20mm 24mm 28mm Black Ribbed Smooth Plastic Screw Cap Induction Sealing Gasket or Pressure Sensitive Sealing Gasket

Key Properties of PP Screw Caps

• Chemical Resistance: PP is highly inert and resistant to a wide range of chemicals, including strong acids and solvents, making it a top choice for lab applications and industrial chemical storage.

• Thermal Stability & Autoclavability: This is a standout feature. PP caps are temperature stable and can be autoclaved (sterilized with steam) at high temperatures. For instance, a GL 45 cap is stable from -40°C to +140°C and can be autoclaved at 140°C. This makes them essential for medical, pharmaceutical, and laboratory use where sterility is critical.

• Physical Toughness: PP is a tough plastic with good impact strength, offering a balance of durability and flexibility.

  Common Applications

  The unique properties of PP make it suitable for a wide variety of products and environments:

  Laboratory & Scientific: Used for sealing reagent bottles, chromatography vials, and other labware. Products like the GL 45 series or specific chromatography caps are common in this field

  Industrial Packaging: For storing and transporting chemicals, solvents, and high-purity substances

  Food & Pharmaceutical: Due to its heat resistance, it's suitable for hot-fill applications (up to 205°F/96°C) and is compliant with FDA regulations for food contact

  Consumer & Specialty Goods: Found in a range of products from cosmetics to packaging for powders and pastes

  Selecting the Right PP Screw Cap

  To choose the correct cap, you need to know three things:

  1. Neck Finish: The precise thread size and type of the container (e.g., 38-400, GL 45). This is non-negotiable for a proper fit.

  2. Application Requirements: Will it be autoclaved? Will it be in contact with aggressive solvents? Will it need to be pierced by a needle?

  3. Regulatory Needs: Do you require FDA food-contact approval, USP Class VI, or other

     I hope this information is helpful. If you can provide more details about your specific application (e.g., the bottle neck size, whether the cap needs to be pierced, or if it will be autoclaved), I may be able to provide more specific guidance.