GRAS Screen 3 samples twenty four salts, encompassing pH 4-9 versus four low molecular weight Polyethylene glycols (300, 400, MME 550, & 600). GRAS Screen 3 is supplied in a 96 Deep Well block format and is compatible with robotic and multi-channel pipet liquid handling systems. GRAS Screen 3 is compatible with vapor diffusion, free interface diffusion, and microbatch crystallization methods. For research use only.