Cardboard is a stiff board made primarily from wood pulp fiber, often manufactured in corrugated form for strength and durability. In the framing industry, cardboard is most commonly used as a packaging material to protect picture frames during shipment in soft or hybrid packs, rather than as a conservation-grade material for the artwork itself.

Construction & Composition

Corrugated Cardboard: Features a fluted inner layer sandwiched between two flat liners, offering cushioning and rigidity.
Chipboard: A non-corrugated, thinner version made from compressed recycled paper pulp, often used as a backing layer in packaging.
Wood Pulp Base: The primary raw material is mechanically processed pulp from trees, making cardboard widely available and inexpensive.

Uses in Framing

Packaging: Cardboard sheets and boxes protect frames in transit by absorbing shock and resisting puncture.
Hybrid Pack Systems: Often combined with bubble wrap, foam sheeting, or corner protectors for additional security.
Separation Layers: Flat cardboard sheets may be placed between multiple frames in bulk shipments to prevent scratches.

Limitations

Non-Archival: Cardboard contains lignin and acidic components that can damage artwork if used inside the frame package.
Moisture Sensitivity: Easily warps or weakens when exposed to humidity or water.
Short-Term Use: Suitable for shipping and handling but not recommended for permanent storage or conservation.

Best Practices

Use cardboard exclusively for external packaging or temporary support, not for direct contact with valuable artwork.
For long-term backing or mounting, substitute with archival options like Mounting Board or Foam Board.
When shipping, reinforce corners and edges with additional protective materials.
Recycle or reuse cardboard packaging whenever possible for sustainable practice.

Alternatives

Coroplast - Lightweight corrugated plastic offering moisture resistance.
Mounting Board - Archival, acid-free board for mounting artwork.
Foam Board - Rigid, lightweight alternative for mounting or backing.
PVC Sheet - Durable plastic board with smooth surfaces for display and signage.

Cardboard