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The Universal Account Number (UAN) is a 12-digit number allotted to employees who contribute to an EPF. A UAN is generated for each PF member by the EPFO. The UAN acts as an umbrella for the multiple Member IDs allotted to an individual by different establishments and remains the same throughout the lifetime of an employee.
Other grades are UAN 28, UAN 30 and UAN 18. The solutions are quite corrosive towards mild steel (up to 0.5 inches (1.3 cm) per year on C1010 steel) and are therefore generally equipped with a corrosion inhibitor to protect tanks, pipelines, nozzles, etc. Urea–ammonium nitrate solutions should not be combined with calcium ammonium nitrate ...