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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
  

September 30,

2018

  

December 31,

2017

 
Permit of land use  $410,203   $432,910 
Building   9,525,558    10,052,840 
Plant, machinery and equipment   26,600,697    28,044,515 
Motor vehicle   313,258    330,598 
Office equipment   194,898    200,974 
Total   37,044,614    39,061,837 
Less: accumulated depreciation   (16,987,979)   (15,520,834)
Property, plant and equipment, net  $20,056,635   $23,541,003 
Scedule of depreciation is computed on straight-line basis over estimated useful lives of assets
Asset  Life – years
Permit of land use  40 - 70
Building  20 - 49
Plant, machinery and equipment  5 - 10
Motor vehicle  5 - 10
Office equipment  3-5