Screw Caps

Screw Caps

Screw caps are threaded closures designed to seal containers such as bottles, vials, tubes, or jars. They are used across labs, manufacturing, and storage environments to ensure secure, leak-proof containment of liquids, powders, or samples. They come in various materials, liner types, and thread standards (e.g., GL45, GL18).

 Specifications:

• Materials:

  • Polypropylene (PP) – autoclavable, chemical-resistant, lightweight

  • Polyethylene (PE) – economical and flexible, not always autoclavable

  • Phenolic resin – high temperature and chemical resistance

  • Metal (aluminum/stainless) – for industrial/chemical use

• Sizes (thread types):

  • Standard thread types: GL25, GL32, GL45, GL80, or custom

  • Diameter ranges: 13 mm to 120+ mm

• Liner Options:

  • PTFE/Silicone – for aggressive chemicals or air-tight sealing

  • Polyethylene Foam – general-purpose seal

  • Rubber or Teflon-faced rubber – for analytical uses

• Colors: Often color-coded for identification

• Autoclavable: PP and some others, depending on material

🧪 Uses:

• Sealing laboratory bottles, tubes, vials

• Chemical storage in reagent or sample bottles

• Transporting liquids safely without leaks

• Preventing contamination of sterile samples or reagents

• Color-coded systems for reagent or sample differentiation

Features

• ✅ Threaded Design: Ensures secure, reusable seal

• ✅ Leak-Proof & Airtight: With compatible liners or gaskets

• ✅ Chemically Resistant: Available materials handle acids, solvents, bases

• ✅ Reusable: Most lab-grade screw caps are durable and autoclavable

• ✅ Variety of Sizes: Fits vials, bottles, and tubes of many volumes

• ✅ Optional Vented Caps: For sterile filtration or gas exchange

• ✅ Color-Coded Options: Simplifies identification and organization

• ✅ Wide-Mouth or Narrow Options: For easy pouring or precise control