The objective of this research is to do a comparative analysis between the Gram Per-square Meter (GSM) variance between the incoming White-opaque and White- opaque Special Polyethylene (Poly) rolls from the standard values of GSM for the respective rolls. With the help of literature and industrial survey a complete comparative data is collected. Each individual roll film was diagnosed and different readings were taken with the help of certain set of equipment which later were analyzed in order to plot GSM deviation graph. In this research it was found that White-opaque special showed a lesser deviation in GSM from standard than White-opaque film.