Product characterristics Ultra-light composite CNG tank (Type4) is developed with a new technology, the world-first liner employing high molecule nano technology. It acquired a number of patents from home and abroad. Ultra-light composite CNG tank (Type4) is 50% lighter than the existing metal type (Type2). Thus it is capable of improving not only fuel efficiency of compressed natural gas vehicles but its driving performance as well. Ultra-light composite CNG tank (Type4) can be used almost permanently for more than 15 years since no internal corrosion occurs during the repeated gas instillation and discharge processes by using a non-corrosive plastic liner - With leak free nozzle, ultra-light composite CNG tank is safe from gas leakage in any environment.By using high-tech carbon fiber composite material of excellent heat and fatigue-resistant - properties, it boasts excellent safety with no performance deterioration at all in any circumstances. Not only is it the lightest type among various composite high pressure tanks for automobile, it is very effective and economical. Due to the lowered tank weight, more passengers can ride on the vehicle as well as less fuel is used during driving. Since ultra-light composite CNG tank (Type4) can easily change its size, it can be applied to any vehicle types.