Natralock® SBS

Appealing. Safe. Functional. Sustainable.

Now there is a secure, tear-resistant, more sustainable alternative to traditional blister seal and clamshell applications. Natralock® SBS 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 SBS ideal for high-speed converting, filling and sealing applications. It’s perfect for promotional messages, graphics and compliance information for trade seal blister packaging and is uniquely engineered to be used as a clamshell replacement that both deters theft and enhances sustainability.

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Features and Benefits

What you can expect from us:

Laminated Structure

The rigidity of paperboard and the tear-resistance of lamination for unsurpassed assembly performance of trap seal blister packaging. Consistently seals to a wide variety of thermoformed blister materials, including APET, RPET, PETG, RPETG, PVC and PLA.

Heat Seal Compatibility

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.

Product Uniformity

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.

Converting Efficiency

Direct printing eliminates the need to apply heat-seal coating, improving converting efficiency and reducing inventory costs.


Best used with:

  • Healthcare
  • Beauty and Personal Care
  • Media and Electronics
  • Toys
  • Sporting Goods
  • Automotive
  • Home Improvement
  • Tools

Paperboard Calculator

We understand that you rely on us for more than paperboard. In order to provide the best service possible, WestRock has developed roll, sheet and metric conversion calculators to make your job easier.

View the paperboard calculator

A clear choice for better security

To help boost security and remove barriers to purchase, we offer Natralock® tear-resistant packaging. As durable and secure as clamshells, Natralock provides superior product visibility and a safer, easier opening experience to help drive sales and profits.

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How can we help you meet your business goals? Contact a member of our team to learn more about our paperboard products and services.

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