Ozone & Plastics
Ozone Applications are increasing in India. Numerous instances have been noticed that applications are decided without due considerations to the materials of construction of pipes , containers etc .We provide below some information on the use of different type of plastics and Ozone’s effect on them.
Two group of plastics are discussed here ; Plastics termed as Thermoplastic materials and other group of plastics are the Thermosetting Plastics. They find numerous use in Industries and each type of plastics are used for different purposes dependent on the physical & chemical properties of each.
The effects of ozone on each of these materials will depend totally on the configuration of the polymers that make up the plastics. Crossed linked plastics such as poly polypropylene, poly- ethylene , poly- vinyl chloride and silicone or fluorine combined plastics are sufficiently impervious to ozone to enable their use in direct contact.
Most of the packaged water plants all over the world use plastics in some form or the other and the knowledge of each of these will help understand the likely effects with the use of ozone.
From a careful study of different kind of plastics , some forms of polymers are readily attacked by ozone and are not recommended , there are other forms that are quite resistant and take a longer time for effects of ozone. and others attacked immediately and not recommended.
Since most of the packaged water manufacturers prefer residual ozone, and they invariably use PET Bottles, Poly Carbonate Jars, PP Filters, that are all polymer materials , the question of whether they are safe with ozone is frequently asked. The effects of ozone in the long run could unzip some of these polymers to form by- products , Even though they are all dose, concentration and time related , we should never take this risk
For example poly-carbonate has been shown to be very resistant to UV and like water is classified as an universal solvent. Ozone can also be classified as an universal reactant- the only question is how much does it react. Through practical experience, it is very insignificant. For that matter , Ozone is also supposed to be Corrosive to Stainless Steel .But the corrosion is concentration and time related and therefore Stainless steel is regarded safe with the use of Ozone. In fact many ordinary plastics that give out smell (the popular PVC tank) can also be held suspicious, more than ozone which imparts no flavor to the water. The action of ozone on plastics also depends on whether Ozone is used as a gas or solution.. For example Nylon appears to break down faster when in contact with ozone-air mixture than ozone solution
Some care that could be observed while using ozone would include:
- Do not use ozone before cartridge filtration in packaged water process
- Do not store fresh ozonated water in PVC containers ( use ploy carbonate instead)
- Use CPVC /SS pipes preferably if water is being used for drinking.
- Store freshly ozonated drinking water in SS containers instead
- For prospective ozone users check for ozone reactions on MOC of containers/pipes before you use them.
Many of the reported ozone reactions on materials are time concentration related and many of the toxic effects have never been proven .
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Most experienced– OTSIL is the most experienced Ozone Company in India
Technical Expertise -OTSIL is backed by combined technical expertise of over 35 years backed by over 1000 working Installations all over India
Do Not waste ozone – We don’t waste Ozone – World Class Engineering ensures correct ozone requirement
Safe Designs -We provide safe ozone designs and installations with time tested reliable accessories . We do not compromise on safety and do not undertake projects that compromise safety
Reliable Systems -Provide reliable systems that work 365 X 24X 7 . No break downs ISO 9001-15000 certified
Allows FAT during ozone testing – You are safe and know what system will be delivered at site
Documentations -Complete documentations are provided to substantiate designs and selection of accessories , including test certificates and , safety manuals and training
Indizone Installations would pass any International safety Audit
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Ozone is a gas . So is Nitrogen, oxygen , Carbon dioxide , helium, Argon .But what is the difference between ozone and the other gases ? Other gases are prepared by air separation and they all can be stored in cylinders as they are very stable gases. When you can store the gases , they can be measured , especially because they are in the pure form . So using them is easier and measurable .
What about ozone ? Ozone is the only gas that is synthesized . Ozone gas does not occur naturally unlike other gases . Ozone gas is very unstable , cannot be stored and hence need to be produced and utilized in situ . Also Unlike other gases , ozone gas is never pure and does not exist alone. It carries with it oxygen gas /other gases . Hence you can not measure ozone separately like other gases . Hence you measure concentration only and use this is determine the ozone weight.
Here is the catch. since measurement of concentration of ozone is possible only with expensive analyzers , the industry is faced with a problem that is the root cause of process failures . Users of large ozone systems do not want to pay a little more for the analyzer and end up loosing the whole . Unscrupulous manufacturers thrive .
Recently there was an issue faced by a CEPT of a tannery effluent , which had the most experienced member in leather technology , failing to observe these precautions. They purchased and installed 15 Kg ozone system from a Mumbai ozone manufacturer ( that too 15 numbers , 1 Kg system) and found out that each of the 1 Kg system is producing just 200 grams . This is a government funded project . A little bit of awareness could have saved crores of investment . The loss was only to the end user organization ( tax payers money) and they nearly concluded another large order to the same supplier until awareness was forced onto them .
Lesson to be learnt : Don’t adopt modular systems. If you want 15 Kg , go for a 15 kg system. Always ensure you buy an ozone analyzer along with the ozone system and demand process guarantees . Buy ozone only from companies who are technology based and who have history of good world wide references . Get ozone specialists evaluate specifications
A Large ozone Generator with an Ozone Analyzer ( yellow instrument)
If you still consider economy as the only criteria , than no one is to be blamed except you .
Blogging for ozone awareness – Contact OTSIL for consultations, DPR for ozone projects , Technical evaluations etc. It could save you lots of money 9840149184