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Plastic Closures Explained: 10 Common Questions from Packaging Professionals

When it comes to caps and closures, no question is too basic — and no detail is too small. Whether you’re a brand manager or procurement specialist sourcing closures, or a seasoned bottler optimizing your line, zeroing in on the right specifications makes a real-world difference in product performance, operational efficiency, and consumer satisfaction.

Defender-Lok CRC 45mm

Next Generation CRC Performance

A 45mm certified child-resistant closure that installs directly onto existing OTC packaging lines without changes. Defender-Lok™ is lightweight and senior-friendly, making it ideal for pharmaceutical brands seeking compliant, efficient, and sustainable packaging. CSI offers more than just the closure:

  • Certified precision: Built for demanding requirements, CSI is clean-room capable with in-house tooling and FSSC-22000 certified manufacturing.
  • Application Support Validation: on-site technical service, line audits, and commercialization support.
  • Continuous Innovation: In-house R&D, certified labs, and dedicated CRC development ensure Defender-Lok outperforms legacy designs and meets evolving regulatory standards.
  • CSI Weight: 7.6g (down from 8.9g standard)
  • Suitable for dry and liquid products
  • Available with sustainable PolyCycle® PCR resin

Defender-Lok CRC 53mm

Next Generation CRC Performance

A next-generation 38mm CRC closure designed to meet the demands of OTC and wellness brands. Defender-Lok™ protects young users, supports senior usability, and keeps production lines running at full speed with no retooling.

  • Certified precision: Built for demanding requirements, CSI is clean-room capable with in-house tooling and FSSC-22000 certified manufacturing.
  • Application Support Validation: on-site technical service, line audits, and commercialization support.
  • Continuous Innovation: In-house R&D, certified labs, and dedicated CRC development ensure Defender-Lok outperforms legacy designs and meets evolving regulatory standards.
  • CSI Weight: 10.7g (down from 11.5g standard)
  • Suitable for dry and liquid products
  • Available with sustainable PolyCycle® PCR resin