Fluorination
Since the introduction of plastic containers, the packaging industry has sought a solution to the problem of solvent permeation. This problem has also been addressed by automotive engineers as vehicle components, fuel tanks and systems are manufactured in plastics. An answer has been found in fluorination, a process that eliminates hydrocarbon permeation problems.The direct surface fluorination of polyethylene components results in a reduction in the permeation rates of gases such as oxygen, nitrogen, carbon dioxide, sulphur dioxide, C2H2 and halogenated hydrocarbons. The permeability rate of oxygen through treated PE is reduced to less than 0.5% of the original value. At the same time both the thermal stability and the chemical resistance to acids and alkalis are improved.
The fluorination process In the process the plastic products are treated with elemental fluorine under strictly controlled conditions of concentration, temperature, pressure and time. The result is a permanent fluorocarbon barrier on all surface areas of approx. 10 µ..
Impact of the fluorination
Waste regulations: The fluorination does not change the basic characteristics of polyethylene, therefor there are no consequences with respect to waste regulations, recycling or disposal.
Food contact: The process has no problem in treating containers within the confines of the FDA requirements. Numerous companies already use fluorinated containers for food substance packaging.
Conductive drums: Tests performed on fluorinated conductive drums show no difference with standard conductive drums. Adhesion: Most methods of printing on plastic containers are unaffected by the process so containers can be printed before or after being treated.
Applications
Products packed in fluorinated packaging include petrol additives, paints, diesel fuel additives, nail polish remover, insecticides, pine oil, herbicides, cleaning fluids, motor oil additives, fragrances, aloe vera products, beverage concentrates, 2-stroke motor oil, lacquers, hydraulic oil and enamels. This list is by no means complete. Many products that are presently stored or shipped in glass, metal or plastics other than HDPE or PP could use fluorinated containers.
