Cap plugs are used in a variety of industrial and domestic applications. They can be used to protect products, pipes and tubes, electronic and electrical equipments, etc during shipping, storage and handling. Additionally, they're also used in a variety of other applications like masking while painting, finishing, packaging, automotive part closing, to provide tamper-proofing or tamper-evidence, gas-cylinder closure with pressure release etc.

Plastics and plastic compounds are ideal for caps and plugs, since plastic is a hard-wearing material, can be easily molded into different shapes, is cheaper than other materials, hence bulk customization and production are possible. Additionally, plastic is resistant to rust, corrosion, moisture and is easy to clean. It is non-conductive and if manufactured for specific purposes, can be heat and cold resistant, resistant to many types of chemicals, acids and solvents and can also be used in sterile environments. However, it may not be suitable for applications in food and beverage industrial unless it is food-grade.

The different types of applications for plastic caps and plugs:

Hydraulic: Useful for protecting hoses/tubes/pipes during storage, shipping and handling, these caps and plugs protect threaded and non-threaded pipes, keeps ports and exits free of dirt, dust, grease etc, can be used in low-pressure testing environments, useful during paint-masking, and can also be used to prevent hose-bending in high-pressure environments.

Appliances: Finishing plugs for refrigerators, compressor valves, glides on furniture, blenders, toasters, juicers, etc.

Automotive: Engine/shaft train, ports, fuel-lines, etc can be capped with plastic caps/plugs. These prevent leakage and damage. Electrical caps are used as connector caps while a variety of plugs and caps are used in body finishing. Paint-masking caps are used in the paint-shop.

Aviation: Cap plugs protect expensive and delicate aircraft parts from contamination and damage due to dust, grease, debris and also temperature variations.

Building and construction: A variety of caps/plugs may be used to cover pipes, ducts, light fittings, electrical connections and sanitary fittings to protect them from damage or contamination. These are usually cheaper materials in easily removable designs.

Medical: Here caps/plugs are used as instrument guards, packaging and as protective devices for gas cylinders, connectors for different types of IV, nasal-feeding tubes, blood and fluids transport, etc. The material used in these is of very high quality and purity.

Pipe/Flange protection: These caps prevent damage to exposed pipe/tube ends which may be threaded, beveled etc. They also help to keep out dirt and debris while shipping, storage and handling. Vented caps allow pressure-release. Caps and plugs can also help to control and direct the flow of liquids in waste-management, water-supply or food and beverage industries and they may be appropriately manufactured for heavy duty applications.

Depending on your requirements, plastic caps and pipes can be bulk purchased from your local hardware store or ordered on-line directly from the manufacturers.

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