Dimethyl silicone oil has a shelf life. If it is stored properly, it can be used even if it has reached the shelf life. However, there is another situation, too much impurities in the air, dimethyl silicone oil may deteriorate if it is not stored properly. Even if it is not up to the shelf life, the product can not be used. How to detect the deterioration of dimethylsilicone oil?

1. Illumination method. On a sunny day, lift up the dimethylsilicone oil with a screwdriver at a 45 degree angle to the horizontal plane. Observe the condition of oil drop according to the sunlight. Under the light, it can be seen clearly that there is no wear debris in the oil, which is good and can continue to work. If there is too much debris, it should be replaced.

2. Oil drop trace method. Take a clean white filter test paper, drop oil several times on the filter test paper. After dimethylsilicone oil leaks, if there is black powder on the surface, if you touch it with your hand, it means that there are many impurities in the oil. If it is of good quality, there should be no powder, and it should be dry and smooth with your hand, and yellow traces.

3. Hand twisting. When the dimethylsilicone oil is twisted between the thumb and the index finger for repeated grinding, the hands with better quality feel lubricity, less wear debris and no friction. If the greater friction feeling such as sand grains between fingers is felt, it indicates that there are many impurities in the oil and can not be used again, so it should be replaced.

4. Oil flow observation method. Take two measuring cups, one of which is filled with dimethylsilicone oil to be inspected, and the other is empty on the table top. Lift the measuring cup full of oil 30-40 cm away from the table top and tilt it to let the oil flow slowly into the empty cup. Observe the flow situation. The good quality should be slender, uniform and continuous. If the oil flows fast and slowly, and sometimes large pieces flow down, it is said that it has deteriorated.

When dimethylsilicone oil deteriorates, if it is not replaced in time, it will accelerate the wear of parts and affect the service life, so the corresponding methods can be used for detection. Jiechen chemical also suggests that we should pay attention to the storage of dimethyl silicone oil to ensure the normal use of dimethyl silicone oil.