Barrier material

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A material, such as plastic, paper or metal, that is impermeable to gas or liquid. Modern barrier materials 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 film to provide tear and corrosion resistance. Some plastics also work well as vapor barriers (Polyvinylidene chloride, Polyester, rigid Polyvinyl chloride, Polychlorotrifluoroethylene, Polyvinyl fluoride) while others are best for moisture (Polyvinyl chloride, Regenerated cellulose, Polyethylene, Polypropylene, Polymethyl methacrylate (Hatchfield 2002). Multiple materials are laminated for optimized barrier properties. For anoxia treatments, films with low oxygen permeability are best.

Examples of some barrier films include:

Tradenames Composition layers Thickness (mils) Water-vapor transmission gm/m2 per 24 hours Oxygen transmission cc/m2 per 24 hours
Marvelseal 360 Nylon\Polyethylene\Aluminum foil\Polyethylene\LLDPE 5.2 Mils 0.009 (90% RH, 100°F) 0.009 (@ 0 RH, 73°F)
Marvelseal 470 Polypropylene\Polyethylene\Aluminum foil\Polyethylene\LLDPE 5.0 Mils 0.009 (90% RH, 100°F) 0.009 (0 RH, 73°F)
Aclar UltRx 6000 Polychlorotrifluoroethylene 6.0 Mils 0.0047 27.9
Filmpak 1193 Polyester\Polyethylene\Aclar\Polyethylene 4.9 Mils 0.03 (90% RH, 100°F) 0.05
ESCAL Polypropylene\Silica deposited Polyvinyl alcohol\ LLDPE 114 microns 0.01 (25°C 60%RH) 0.05 (25°C 60%RH)
EVOH/nylon barrier film EVOH, Nylon 3.0 Mils 2.3 cc/m2 per 24hr.

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.)

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