[China Glass Net] The front windshield of the car is blurred, and a spray of glass water is immediately lit up. However, be careful when buying glass water, those who fail will "pit" your car. Yesterday, the Jiangsu Provincial Quality Supervision Bureau released the sampling of glass water for vehicles. A total of 116 batches of glass water for vehicles were tested. 90 batches were rejected, and the unqualified rate was as high as 77.6%. Unqualified projects are mainly concentrated in metal corrosive projects, freezing point projects, pH projects and marking projects. It is worth noting that if too much metal corrosion inhibitor is added to the glass water, it will corrode the car surface and make your car surface pitted.
Inferior glass water, really hurts the car
If the metal is not corrosive, it will cause pitting on the surface of the car.
The sampling inspection showed that the metal corrosion rate of glass water for vehicles was low, and 120 batches were sampled. 116 batches were tested. Only 34 batches were qualified, and the pass rate was only 29.3%.
Ding Ning, director of the Energy and Chemical Industry Department of Xuzhou Product Quality Supervision and Inspection Center, said that the metal corrosion project has strict requirements on product formulation. Inferior glass water is corrosive to metal due to poor production equipment, rough process, poor raw materials, no metal corrosion inhibitor or excessive metal corrosion inhibitor. Or rough.
“When this sample was tested for corrosive quality changes in metal, one of the glass waters exceeded the standard by 6.3 times. The corrosion of the metal exceeded the standard, which caused pit corrosion and roughness on the surface of the car.†Ding Ning said.
Antifreeze requirements are not up to standard and may damage the water spray motor
In order to prevent freezing and dissolve the frost quickly, the vehicle glass water generally adds a refrigerant such as ethanol, ethylene glycol or methanol to reduce the freezing point of the solution. According to the national standard, the freezing point of glass water for ordinary vehicles should be less than or equal to 0 °C, and the freezing point of glass water for low temperature vehicles should be less than or equal to -20 °C. However, the sampling inspection found that there are still many products in the market where the glass water freezing point is not reliable. Among the 116 batches tested, the freezing point project failed to be 21 batches, and the failure rate reached 18.1%.
"Unqualified inferior antifreeze glass water is mainly blended with detergent, low-cost methanol and pigment, and the cost is very low. This glass water has a bad antifreeze effect, and the whole glass of water will freeze when it encounters cold weather. The problem is that the tank is cracked, the water pump is faulty, etc. If the driver does not know that the glass water has been frozen, and the water spray rod is continuously pulled to try to use the glass water, the water spray motor may be burnt. If the freezing point is high, When used at low temperatures, the sprayed glass water instantly forms a layer of crystal on the glass of the car, which seriously jeopardizes the safety of driving.†Ding Ning, for example, said that there were individual samples in the sampling test, “the table is not the sameâ€, and the label marked freezing point was -45. °C, the actual detection freezing point is only 0 °C.
If the pH is too high, the windshield will be scratched.
"The pH value of high-quality glass water should be neutral or weak acid-alkaline, free of various metal ions, rich in organic matter, can remove major stains, and has no corrosive effect on automotive paint, rubber, plastic and various metals. Or slightly corrosive." Ding Ning said that this sampling found that individual companies use inferior detergents and surfactants as raw materials, resulting in low or high pH values. "In such a case, it is easy to cause the corrosion of the product to be enhanced, and it will have certain corrosiveness to rubber, metal and paint film, accelerate the hardening of the catalytic wiper strip, and the hardened strip will scrape the windshield. Accelerate the surface of the windshield from being scratched and scratched." In this sample, the sample with unqualified pH accounted for 7.8%.
Jiangsu's pass rate is only 18.8%, lower than the national overall level
The sampling also showed that the overall quality of glass water produced by Jiangsu enterprises was not high, and the pass rate was only 18.8%. There is still a certain distance from the national average pass rate of 22.4%. The reason for this phenomenon is mainly because the facilities of Jiangsu glass water production enterprises are not perfect, lacking necessary testing equipment and internal quality supervision mechanism, and enterprises use inferior chemical raw materials.
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