Heritage Corrugated Board is manufactured to the following specifications:
*100% bleached alpha cellulose
*Without the use of recycled or wooden fibers
*No optical brighteners
*Kappa level: 1 - 2 = lignin-free (TAPPI T 236 om-99)
*pH cold extraction: 8.0 - 9.5 (TAPPI T 509 om-02)
*Alkaline reserve (buffer) > 3% calcium carbonate
*Adhesive: Potato starch, ph 7.0, moisture proof.
Certification
ANSI IT 9.16 / ISO 14523-1999 (PAT test)
ISO 9706 - Permanency requirements for paper
ANSI / NISO Z.39.48-1992 Permanence for paper in Library and Archives
Maximum Strength. Archival First.
The Heritage Clamshell Max is our most robust clamshell enclosure to date — engineered for collections that demand superior structural protection without compromising archival integrity.
Built on the foundation of our trusted Heritage Clamshell Box, the Max version incorporates additional layers of B-flute corrugated board concealed within the upright walls and the floors of both the base and lid. This reinforced internal structure dramatically increases compression resistance, rigidity, and long-term durability, making it ideal for housing heavier, oversized, or high-value materials.
Designed as a practical alternative to a traditional Solander Case, the Heritage Clamshell Max prioritizes archival performance first and presentation second. While it offers a clean, professional appearance, its true purpose is protection — safeguarding books, prints, documents, portfolios, and artifacts from environmental stress, impact, and handling wear.
Key Features
The result is a box that delivers the protective integrity of a high-end case, while maintaining the archival standards professionals rely on.
All boxes are 2-½\" in depth and have an additional ½\" margin on each dimension to allow for comfortable storage of standard size materials. For example the 11\"x14\" box has inside dimensions of 11-½\" x 14-½\" x 2-½\"
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