Fluorinated narrow neck bottles By Nalgene®, type 2097. Made of HDPE. With PP screw cap. Excellent for storing and transporting aggressive chemicals. The fluorinated inner and outer surface reduces diffusion and penetration of solvents and enhances long-term storage with minimal evaporation loss. Extremely resistant to cracks and puncturing. Suitable for most acids and aggressive organic solvents. Leakproof.