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[PEL] A brand name for a rigid corrugated plastic board sandwiched between two sheets of thin Plastic. Coroplast® is composed of a high-impact copolymer of Polypropylene and Polyethylene. The moisture repellent sheets are light, strong, and acid-free. Coroplast® boards are used for enclosures, frames, backing, and supports. Chemically, the sheet is inert, with a NIL pH factor. At regular temperatures most oils, solvents and water have no effect, allowing it to perform under adverse weather conditions or as a product component exposed to harsh chemicals. All Coroplast® twin-wall profile sheets can be modified with additives, including UV protection, anti-static, flame retardant and color.

Synonyms and Related Terms

Silmilar products: Polyflute



  • Enclosures and frames
  • Storage boxes and trays
  • Backing, lining and support

Personal Risks

Coroplast® is combustible and may release harmful toxins at temperatures of 600 degrees F.

See Coroplast® health and safety sheet [[1]]

Collection Risks

Some products may contain additive and coatings.

Physical and Chemical Properties

Sheets that are 4 mm thick will not burst on Mullen tester. May degrade in sunlight.

Melting Point 162.2
Density 90 g/cc

Working Properties

Coroplast® may be cut or scored with a utility knife and bent with heat. It also may accumulate a static charge.


Available in a variety of thicknesses ranging from 2-6 mm.

Resources and Citations

  • Rachael Perkins Arenstein, Lisa Goldberg, and Eugenie Milroy, ‘Support and Rehousing for Collection Storage’ In ‘Preventive Conservation: Collection Storage’ Lisa Elkin and Christopher A. Norris (eds.), Society for the Preservation of Natural History Collections, New York. 2019.
  • National Park System, Conserv O Gram, Number 8/2, 'Safe Plastic & Fabrics for Display & Storage': Link
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
  • Website address: