Water Resistance Test Of Pre-insulated Bushings

pre insulated sleeve has excellent properties such as high strength, heat resistance, oxidation resistance, corrosion resistance, heat insulation, insulation, sound absorption and low density. Glass fiber yarn itself is widely used as reinforcing material, thermal insulation material, electrical insulation material, filter material, sound absorption material, optical guide material, etc.
In recent years, with the continuous expansion of glass fiber products such as pre insulated junction sleeve, its application field has become more extensive. From laboratory data, it is known that when various acid, alkali and salt aqueous solutions react chemically with insulated joint sleeve, the first step is that water reacts with the surface of glass fiber first. Since the use environment of glass fiber casing inevitably has water or water vapor, the water resistance of the product is an important factor to be considered. Strict testing of the changes of glass fiber casing in water environment will definitely help guide the development and use of glass fiber casing products.
The water resistance test of fiberglass casing has been reported abroad. Usually, the water resistance test of fiberglass casing is to take a fixed volume of water and soak it for a certain period of time under the rated temperature environment. The data obtained is relatively simple. However, under normal conditions, the chemical reaction rate of fiberglass casing and water is very slow, which takes a long time, and the measured data is not obvious enough. Another method is to immerse the fiberglass casing in water in a fixed container and boil the water to speed up the reaction rate of the fiberglass casing and water. This method is fast and effective. However, a problem will inevitably arise. As the water temperature rises, the fiberglass casing first undergoes a hydrolysis reaction with boiling water, and a certain amount of weak alkaline ions are precipitated, and then a certain amount of alkaline corrosion occurs, which causes certain interference to the experimental data and makes the experimental data not rigorous enough.