31-07-2025
Closure Systems International Launches Defender-Lok™ CRC Product Line
INDIANAPOLIS--(BUSINESS WIRE)--Closure Systems International (CSI), a global leader in closure design and manufacturing, announces the launch of its new child-resistant closure (CRC) platform: Defender-Lok™. Engineered for OTC and nutraceutical applications, Defender-Lok delivers certified safety, operational efficiency, and sustainability in a drop-in, high-performance solution.
Built for Line Efficiency and Compliance
Defender-Lok is designed to integrate seamlessly into existing capping and filling lines—minimizing downtime, feeder jams, and sealing failures. The result: optimized production, simplified validation, and consistent throughput. The closures are certified child-resistant and senior-friendly, offering peace of mind to both manufacturers and consumers.
'In the OTC and nutraceutical market, child-resistant closures demonstrate a brand's commitment to consumer safety and regulatory compliance. A well-engineered design meets the expectations of today's health-conscious shoppers, ensures compliance, and integrates seamlessly with high-speed filling and capping lines,' said Chuck Newswanger, Director, Global Commercial Innovation and Technical Development–Pharmaceutical Packaging at CSI.
Key features of Defender-Lok include:
Certified CRC Design – Child-resistant and senior-friendly, meeting regulatory standards
Drop-In Compatibility – Ready for existing OTC/nutraceutical lines
Sustainable Engineering – Up to 33% lighter than conventional CRCs; supports PolyCycle™ PCR resin integration
Tamper-Evident & Liner Agnostic – Compatible with all liners including foam, tri-foil, induction seal, pressure-sensitive, and custom
High-Speed Performance – Maintains line speed, reduces errors, and improves yield
Flexible Formats – Available in 33mm, 38mm, 45mm, and 53mm sizes; suitable for dry or liquid products
Sustainability by Design
With growing Extended Producer Responsibility (EPR) requirements and state-level mandates like California's SB-54, sustainability is no longer optional. Defender-Lok is designed for material minimization—reducing resin use, shipping weight, and overall environmental impact. Select SKUs already exceed 2027 SB-54 targets, and all closures in the line can be produced using CSI's PolyCycle™ PCR resin, which is made from post-consumer content and fully recyclable.
Backed by Global Scale and Technical Expertise
CSI brings more than 90 years of experience and operates nine manufacturing sites across the U.S., Mexico, Costa Rica, China, and Japan. All CRC products, including Defender-Lok, are manufactured in FSSC-22000 certified facilities with in-house tooling and R&D support. CSI also offers customers full application assistance, including on-site technical service, validation audits, and commercialization support.
Defend Product Integrity – Lok In Performance
To learn more about the Defender-Lok CRC line or to speak with CSI's technical packaging team, visit:
About Closure Systems International
Closure Systems International (CSI) is a global leader in closure design, manufacturing, and innovation. CSI supplies billions of closures annually across the beverage, food, household, and healthcare sectors. Learn more at
