Barrier Layer: Thickness Range 2-20 microns

Component Specifications

Definition

The barrier layer is a critical functional component in multi-layer co-extruded barrier films, engineered to provide selective permeability resistance against oxygen, water vapor, carbon dioxide, and volatile organic compounds. It maintains product shelf life, freshness, and integrity by creating a molecular barrier through specific polymer structures and additives.

Working Principle

Operates through molecular diffusion control, where the polymer matrix's crystalline structure, chain orientation, and additive chemistry create tortuous pathways that impede gas and vapor molecule movement. The barrier effectiveness is determined by factors like polymer density, polarity, and the presence of nanofillers or metallization.

Materials

Common materials include EVOH (ethylene vinyl alcohol), PVDC (polyvinylidene chloride), PA (polyamide/nylon), metallized PET or PP, aluminum foil laminates, and nanocomposite polymers. Thickness typically ranges from 2-20 microns depending on application requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Density	0.9-1.4 g/cm³
Thickness Range	2-20 microns
Tensile Strength	20-100 MPa
Elongation At Break	50-500%
Oxygen Transmission Rate	0.1-5 cc/m²/day at 23°C, 0% RH
Water Vapor Transmission Rate	0.1-2 g/m²/day at 38°C, 90% RH

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 15105, ISO 2556, DIN 53380, ASTM D3985, ASTM F1249

Parent Products

This component is used in the following industrial products

Multi-Layer Co-Extruded Barrier Film

This product is a high-performance plastic film manufactured using co-extrusion technology to combine multiple polymer layers into a single sheet.

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Engineering Analysis

Risks & Mitigation

Delamination between layers
Barrier property degradation over time
Moisture sensitivity (especially for EVOH)
Thermal degradation during processing
Incompatibility with adjacent layers

FMEA Triads

Trigger: Poor layer adhesion during co-extrusion
Failure: Delamination and loss of barrier integrity
Mitigation: Optimize tie-layer composition and processing parameters; implement inline adhesion testing

Trigger: Moisture absorption in hygroscopic materials
Failure: Reduced barrier performance and physical property degradation
Mitigation: Proper material drying before processing; use desiccant packaging; consider moisture-resistant alternatives

Trigger: Thermal degradation during processing
Failure: Formation of pinholes and reduced mechanical properties
Mitigation: Optimize temperature profiles; use thermal stabilizers; implement real-time thermal monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thickness tolerance: ±5%; Barrier property tolerance: ±10% of specified values

Test Method

ISO 15105 for gas transmission rates; ISO 2556 for water vapor transmission; ASTM D882 for mechanical properties

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Barrier Layer

Manufacturer profiles associated with Barrier Layer.

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Related Components

Sealant Layer

Sealant layer in multi-layer co-extruded barrier films for hermetic sealing and product protection.

Tie Layer

Tie layer is a bonding component in multi-layer co-extruded barrier films that ensures adhesion between incompatible polymer layers.

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

Frequently Asked Questions

What is the most common material for high-barrier applications?

EVOH (ethylene vinyl alcohol) is most common for high oxygen barrier applications due to its excellent gas barrier properties, especially at low humidity conditions.

How does thickness affect barrier performance?

Barrier performance generally improves with thickness, but follows a logarithmic relationship. Beyond optimal thickness (typically 5-15 microns), additional thickness provides diminishing returns while increasing material costs.

Can barrier layers be recycled?

Recyclability depends on material composition. Monolayer barriers like EVOH are more recyclable than mixed-material barriers. Recent developments include recyclable barrier solutions using compatible polymer systems.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Barrier Layer