True and false urea

First, the true urea is white or yellowish white needle-like, shuttle-like or round granular crystal, tasteless, completely soluble in water, otherwise it is a fake urea.
The second is to take a small amount of sample into the lime water, the ammonia smell is not true, and the ammonia smell can be smelled by other fertilizers or nitrogen fertilizers with other substances.
The third is to ignite a few pieces of charcoal, or to burn iron or tiles with fire, and put a little urea on it to burn, white smoke, pungent ammonia smell, and quickly turn into water as true urea; When it is burning, it is slightly boiling, and it emits a "beep" sound, which indicates that ammonium sulfate is added, which is inferior; if it emits hydrochloric acid, it indicates that it is mixed with ammonia chloride; if it burns, it will have a slight flame. , in which ammonium nitrate is blended.
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DOOR SPECIFICATION:

1. Steel and Wood Security Door, from China professional door manufacturer
2. Certification: ISO9001, CE, SGS certification
3. Product size: 2050*850/960*70MM or CUSTOMIZE
4. Door leaf steel plate: 0.8MM
5. Frame steel plate: 1.5MM
6. 180 degree visible hinges/2PCS
7. Jinlei or Hooply common lock set
8. Two locks
9. 8MM HDF/natural wood veneer
10. With rock wool, with #14 handle
11. Stainless steel doorsill
12. High quality rubber seal
(Economy series&Std series)
13. Various colors and style are available
14. Customized sizes are accepted
15. Opening direction: Left/right, inward/outward (according to your market)
16. Accessories: Reinforced hinges, various locks, handles, peephole and doorbell up to your choice.
17. Packing: Inner-film and bubble, outer-strong carton
18. Payment terms: T/T(30%before production, the balance before loading ctnr), L/C
19. Shipping port: Ningbo
If you have specific parameters and requirements for our steel and wood security doors, customization is available

COMPANY INTRODUCTION:

Zhejiang Hongtuo lndustry Co., Ltd, is a professional manufacturer specializing in Steel-wood Armored Door, steel security door and interior door. More than 60000 square meters production area and700, 000 PCS Steel Wood Armored Door and steel security door annual output. The employee and workers is totally 800 more. Our products have got ISO9001, CE and SGS certification. Offering reliable products with competitive price and to satisfy each consumer is our pursuing goal.

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