Difference between revisions of "Barrier films"

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Revision as of 17:44, 16 January 2021

Description

A material, such as plastic, paper or metal, that is impermeable to gas or liquid. Modern barrier films are usually made from lightweight transparent plastic sheets whose goal is to reach the barrier properties of a metal or glass. Metal sheets, such as Aluminum foil have good barrier properties. They are often laminated with polyethylene and/or nylon to provide tear and corrosion resistance. Some plastics work well as vapor barriers (Polyvinylidene chloride, polyester, rigid Polyvinyl chloride, nylon, Polychlorotrifluoroethylene, Polyvinyl fluoride) while other are best for moisture (polyvinyl chloride, Regenerated cellulose, Polyethylene, Polypropylene, Polymethyl methacrylate (Hatchfield 2002). Multiple materials are laminated for optimized barrier properties. I these cases the center layer usually provides the vapor barrier covered with layers to provide strength and tear resistance. then often the outside contains low density polyethylene to provide a heat sealing capabilities.

Comparable values are as follows:

Tradenames Single layers (1 mil thick) Oxygen transmission Water vapor transmission
Ethylene-vinyl acetate (EVA) 0.8-2.8 ml/m²d 22-84 gms/m²/day
Oxyshield biaxial Nylon-6 18.6-39 ml/m²d
Low Density Polyethylene (LDPE) 7000-8500 ml/m²d 15-22 (11-28) gms/m²/day
High Density Polyethylene (HDPE) 2300-3100 ml/m²d 6 (2.9-7.2) gms/m²/day
Oriented Polypropylene (OPP) 1550-2500 ml/m²d 0.5 (5.2-13) gms/m²/day
Aclar-RX Poly(chlorotrifluoroethlene) (PCTFE) 62 0.16-0.4 gms/m²/day
Polyester (PET) 31-93 ml/m²d 4.0-39 gms/m²/day
Oriented Polystyrene (OPS) 4350-6200 ml/m²d 108-155 gms/m²/day
Teflon Poly tetrafluoroethylene 0.55 ml/m²d 1 gms/m²/day
Saran Polyvinylidene chloride (PVDC) 2.3-14 ml/m²d 1.5-3 gms/m²/day
Archipress; Cryovac Poly vinyl alcohol (EVOH) 0.08-0.19 ml/m²d 0.4-0.8 gms/m²/day
Cellophane 90 2740-6850 gms/m²/day
Tradename Laminated layers Oxygen transmission Water vapor transmission
Metallized OPET 0.16-1.7 ml/m²d
PVOH coated OPP 0.31 ml/m²d
Metallized biax Nylon-6 0.78 ml/m²d
PVDC coated OPET 4.7-7.8 ml/m²d 5 gms/m²/day
PVDC coated OPP 4.7-9.3 ml/m²d
PVDC coated biax Nylon-6 4.7-7.8 ml/m²d
Metallized OPP 19-160 ml/m²d
Hy-Bar LLDPE/EVOH 2 ml/m²d 1.5-3 gms/m²/day
Aclar PE/PET/PCTFE/PE 14 ml/m²d 0.028 gms/m²/day
Escal PE/OPP/EVOH/OPP/PE 0.05 ml/m²d 0.01 gms/m²/day
Cadpak PE/Nylon
EVOH/nylon 2.3 ml/m²d (3 mil thick)
Filmpak 1193 PET/PE/EVOH/PE 0.1 ml/m²d (1 mil thick) 0.45 gms/m²/day
MarvelSeal 360 PE/Nylon/Al foil/Nylon/PE 0.01 ml/m²d 0.009 gms/m²/day

Synonyms and Related Terms

barrier plastic; barrier film; barrier board; vapor barrier; vapour barrier; air barrier; air infiltration barrier; Marvelseal® 360; Marvelseal® 470; Aclar® [AlliedSignal]; Filmpak 1193; Film O-Rap [Bell Fibre]; ESCAL; EVOH/nylon; Sperrschichtmaterial (Deut.); matériau barrière (Fr.); barreira (Port.)

Resources and Citations

  • Collins, Chris. “Barrier Films.” The Natural History Museum, 1999. Link
  • P.Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002.
  • J.Burke, "Vapor Barrier Films" WAAC Newsletter, Vol 14, No. 2, 199, 13-17.
  • Boise Cascade Paper Group, The Paper Handbook, Boise Cascade, Portland OR, 1989
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 578
  • Conservation Support Systems, Catalog, 1997
  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988

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