Rubber and antifouling paint particles leach metals such as Zn an Cu in water, which were linked to environmental toxicity. Leaching experiments were done using 4 rubbers and 3 paints of size fractions 1-2 mm, 200-500 μm and 40-80 μm in miliQ water with agitation for 72 hours or longer at a low relative concentration of sample 0.52 mg/mL, and some additionally at 5.22 mg/mL to determine the influence of particle size, relative concentration, and duration of leaching on leaching rate. Digestion of rubber and paint was done to obtain info on total metal content, link it to total leaching, and estimate necessary time to leach 50% of containing Zn. Specific surface area of samples was calculated using data obtained from particle size validation microscopy, and used for correlation with the mass transfer rate of metals.