Screw Caps

Screw Caps

Description:

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