Difference between revisions of "Barrier material"

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== Description ==
 
== Description ==
  
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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%20resin|Nylon]] film to provide tear and corrosion resistance. Some plastics also work well as vapor barriers ([[polyvinylidene chloride]], [[polyester%20resin|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.  
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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%20resin|Nylon]] film to provide tear and corrosion resistance. Some plastics also work well as vapor barriers ([[polyvinylidene chloride]], [[polyester%20resin|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.  
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=== Barrier Films ===
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Single layer barrier films, such as used for short term applications include cling wrap (polyvinylidene) shrink wrap (polyethylene) and nylon (polyamide) films. Double-layer films made by thermoforming one material to another provide a better balance of impermeability to both moisture and oxygen, thus providing protection for longer durations. Multi-layer films provide the best protection and usually include combinations of the following: Ethylene-Vinyl alcohol (EVOH), aluminum foil, metallized polyester, nylon, and polyvinylidene chloride.  Polyethylene and/or polypropylene are often used to adhere layers together.  Some commercial brands form barrier films include:
  
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Examples of some barrier films include:
 
 
{| class="wikitable" style="vertical-align:bottom;"
 
{| class="wikitable" style="vertical-align:bottom;"
 
|- style="font-weight:bold; background-color:#FCE4D6;"
 
|- style="font-weight:bold; background-color:#FCE4D6;"
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! Oxygen transmission cc/m2 per 24 hours
 
! Oxygen transmission cc/m2 per 24 hours
 
|-
 
|-
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| Marvelseal 360
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| [[Marvelseal 360]]
 
| [[nylon]]\[[polyethylene]]\[[Aluminum foil]]\[[polyethylene]]\LLDPE
 
| [[nylon]]\[[polyethylene]]\[[Aluminum foil]]\[[polyethylene]]\LLDPE
 
| 5.2 Mils
 
| 5.2 Mils
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| [[polypropylene]]\[[polyethylene]]\[[Aluminum foil]]\[[polyethylene]]\LLDPE
 
| [[polypropylene]]\[[polyethylene]]\[[Aluminum foil]]\[[polyethylene]]\LLDPE
 
| 5.0 Mils
 
| 5.0 Mils
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| 0.009 gms/meter2 (0.0006 gms/1002 inches.) per 24hrs @ 90% RH, 100°F
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| 0.009 (90% RH, 100°F)
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| 0.009 cc/meter2 (0.0006 cc/1002 inches.) per 24 hrs @ 0 RH, 73°F  
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| 0.009 (0 RH, 73°F)
 
|-
 
|-
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| Aclar  
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| [[Aclar]] UltRx 6000
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| [[polyethylene]]\[[polychlorotrifluoroethylene|polychlorotrifluoroethylene]]\[[polyester]]\Polyethylene
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| [[polychlorotrifluoroethylene|polychlorotrifluoroethylene]]  
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| 4.5 Mils   
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| 6.0 Mils 
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| Thermoformable; clear or opaque options
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| 0.0047
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| 14 cc/m2/day
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| 27.9
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|-
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| Peralux
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| [[Polyvinyl chloride]]\Aclar
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| 6.0 Mils 
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| 0.03 (90% RH, 100°F)
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| 14.8
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|-
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| kp (Pentapharm)
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| [[polyvinyl chloride]] (PVC)\Aclar\PVdC\PVC
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| 3.0 Mils   
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| 0.35 (38°C 90%RH)
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| 0.18
 
|-
 
|-
 
| Filmpak 1193
 
| Filmpak 1193
 
| [[Polyester]]\[[polyethylene]]\[[Aclar]]\Polyethylene
 
| [[Polyester]]\[[polyethylene]]\[[Aclar]]\Polyethylene
 
| 4.9 Mils   
 
| 4.9 Mils   
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| 0.03 g/100in2 per 24hr @ 90% RH, 100°F
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| 0.03 (90% RH, 100°F)
 
| 0.05  
 
| 0.05  
 
|-
 
|-
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| ESCAL
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| [[Escal|ESCAL]]
 
| [[polypropylene]]\Silica deposited [[polyvinyl alcohol]]\ LLDPE
 
| [[polypropylene]]\Silica deposited [[polyvinyl alcohol]]\ LLDPE
 
| 114 microns
 
| 114 microns
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[[Category:Materials database]][[Category: MWG]][[Category: Sheet/Film, Composite]][[Category: Laminates]]
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[[Category:Materials database]][[Category: MWG]][[Category: Sheet/Film, Composite]][[Category: Laminates]][[Category: Comparisons]]

Latest revision as of 09:34, 10 November 2024

Description

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.

Barrier Films

Single layer barrier films, such as used for short term applications include cling wrap (polyvinylidene) shrink wrap (polyethylene) and nylon (polyamide) films. Double-layer films made by thermoforming one material to another provide a better balance of impermeability to both moisture and oxygen, thus providing protection for longer durations. Multi-layer films provide the best protection and usually include combinations of the following: Ethylene-Vinyl alcohol (EVOH), aluminum foil, metallized polyester, nylon, and polyvinylidene chloride. Polyethylene and/or polypropylene are often used to adhere layers together. Some commercial brands form 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
Peralux Polyvinyl chloride\Aclar 6.0 Mils 0.03 (90% RH, 100°F) 14.8
kp (Pentapharm) Polyvinyl chloride (PVC)\Aclar\PVdC\PVC 3.0 Mils 0.35 (38°C 90%RH) 0.18
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.)

Resources and Citations

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