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Caps and Closures

Understanding Screw Cap Threads

How to Choose the Best Cap for Your Usage

Thermoset or Phenolic (Bakelite) - These caps are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. They also provide the most consistent adherence to close dimensional tolerances. Ideal for pharmaceutical applications. Thermoset closures cannot be remelted after they are formed. Common resins include urea, phenolic, and melamine.

Metal - Metal caps offer the widest range of temperature tolerances and are very resistant to fracture from impact. Metal caps are great for industrial and food applications. A metal closure is manufactured from either steel (coated with anti-corrosive coating of either chromeplate or tinplate) or aluminum.

Polypropylene (Thermoplastic) - Polypropylene caps are known for good impact strength, cost effectiveness, and pliability. They can be remelted after they are formed.

  • 33-400 Black Phenolic Cap with Aluminum Foil Liner, Each
    Part #: QP-CAP-00206-EA

    $0.53
  • 28-400 Black Phenolic Cap with Pulp/Vinyl Liner, Each
    Part #: QP-CAP-00194-EA

    $0.43
  • 53-400 White Metal Cap, Pulp Polyethylene Lined, Each
    Part #: QP-CAP-00449-EA

    $1.00 $0.69
  • 38-400 Black Ribbed Phenolic Cap with Cone-Shaped Insert, Each
    Part #: QP-CAP-00224-EA

    $1.00 $0.77
  • 33-400 Black Phenolic Cap with Pulp/Vinyl Liner, Each
    Part #: QP-CAP-00209-EA

    $0.51
  • 58-400 Green Thermoset Screw Cap with F217 & PTFE Liner, Each
    Part #: QP-CAP-00074-EA

    $3.00 $2.81
  • 24-400 Black Ribbed Phenolic Cap with PolyCone Liner, each
    Part #: QP-CAP-00170-EA

    $0.49
  • 89-400 White Metal Cap, Plastisol Lined, Each
    Part #: QP-CAP-00420-EA

    $1.51
  • 58-400 White Metal Cap, Aluminum Foil Lined, Each
    Part #: QP-CAP-00451-EA

    $1.00 $0.91
  • 33-400 White Metal Cap, Pulp Polyethylene Lined, Each
    Part #: QP-CAP-00437-EA

    $0.43
  • 45-400 Black Phenolic Cap with Pulp/Vinyl Liner, Each
    Part #: QP-CAP-00255-EA

    $1.00 $0.65
  • 70mm (70-400) Black PP Heat Seal Lined Ribbed Cap, Each
    Part #: PKW-C070C4RPHSB

    $1.25
  • 20-400 Black Phenolic Unlined Hole Cap, Each
    Part #: QP-CAP-00330-EA

    $0.43