A-25 Aluminum Foil / Polyester Film EMI-RFI Shielding Laminate
A-25 is an aluminum foil and polyester film laminate engineered for EMI and RFI shielding of electronic components, providing signal attenuation of 95 dB at 100 MHz. Supplied without adhesive or liner, the 0.0025″ laminate delivers a dielectric strength of 8,800 volts, tensile strength of 14,500 P.S.I., and elongation at break of 90%. Its unsupported construction makes it well suited for applications where a self-contained shielding layer is required rather than a pressure-sensitive tape.
Key Properties
- Signal Attenuation: 95 dB @ 100 MHz (ASTM D4935-99)
- Tensile Strength: 14,500 P.S.I. (ASTM-D-882)
- Elongation at Break: 90% (ASTM-D-882)
- Dielectric Strength: 8,800 volts (ASTM D149)
- Total Thickness: 0.0025″ +/- 10% (PSTC-33)
- Polyester Film Thickness: 0.002″
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Aluminum Foil Thickness | 0.00035″ | — |
| Polyester Film Thickness | 0.002″ | — |
| Total Thickness | 0.0025″ +/- 10% | PSTC-33 |
| Color | Silver | — |
| Shelf Life | 1 year @ 70°F(21°C)/50% R.H. | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength | 14,500 P.S.I. | ASTM-D-882 |
| Elongation at Break | 90% | ASTM-D-882 |
Electrical Properties
| Property | Value | Test Method |
| Signal Attenuation | 95 dB @ 100 MHz | ASTM D4935-99 |
| Dielectric Strength | 8,800 volts | ASTM D149 |
- EMI/RFI shielding for electronic enclosures
- Shielding of cable and connector assemblies
- Lamination into composite shielding constructions
- Shielding of PCB and component assemblies
- Electronics equipment shielding for aerospace and industrial systems
Common industries: Electronics manufacturing, aerospace, industrial equipment, telecommunications, and defense/military systems.
A-25 is an unsupported aluminum foil and polyester film laminate that steps up to a heavier 0.002″ polyester film layer, lifting its total thickness to 0.0025″ and its dielectric strength to 8,800 volts while retaining the same 95 dB @ 100 MHz signal attenuation shared across most of the A-Series line. This combination of higher dielectric margin and mid-range thickness suits it to applications needing a self-contained shielding layer with added insulation resistance.
The laminate is supplied in silver and carries a manufacturer-rated shelf life of one year when stored at 70°F (21°C) and 50% relative humidity. Its 14,500 P.S.I. tensile strength and 90% elongation at break give it strong conformability during slitting, die-cutting, and lamination into finished shielding assemblies.
What differentiates A-25 from other foil laminate grades in the A-Series line?
A-25 carries the same 95 dB @ 100 MHz signal attenuation found across most of the A-Series line, but its heavier 0.002" polyester film raises dielectric strength to 8,800 volts and elongation at break to 90% — a notable step up from the thinner A-10 NPS and A-15 NPS grades, giving it more insulation margin and conformability at a moderate 0.0025" thickness.
Why does tensile strength matter for A-25?
As an unsupported foil/film laminate with no adhesive backing, A-25's 14,500 P.S.I. tensile strength and 90% elongation at break allow it to be slit, die-cut, and laminated into finished assemblies without tearing the foil or delaminating the film during converting.
What is the storage range for A-25?
The manufacturer's TDS rates shelf life at 1 year when stored at 70°F (21°C) and 50% relative humidity. No separate operating temperature range is specified on the TDS.
Is A-25 suitable for FCC-regulated EMI/RFI shielding environments?
No — the manufacturer's TDS for A-25 does not state an FCC or any other compliance standard, so suitability for FCC-regulated programs would need to be independently verified.
How should A-25 be specified?
Specify grade (A-25), thickness, color, compliance requirements, dimensional tolerances, and finished format.
