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GC Vial Screw Cap for Supply

Features of GC Vial Screw Caps When selecting GC vial screw caps, several key features should be considered: 1. Material Composition GC vial screw caps are typically made from materials such as pol...
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Features of GC Vial Screw Caps

When selecting GC vial screw caps, several key features should be considered:

1. Material Composition

GC vial screw caps are typically made from materials such as polypropylene (PP) or aluminum. Each material has its advantages:
  • Polypropylene (PP): Offers good chemical resistance and is suitable for a wide range of solvents. PP caps are durable and less prone to breakage.
  • Aluminum: Provides excellent sealing properties and is often used for high-temperature applications.

2. Septa Material

The septum is a crucial component that allows needle penetration while maintaining a seal. Common septum materials for GC vial screw caps include:
  • PTFE/Silicone: Offers good chemical resistance and sealing properties.
  • PTFE/Rubber: Provides excellent resealability and is suitable for multiple injections.
  • Pre-slit Septa: Reduce coring and extend septum life.

3. Cap Design

The design of the cap is critical for ensuring a secure seal and ease of use. Common designs include:
  • Open Top Caps: Allow for easy needle penetration and are often used with septa.
  • Closed Top Caps: Provide a more secure seal and are used when needle penetration is not required.
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