy skins and joints. Its physical properties are as follows:
Shaw hardness 45-55 degrees
Tensile strength ≥16MPa
Elongation ≥ 500%
Permanent deformation < 20%
Aging coefficient >0.8 (70℃, 144h)
