In recent years, China's environmental protection and governance efforts are self-evident. In view of the haze and other atmospheric pollution problems, various policieshave been carried out in the early years: car number limit peer, diesel vehicle exhaustsystem modification, etc.

　　What I want to say here is about the problem of urea liquid for car used in SCR systemfor tail gas modification.

　　Maybe in the past, car owners have had the experience of active counterfeiting - byrefitting SCR systems, or using tap water instead of urea liquid for car, etc. Time hasproved that these methods are unwise and will eventually lead to greater losses.

　　Nowadays, qualified urea liquid for car has become a hot commodity, because a largenumber of unqualified products have caused losses to the owners.

　　1.According to the national standard, the main content of urea liquid for car should be31.8%-33.2%. Density, refractive index and other parameters have a certain range. Theconcentration of unqualified urea liquid for car will exceed the range in the useprocess, which not only makes the protection of the environment empty talk, but alsomakes the locomotive itself unable to work normally because of the urea concentrationproblem, and the engine will increase because of the reduction of output power. Oilconsumption. In the long run, locomotive parts will be damaged, and it will take atleast several thousand pieces to repair or replace a small nozzle, and tens ofthousands of other parts.

　　2.The contents of insoluble substances and metal ions (e.g. calcium, iron, copper,zinc, chromium, nickel and aluminium) are strictly controlled by the national standardurea liquid for car. Among them, insoluble substances must be less than 20 mg/kg andother metal ions must be less than 0.2 mg/kg. Once insoluble substances or metal ionimpurities exceed the standard, they will adhere to the system, either discharged intodust and PM, or deposited directly on the pipeline, gradually corrode the system overtime until the ternary catalyst completely fails.

　　Here are some simple and easy ways to identify counterfeit urea liquid for car:

　　a.Look at the color. Lanbao urea liquid for car produced by CDchem is colorless andtransparent. It will not appear yellowing, whitening and turbidity. Urea liquid for carpurification, used to use three-stage crystallized urea as raw material, now theprocess upgrade is usually used resin crystallization method, its purity is more pure.The raw material for regular urea liquid for car should be industrial urea, notagricultural urea. If raw materials are not guaranteed, they may contain metal ions orother impurities in their components, and yellow or other colors and turbidity willoccur. It is these metal ions or impurities that will seriously affect the normaloperation and service life of SCR system.

　　b.Look at the barrel wall. The crystallization point of authentic urea liquid for caris between - 5°C and - 11°C, which can not be reached in most areas and seasons inChina. At room temperature, there is no case of crystallization in the use ofLanbaourea liquidfor car. Adblue crystallizes normally after droplet evaporation and atminus -5°. But barreled products are usually not easy to crystallize without seedentering. So it can be judged that it is unqualified product before the crystallizationpoint is reached.

　　c.Audit qualifications. When purchasing chemical products, one must examine the otherparty's production qualification and business license, etc. Regular manufacturersshould meet the requirements of country IV, country V or country VI. They will besubject to spot checks and inspections by the General Administration of QualitySupervision, Inspection and Quarantine. This qualified report will filter outsubstandard urea liquid for car.

　　d.View enterprise quality standards and factory inspection reports. Every batch ofproducts produced by all the factories of CDcehm will be inspected at the time ofleaving the factory, and then shipped after being qualified. So every batch of goodsyou can let the manufacturer produce the factory inspection report, which is the rightof consumers.