Escal

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Escal Film roll, Image from Conservation By Design

Description

[CXD International] A transparent, moisture and oxygen barrier film originally developed for use with the Mitsubishi Revolutionary Preservation (RP) System. Escal is a multi-layer laminate that contains a ceramic-coated polyvinyl alcohol film with no plasticizers as the primary vapor barrier layer. This central layer is laminated with oriented polypropylene (OPP) for added strength and protection, the linear low-density polyethylene (LLDPE) is laminated to the exterior surfaces to provide excellent heat-sealing qualities. For more information on structured and heat-sealing characteristics, see Mcphail et al (2003).

Synonyms and Related Terms

Barrier film; Escal Neo Oxygen Barrier film

Applications

  • Storage and preservation of a variety of materials, especially those sensitive to moisture and oxidation.
  • Anoxic (low-oxygen level) enclosures for pest eradication

Personal Risks

Collection Risks

Physical and Chemical Properties

The mitigation rates of Escal are:

  • Moisture barrier: 0.01 gms/m²/day @ 25°C 60%RH
  • Oxygen barrier: 0.05 ml/m²d @ 25°C 60%RH

Working Properties

Escal can be unrolled and cut down to the desired length and sealed with a heat sealer. An Escal enclosure can be utilized with the Revolutionary Preservation (RP) System in two different ways:

  • RP Type A – Involves the use of both oxygen and moisture scavengers.
  • RP Type K – Involves only oxygen scavengers but is moisture neutral, in which moisture cannot be removed or introduced into the enclosure. (Mainly used to protect photographs, films and dyed products.) Link

Forms and Sizes

Available in single sheet rolls and double sheet rolls.

Resources and Citations

  • Materials Working Group: Submissions from January 2021.
  • Rio Lopez, contributed information, MWG group, 2020.
  • Mcphail David, Adrian Doyle, Eric Lam, "The heat sealing of Escal Barrier films", The Conservator, January 2003 27(1): 107-116 link
  • Collins, Chris. “Barrier Films.” The Natural History Museum, 1999. Link
  • Conservation by Design International, 2020. Link
  • Mitsubishi Gas Chemical America, Inc. “Revolutionary Preservation System.” 2020. Link