Plastic plugs are designed to protect different items, pipes, tubes, machinery and equipment from damage during storage, shipping or handling, and also from external elements like dust and dirt, moisture, grease and other contaminants. Plastic is the material of choice since it is cheap, lightweight and very easy to install. It is also resistant to heat, cold, water and a wide range of aggressive solvents, acids and gases. Since plastic is very ductile and malleable, it can be molded into a variety of designs. The domed design ensures that any water that falls on the plug slides off, while tabs and tamper-proof pulls ensure the safety and security of materials during storage and transportation.

Tapered design: These plugs can also be used as end caps for tubes and pipes or as finishing accessories. In normal usage, the manufacturers recommend that the plug size is slightly larger in diameter than the pipe or tube end that it is meant to plug. When vinyl plugs are used, they offer more flexibility and can be stretched across the tube or pipe for better grip or fit. Generally made of low density polyethylene and this prevents the entry of dirt, dust and moisture. Plastic material also does not corrode so this ensures protection during long periods of storage and shipment conditions.

Heavy-duty: plastic plugs have an additional sealing gasket or ring design for better grip and protection.

Wide-flange: This design is suitable when impact or load-bearing is required. The flange design ensures that the plug does not move by accident into the opposite part during shipping/handling.

Push-fit: Generally used in the automotive and engineering fields, these caps protect the exposed ends of studs and can be removed and replaced easily.

Threaded plugs: When there is a requirement to protect exposed pipe ends from dust, dirt and moisture, threaded plugs are ideal. They are used wherever firm closure and sealing are required as in pneumatic, automotive and hydraulic industries and the threaded tightening ensures that they don't get removed accidentally.

Gas-cylinder Valve: To ensure that leakage of gas does not take place, plastic plugs with a tamper-proof and tamper-evident tab are the best solution. These are removed only when required and also have provision for a label or check mark by the personnel in the factory to ensure complete safety. These valve plugs also have a vent flap that ensures that any excess build-up of gas pressure can be safely released.

All these varieties of plugs are available in different densities of plastic, plastic compounds like PVC, polyethylene, polypropylene, etc and can be easily molded to the appropriate specifications. Many manufacturers also offer customized plug designs based on specific requirements and these can be ordered either from the local retailer or from an on-line catalog supplied by the manufacturers.

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