NatraLock® Ultra Seal
Appealing. Safe. Functional. Sustainable.Now there is a secure, tear-resistant, more sustainable alternative to traditional blister seal and clamshell applications. WestRock NatraLock® Ultra Seal features stellar graphic reproduction as well as protection from tampering while allowing heat and RF sealing on a wide range of thermoform blister materials. Uniformity and consistency from roll-to-roll and sheet-to-sheet make NatraLock Ultra Seal ideal for high-speed converting, filling, and sealing applications. It’s perfect for promotional messages, graphics, and compliance information for trade seal blister packaging. With SBS and CNK offerings, NatraLock Ultra Seal is uniquely engineered to be used as a clamshell replacement that both deters theft and enhances sustainability. Download product guide PDF
Features and Benefits
What you can expect from us:
The rigidity of paperboard and the tear-resistance of lamination combines for unsurpassed assembly performance of trap seal blister packaging
Heat Seal Compatibility
Consistently seals to a wide variety of thermoformed blister materials, including APET, RPET, PETG, RPETG, PVC, and PLA.
Low Temperature Seal
Low-temperature sealing yields increased line speed, minimized risk of product damage and reduced ink degradation. With a dwell time 20% less than other hot-seal coatings, you’ll see improved results and lower costs.
A smooth surface, outstanding ink holdout and best-in-class consistency combine for optimal printability. Polymer coat-weight uniformity provides improved efficiencies and maximum throughput on high-speed filling equipment.
Direct printing eliminates the need to apply heat-seal coating, improving converting efficiency and reducing inventory costs.
Roll-to-roll and sheet-to-sheet consistency makes NatraLock SBS ideal for high-speed converting, filling and sealing applications.
Recycled Fiber Content
CNK is produced with up to 15% recycled fiber, providing an option for meeting your corporate sustainability goals.
Best used with:
- Beauty and Personal Care
- Media and Electronics
- Sporting Goods
- Home Improvement
Additional Product Information
- Made with recycled fiber (CNK version.)
- All WestRock North American paperboard mills are certified to the SFI®, PEFC™, FSC™ Chain of Custody Standards.
- Contact your WestRock sales representative for certified fiber availability for this product.
Environmental & Product Safety
- Notices under US California Proposition 65 and the EU REACH regulation are not required.
- Elemental chlorine free (ECF) bleached fiber (SBS version).
- Meets heavy metal limits of the US Model Toxics in Packaging rules and Article 11 of EU Directive 94/62/EC.
This information is subject to change without notice.
- Produced at an ISO 9001 certified facility.