Correct invoice weight

 Correct invoice weight (CIW): The weight of obtained after adding standard moisture regain to the oven dry weight is called correct invoice weight(CIW).

CIW=Standard Moisture Regain+Oven dry weight

Calculation of correct invoice weight

let,

C=Oven dry weight of the consignment.

D=Oven dry weight of sample(with or without cleaning)

S=Original weight of the sample

W= Weight of the consignment at the time of sampling.

Then,

For sample dried without cleaning

  C                    D

---------=----------

W                S 

                        D

OR, C=W x-------        ---------(1)

                         s

 For samples dried out after cleaning,

CIW:C x100+R/100

CIW:C x100+R₂+A₂+B₂/100