If one or more of the following items appear during the ozone aging test of rubber products in the ozone aging test chamber, it is sufficient to indicate that they have undergone aging. There are also many different classifications of rubber, so the varieties, storage, or use may vary, resulting in different aging phenomena. Rubber aging is diverse and varied. But the overall judgment is based on the following five aspects.
Electrical performance changes: changes in insulation resistance, dielectric loss, conductivity, breakdown voltage, dielectric constant, etc;
Changes in mechanical properties: changes in tensile stress, tensile strength, elongation, deformation, flexural fatigue strength, tear strength, hardness, wear resistance, elasticity, etc;
Appearance changes: brittle, blistering, loss of gloss, discoloration, stickiness, cracking, mold growth, hardening, powdering, delamination, and other phenomena;
Changes in physical and chemical properties: changes in cold resistance, solubility, density, swelling rate, gel weight, molecular weight, reaction products, medium resistance, heat resistance, permeability resistance, etc;
Other performance changes: such as changes in optical performance such as light transmission, reflection, and absorption, as well as changes in acoustic performance such as sound transmission, reflection, and absorption, as well as changes in magnetic permeability.
There are many forms of situations that arise, and handling related issues will also be resolved as different situations arise. For the issue of ozone aging resistance of rubber, it is necessary to search for corresponding problems and solve them in the above changes. During the testing process, the existence of problems should be discovered in a timely manner, and corresponding solutions should be found to obtain results in a more timely manner.