PETG (polyethylen terephthalate copolyester). Sterile with white PEHD screw cap. Inexpensive alternatives to glass media bottles. These heavy-walled durable, square PETG bottles are graduated to contain. Reduced permeability to CO2 / O2. Bottles and closures are radiation-sterilised and non-pyrogenic to eliminate costly washing, pyrogenation and autoclaving steps. Heat-shrink band around closure and neck provide a tamper-evident seal to assure sterility. Transparent. Leakproof.