One of the ways to know if a gas cylinder bottle is substandard is through the coating, the body painting. Most gas cylinder bottles painting are not unique enough; they looks like something that have been refurbished. Even the info stamped on the neck ring top are not perfectly imprinted. You have to be extra careful when purchasing your gas cylinder bottles at the market, as some of them a substandard, using popular brand names as cover-ups. They are rather REFURBISHED.
Checking the color spray can help you identify a substandard gas cylinder bottle. Some gas cylinders color looks blur, dull and basically too deep, like normal home-used paint. If the spraying of a gas cylinder looks blur, it loses color with time, and becomes less sharp. Original gas cylinder bottles tend to be shinning, cellos sprayed and harder to scratch just like one used for cars, not one used for spraying objects like local irons.
Another trick to identify a substandard gas cylinder bottle is for you to check for the details of the gas cylinder, stamped on the body, mainly at the top neck ring. Original gas cylinder bottles tend to be imprinted with the aid of machines from the factory, not hand writing.
You can use a digital scale to also determine if the details stamped on the gas cylinder bottle neck ring is corresponding with the empty (Tare) weight reading on the digital scale. Original gas cylinder bottles from authentic factories and manufacturers passes through quality control check. A 6kg gas cylinder bottle will always scale 6kg in quality control check point, minus the dimensions of the gas cylinder.
NOTE: Older version of gas cylinder bottles tend to be heavier than recent versions.
You should always go for trusted distributors. For authentic factories, any gas cylinder bottles that failed the quality control check, are usually removed, recycled to meet correct quality expectant. Substandard gas cylinder bottles, however, tend to have ridiculous high value than the info stamped on its neck ring.
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LPG Gas Cylinders