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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment

 

  

December 31,

2018

  

December 31,

2017

 
Permit of land use  $409,612   $432,910 
Building   9,511,832    10,052,840 
Plant, machinery and equipment   26,576,409    28,044,515 
Motor vehicle   312,807    330,598 
Office equipment   198,292    200,974 
Total   37,008,952    39,061,837 
Less: accumulated depreciation   (17,714,573)   (15,520,834)
Property, plant and equipment, net  $19,294,379   $23,541,003 
Schedule 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