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How to judge the aging of rubber dam

The so-called aging refers to the comprehensive action and influence of internal and external factors during the processing, storage and use of polymer materials, causing damage to the composition and structure of the polymer material, causing the rubber dam to gradually lose its original excellent performance, and finally Loss of use value, this irreversible change, or permanent chemical change, is called “aging”. Due to the wide variety of polymer materials, different processing, storage and use conditions, the aging phenomena they exhibit are also diverse. In summary, their characteristics mainly include four aspects. 1. Appearance changes Appearance changes such as loss of gloss, discoloration, softening and stickiness, hardening and brittleness, powdering, cracking, deformation, mildew, etc. 2. Changes in mechanical properties Changes in mechanical properties such as tensile strength, elongation, impact resistance, bending resistance, flexural fatigue, elasticity, tearing, wear resistance and other properties decline to varying degrees. The longer the aging time, the more significant the change. 3. Changes in physical and chemical properties Changes in physical and chemical properties such as specific gravity, solubility, swelling, viscosity, heat resistance, cold resistance, corrosion resistance, air permeability, water permeability, etc. 4. Other performance changes Other performance changes such as electrical insulation resistance, dielectric constant, breakdown voltage, etc., as well as changes in optical or acoustic properties such as light transmission and sound absorption. Rubber dam bags are used in rivers. They are exposed to sunlight, water immersion, wind, rain and snow, and ozone attack all year round. Thermal oxidative aging and ozone aging will occur. Black substances (called chalking) will be deposited on the surface and spider silk will be produced. Net-like cracks (called cracks), swelling in volume, blistering and delamination, and aging of the canvas, such as mildew. The occurrence and development of aging is a process from the outside to the inside, from quantitative change to qualitative change. Rubber dam aging includes thermal oxygen aging, ozone aging, and other aging such as fatigue aging, catalytic oxidation aging of harmful metal ions, photooxidation aging and biological aging.

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Six anti-aging measures for rubber dam bags

Improve the water resistance of dam bag rubberUse more aging resistant materials and formulas, improve processing technology and dam bag mechanism measures. Improve the water resistance of dam bag rubberThe dam bag is immersed in water for a long time and is easily aging due to erosion. This shows that the water medium is a

How to judge the aging of rubber dam

The so-called aging refers to the comprehensive action and influence of internal and external factors during the processing, storage and use of polymer materials, causing damage to the composition and structure of the polymer material, causing the rubber dam to gradually lose its original excellent performance, and finally Loss of use value, this irreversible change,

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