The urea solution for vehicles must not be used after the expiration date. The concentration of the expired urea solution for vehicles is already impure, and it is likely to have exceeded 32.5%. The content of biuret has also increased, which will reduce the reduction of nitrogen oxides. deal with. Under the correct storage method, the shelf life of urea for vehicles is as long as 2 years, so normally, it is difficult to use expired urea solution for vehicles.

If you are afraid that the purchase of urea solution for vehicles will expire, you can buy a small amount at a time. After all, the price of urea for vehicles is not cheap, so as to reduce waste. If a large amount of urea for vehicles is hoarded, even if it is a regular product, it will cause certain losses to the car owner after the shelf life expires due to some reasons. Therefore, we recommend that the purchase of urea solution for vehicles depends on the production date. Try to use products with a delivery date of less than half a year. If the delivery time exceeds 18 months, it is strongly recommended not to buy any more.

Vehicle urea is a pure but not very stable chemical, care should be taken when storing:

1. Required storage temperature: Car urea needs a storage temperature of about -5-25° to avoid light and high temperature. In summer, the urea solution for vehicles should be cooled. If you find that there is very irritating ammonia gas when you open the tank cover, you should stop using it. Urea for vehicles will crystallize at low temperature, and the volume will expand by about 7%, so do not fill it with urea solution, and keep the capacity at about 90%.

2. Vehicle urea has a shelf life: Best before 18 months after production day.

3. Storage containers and filling equipment are required: chemical reactions between urea and metals, such as long-term exposure to copper, iron, aluminum, etc., will lead to deterioration of urea in vehicles, thereby affecting the performance of the SCR system. When filling trucks with urea, special filling equipment is required.