Electromagnetic radiation (Electromagnetic Field, EMF) can be sourced from nature and manmade, such as a smartphone. EMF exposure to humans is increasing with the presence of smartphones. Paper waste that has biodegradable properties has potential as antiradiation. By mixing other additives such as starch, glycerol, and Polyvinyl Acetate (PVAc) can increase the tensile strength of Case Smartphone Antiradiation (CSAR). The anti-radiation properties of CSAR was calculated using dosimeters by comparing the anti-radiation properties of CSAR with other materials (aluminum foil, paper without aluminum foil, and softcase), various conditions (stand-by, dialing, and charging), and different distances/thickness (0 mm, 2 mm, 4 mm, and 6 mm). In charging conditions, EMF is larger than the stand by and dialing conditions. As increasing the thickness of CSAR, EMF exposure is also reduced.