INDUSTRY COMPONENT

Backsheet

Backsheet is the protective rear layer of photovoltaic panels that provides electrical insulation, moisture resistance, and structural support.

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Component Specifications

Definition
The backsheet is a critical multilayer component located on the rear side of photovoltaic (PV) modules, serving as the primary barrier against environmental factors. It consists of polymer-based laminates (typically PET, PVF, or PVDF) with adhesive layers, providing dielectric strength exceeding 1000V, UV resistance, hydrolytic stability, and thermal endurance from -40°C to +85°C. Its primary functions include preventing moisture ingress, offering electrical insulation between solar cells and the external environment, and maintaining mechanical integrity against weathering stresses.
Working Principle
The backsheet operates on barrier protection principles through multilayer polymer construction. The outer layer provides UV and abrasion resistance, the core layer offers dielectric insulation and mechanical strength, and the adhesive layer ensures bonding to the EVA encapsulant. It functions by creating a hermetic seal that prevents water vapor transmission (typically <2 g/m²/day), while dissipating static electricity through conductive coatings to prevent potential-induced degradation (PID).
Materials
Multilayer polymer composites: Outer layer - PVF (Tedlar) or PVDF films (25-50μm); Core layer - PET (polyethylene terephthalate) 250-350μm; Adhesive layer - EVA or polyolefin-based bonding agents; Alternative materials include fluoropolymer-free designs using PET/PA/PET structures or co-extruded polyolefins meeting IEC 61215 standards.
Technical Parameters
  • Thickness 300-400 μm
  • Flame Rating UL94 V-0 compliant
  • Peel Strength >40 N/cm
  • UV Resistance >15 kWh/m² without degradation
  • Temperature Range -40°C to +120°C
  • Volume Resistivity >1×10¹⁴ Ω·cm
  • Dielectric Strength >15 kV/mm
  • Water Vapor Transmission Rate <2 g/m²/day
Standards
IEC 61215, IEC 61730, UL 1703, ISO 9001, DIN EN 50548

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Backsheet.

PV backsheet solar panel backsheet photovoltaic insulation layer Tedlar backsheet polymer backsheet IEC 61215 compliant moisture barrier electrical insulation Backsheet Backsheet in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Photovoltaic Panel

A semiconductor device that converts sunlight directly into electrical energy through the photovoltaic effect.

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Engineering Analysis

Risks & Mitigation
  • Delamination from encapsulant
  • Cracking due to thermal cycling
  • Moisture ingress leading to corrosion
  • UV degradation reducing dielectric strength
  • Electrical insulation failure
FMEA Triads
Trigger: Inadequate adhesive formulation
Failure: Layer delamination during thermal cycling
Mitigation: Implement cross-linked adhesive systems with peel strength >50 N/cm and conduct thermal cycling tests per IEC 61215
Trigger: PET core hydrolysis in humid environments
Failure: Reduced mechanical strength and electrical insulation
Mitigation: Use hydrolysis-resistant PET grades with stabilizers and maintain WVTR <1.5 g/m²/day through improved barrier layers
Trigger: UV absorber depletion
Failure: Surface cracking and reduced weather resistance
Mitigation: Incorporate hindered amine light stabilizers (HALS) and conduct 15 kWh/m² UV preconditioning tests

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thickness tolerance ±10%, dielectric strength tolerance -0%/+20%, dimensional stability <1.5% shrinkage at 150°C
Test Method
IEC 61215-2 for thermal cycling, damp heat, and UV testing; IEC 61730 for safety testing; ASTM D882 for tensile properties; ISO 15106 for water vapor transmission

Buyer Feedback

★★★★☆ 4.8 / 5.0 (17 reviews)

"The technical documentation for this Backsheet is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Electrical Equipment Manufacturing environments. No issues with the Backsheet so far."

"Testing the Backsheet now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the typical lifespan of a photovoltaic backsheet?

Quality backsheets are designed for 25+ years of service life, maintaining >80% of initial performance when exposed to standard environmental conditions per IEC 61215 accelerated testing protocols.

Can backsheets be recycled?

Most modern backsheets use recyclable PET cores, but multilayer structures require specialized separation processes. Emerging mono-material designs improve recyclability to support circular economy in PV industry.

What causes backsheet degradation?

Primary degradation mechanisms include UV-induced embrittlement, hydrolysis of PET layers in humid conditions, thermal cycling stress, and potential-induced degradation from electrical potential differences.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Auxiliary Contacts Backshell Body